Anterior Cruciate Ligament Return To Sport After Injury Research Articles

The Role of Strength-Related Factors on Psychological Readiness for Return to Sport Following Anterior Cruciate Ligament (ACL) Reconstruction.

Psychological readiness following anterior cruciate ligament reconstruction (ACLR) correlates with different return to sport outcomes. However, the relationship between strength and power and psychological readiness remains unexplored. The aim of this study was to investigate the relationship between anterior cruciate ligament return to sport after injury (ACL-RSI) scores and various hamstrings and quadriceps strength and power variables. Twelve participants (20.7 ± 2.5 years old; 174.2 ± 7.5 cm; 70.2 ± 8.5 kg; 18.2 ± 8.3% of body fat) who had an ACLR nine months or more before the study completed the ACL-RSI questionnaire and isokinetic strength testing of the hamstrings and quadriceps (60°·s-1 and 180°·s-1). Based on ACL-RSI scores, they were divided into "cases" and "controls", deemed not psychologically ready and psychologically ready to return to previous sport performance (PILOS), respectively. The main findings are that quadriceps' and hamstrings' rate of torque development (RTD) and time since surgery were determinants of psychological readiness following ACLR. Furthermore, compared to controls, cases showed significantly lower quadriceps torque at angles close to full knee extension (40 deg and 30 deg from extension). They also showed lower RTD than controls, but no difference in peak torque. These results suggest that physiotherapists should facilitate athletes' return to sport (RTS) by focusing on the restoration of RTD and strength at angles close to full knee extension.

Factors Associated With Sports Function and Psychological Readiness to Return to Sports at 12 Months After Anterior Cruciate Ligament Reconstruction: A Cross-sectional Study

Background: Sports function and psychological readiness to return to sports (RTS) are important outcomes when evaluating rehabilitation after anterior cruciate ligament reconstruction (ACLR). It is, however, unclear which specific factors contribute most to these outcomes. Purpose: To determine associations between demographic characteristics, objective measurements of physical function, patient-reported outcome measure scores, sports-related function assessed with the Knee injury and Osteoarthritis Outcome Score (KOOS) Sport and Recreation subscale, and psychological readiness to RTS assessed with the Anterior Cruciate Ligament–Return to Sport after Injury (ACL-RSI) scale at 1 year after ACLR. Study Design: Cross-sectional study; Level of evidence, 3. Methods: At a mean of 12.5 ± 2.0 months after ACLR, 143 participants (50.3% female), with a mean age of 25.0 ± 5.7 years, were assessed for demographic characteristics, physical factors (hop performance, muscle strength, ankle and hip range of motion), and psychological factors (KOOS Pain and Symptoms subscales, Perceived Stress Scale, fear of reinjury) as well as the KOOS Sport and Recreation subscale and ACL-RSI scale. Backward linear regression models were used to evaluate factors associated with sports function and psychological readiness to RTS. Results: Lower isokinetic knee extension peak torque (limb symmetry index) (B = 18.38 [95% CI, 3.01-33.75]), lower preinjury activity level (B = 2.00 [95% CI, 0.87-3.14]), greater knee pain (B = 0.90 [95% CI, 0.70-1.10]), shorter time between injury and reconstruction (B = 0.16 [95% CI, 0.05-0.26]), and greater fear of reinjury (B = 0.11 [95% CI, 0.01-0.20]) were associated with a worse KOOS Sport and Recreation subscore (R2 = 0.683). A shorter hop distance (B = 0.15 [95% CI, 0.00-0.29]) was associated with a lower ACL-RSI score (R2 = 0.245). Conclusion: A combination of knee muscle strength, activity level, knee pain, timing of surgery, and fear of reinjury accounted for approximately 70% of the variation in sports function at 1 year after ACLR. In contrast, there was only 1 weak association between physical function and psychological readiness to RTS at this time point. Thus, factors associated with current sports function are much better known than features related to psychological readiness to RTS.

Association of Psychological Readiness to Return to Sports With Subjective Level of Return at 12 Months After ACL Reconstruction.

Return-to-sports (RTS) rates after anterior cruciate ligament (ACL) reconstruction (ACLR) differ according to the level at which patients return. It is unclear whether the level of RTS is affected by psychological readiness to return. To examine the association between psychological readiness to RTS and subjective RTS level 12 months after ACLR. Case-control study; Level of evidence, 3. A total of 47 patients who underwent unilateral primary ACLR surgery were enrolled. Assessments at 6 and 12 months postoperatively consisted of knee strength testing (isokinetic quadriceps and hamstring strength), the International Knee Documentation Committee Subjective Knee Evaluation Form (IKDC-SKF), and the Anterior Cruciate Ligament-Return to Sport after Injury (ACL-RSI) scale to measure psychological readiness to RTS. Patients were assigned to 1 of 3 subgroups based on their subjective assessment of RTS level at 12 months postoperatively: RTS at or above preinjury level (RTS≥Pre; n = 19), RTS below preinjury level (RTS<Pre; n = 24), or no RTS (n = 4). Two-way mixed-model analysis of variance was used to examine the effects of RTS subgroup, postoperative time point, and group × time interaction with patient characteristics, knee strength, and IKDC-SKF and ACL-RSI scores. Multivariate logistic regression analysis was performed to determine which factors were associated with RTS subgroupings. Significant differences were found among the RTS≥Pre, RTS<Pre, and no-RTS groups in age, ACL-RSI score at 6 and 12 months, quadriceps strength at 6 and 12 months, and IKDC-SKF score at 6 and 12 months (P < .001 for all). Multivariate logistic regression analysis revealed that RTS at or above preinjury level was associated with higher ACL-RSI score at 12 months postoperatively (odds ratio [OR], 1.11; 95% CI, 1.05-1.20; P = .003) and younger age (OR, 0.80; 95% CI, 0.61-0.92; P = .012). The ACL-RSI score was significantly different among the study groups, and the ACL-RSI score at 12 months postoperatively and younger age were associated with RTS at or above preinjury level.

Validation of the ACL-RSI Scale in Pediatric and Adolescent Patients

Background: The Anterior Cruciate Ligament–Return to Sport after Injury (ACL-RSI) scale is a 12-item questionnaire assessing psychological readiness to return to sport after anterior cruciate ligament reconstruction. It has been validated for use in adults in multiple languages and in an abbreviated 6-question short form. Additionally, literature has been published using this scale in pediatric and adolescent populations, however it has not yet been validated for use with them. Purpose: To validate the ACL-RSI scale for use with pediatric and adolescent patients. Study Design: Cohort study (Diagnosis); Level of evidence, 2. Methods: Scores of 6- and 12-item ACL-RSI scales for patients undergoing return-to-sport readiness testing 6 to 8 months after anterior cruciate ligament reconstruction were analyzed. Convergent validity testing was performed against the International Knee Documentation Committee (IKDC)/Pediatric IKDC score, Single Assessment Numeric Evaluation (SANE) score, and peak torque asymmetry of knee flexion and extension using Spearman correlations. Discriminant validity testing was performed against age (Spearman correlation), body mass index (Spearman correlation), and sex (Mann-Whitney U test). Reliability testing was performed by calculating Cronbach’s alpha. Floor and ceiling effects were assessed by calculating the number of minimum and maximum scores in the cohort. Results: A total of 51 patients were included in the final analysis. The mean age at surgery was 15.2 ± 2.2 years, and 51.0% were female. The 6- and 12-item ACL-RSI scales demonstrated a strong significant positive correlation with IKDC/Pediatric IKDC scores (R = 0.723 and 0.717, respectively; P < .001) and moderate significant positive correlation with Single Assessment Numeric Evaluation scores (R = 0.516 and 0.502, respectively; P < .001) Age at surgery, body mass index, and sex were not correlated with either ACL-RSI scale. Cronbach’s alpha values of the 12- and 6-item ACL-RSI scales in this population were 0.959 and 0.897, respectively. For both the 12- and the 6-item ACL-RSI scales, no floor or ceiling effects were found as the minimum score (0) was not observed in either version, and the maximum score (100) was only observed twice (3.9%) in both versions. Conclusion: The ACL-RSI scale is valid to use with pediatric and adolescent patients. The 6-item scale may be a better choice because it has fewer redundancies and minimizes the risk of questionnaire fatigue.

The Association of Physical Competence With Psychological Response Among Young Athletes at Time of Return to Sport After ACL Reconstruction.

The traditional index of return-to-sport (RTS) readiness after anterior cruciate ligament reconstruction (ACLR) is the achievement of physical competence criteria. Emerging research indicates that psychological response and self-perceptions of physical competence may be critical mechanisms for successful RTS among young athletes. Young athletes with higher actual physical competence (APC) and perceived physical competence (PPC) will demonstrate a more positive psychological response at the time of RTS after ACLR. Cross-sectional study; Level of evidence, 3. A total of 41 young athletes after primary ACLR completed testing within 8 weeks of medical clearance to RTS. APC was measured with isokinetic knee extension strength, single-limb crossover hop for distance, and the Knee injury and Osteoarthritis Outcome Score. PPC was measured with the Athletic Competence subscale of the Self-Perception Profile. Criteria for APC and PPC were based on established age- and activity-relevant cutoff scores. Different constructs of psychological response were assessed with the adapted Sport Motivation Scale, Brief Resilience Scale, and Anterior Cruciate Ligament Return to Sport after Injury (ACL-RSI) total and subscale scores (Emotions, Confidence, and Risk Appraisal). Multiple linear regression analyses were used to determine differences in measures of psychological response based on achievement of APC and PPC, while adjusting for age and sex. Of the 41 participants, 10 (24.4%) met all criteria for APC and 22 (53.7%) met the PPC criteria. The regression models estimating the ACL-RSI score (P < .001; adjusted R2 = 0.331), ACL-RSI Emotions score (P < .001; adjusted R2 = 0.427), and ACL-RSI Risk Appraisal score (P = .013; adjusted R2 = 0.212) were statistically significant. Although APC was not associated with any measure of psychological response, meeting PPC criteria, younger age, and male sex were found to be associated with a more positive psychological readiness to RTS, but not with motivation or resilience. Meeting PPC criteria was associated with higher psychological readiness to RTS among young athletes after ACLR, while meeting APC criteria was not associated with any construct of psychological response.

Responsiveness of the Indonesian Versions of the Anterior Cruciate Ligament-Return to Sport After Injury Score, the International Knee Documentation Committee Subjective Knee Form, and the Lysholm Score in Patients With ACL Injury.

The Indonesian versions of the Anterior Cruciate Ligament-Return to Sport after Injury (ACL-RSI), International Knee Documentation Committee subjective knee form (IKDC), and the Lysholm scores are considered valid and reliable for Indonesian-speaking patients with anterior cruciate ligament (ACL) injury. The purpose of this study was to determine the responsiveness of the ACL-RSI, IKDC, and Lysholm scores in an Indonesian-speaking population with ACL injury. It was hypothesized that they would have good responsiveness. Cohort study (diagnosis); Level of evidence, 2. Between March 1, 2021, and February 28, 2022, patients with an ACL injury at a single hospital in Indonesia were asked to complete the ACL-RSI, IKDC, and Lysholm scores before either reconstruction surgery or nonoperative treatment. At 6 months after treatment, the patients completed all 3 scores a second time, plus a global rating of change question. The distribution-based and the anchor-based methods were used to study responsiveness. For each scale, the standardized response mean, minimal clinically important difference (MCID), and minimal detectable change (MDC; at the group [MDCgr] and individual [MDCind] levels) for each scale were determined. Of 80 eligible patients, 75 (93.8%) completed the study. The standardized response means for the ACL-RSI, IKDC, and Lysholm scores were 1.59, 1.72, and 1.51, respectively, indicating good responsiveness. The MCIDs for the ACL-RSI, IKDC, and Lysholm scores were 6.8, 7.8, and 4.8, respectively; all MCIDs were larger than that of the MDCgr (1.1, 0.7, and 0.6, respectively). At the individual level, the MCID for the IKDC was larger than the MDCind (7.8 vs 5.8). However, the MCIDs for ACL-RSI and Lysholm scores were smaller than those of the MDCind (6.8 vs 10.9 and 4.8 vs 5.1, respectively). The Indonesian ACL-RSI, IKDC, and Lysholm scores indicated good responsiveness and can be used in the follow-up of patients after ACL injury, especially at the group level. In individual patients, IKDC was found to be more efficient than the ACL-RSI or Lysholm scores for detecting clinically important changes over time after ACL treatment.

Clinical outcomes of arthroscopic partial resection of mucoid degeneration of anterior cruciate ligament.

Mucoid degeneration of the anterior cruciate ligament is rare condition; mucoid degeneration affects the range of motion of the knee with pain on terminal extension and terminal flexion. Arthroscopic treatment of the mucoid anterior cruciate ligament (ACL) is the treatment of choice. The purpose of this study was to provide demographic and clinical characteristic of mucoid degeneration of ACL and assess the outcomes of partial arthroscopic ACL resection. Patients who underwent partial ACL resection for mucoid degeneration between February 2007 and February 2019 were considered for study eligibility. Patients were evaluated for International Knee Documentation Committee (IKDC), The Anterior Cruciate Ligament Return to Sport After Injury (ACL-RSI), The Knee injury and Osteoarthritis Outcome Score (KOOS) and Tegner activity scale. Sixty patients underwent partial ACL resection for mucoid degeneration of the ACL. Nine patients were lost to follow-up, 43 were males, the average age was 52.12±12.09 and a mean follow-up of 83.55±44.79 months. At final follow-up six patients underwent ACL reconstruction for ACL rupture (11.7%) at an average of 15.66±12 months. Patient satisfaction was at 71%. Arthroscopic partial resection of the ACL led to good clinical outcome for treating mucoid degeneration of the ACL.

Poster 330: Quadriceps Autograft Leads to Improved Psychological Readiness for Return to Play Compared to Hamstring and Bone-Patellar Tendon-Bone Autografts Following ACL Reconstruction

Poster 330: Quadriceps Autograft Leads to Improved Psychological Readiness for Return to Play Compared to Hamstring and Bone-Patellar Tendon-Bone Autografts Following ACL Reconstruction

Poster 323: Factors Impacting Return to Sport Timing Following ACL Reconstruction

Objectives: Forty-one percent of sports injuries are knee injuries. One-fifth of knee injuries involve the anterior cruciate ligament (ACL). The high incidence of ACL injuries results in approximately 129,000 ACL reconstructions in the United States each year. Timing of return to sport (RTS) after ACL reconstruction (ACLR) depends on clearance by the medical team, patients meeting objective RTS criteria, and patient selected timing. A criterion-based approach to RTS commonly includes measurements of quadriceps strength, hop performance, and subjective knee function to guide the decision-making of orthopedic surgeons and physical therapists regarding patient readiness and safety to RTS. Therefore, the purpose of this study was to assess patient-related predictors (age, sex, graft type, psychological readiness, and the duration of physical therapy) of time to pass RTS criteria. We hypothesized that patients with more positive psychological readiness, those who were still completing physical therapy, and male patients would pass RTS testing at earlier time points, while graft type and age would have no effect. Methods: Fifty-four participants between the ages of 10 and 25 years and within 5 to 15 months of ACL reconstruction who were planning to return to at least 50 hours per year of cutting and pivoting activities were included. Patients with a previous history of surgery to either knee or concomitant posterior cruciate ligament reconstruction were excluded from the study. Participants completed clinic testing when RTS was being planned. Testing included unilateral quadriceps strength in each limb (isometric at 90° knee flexion using a crane scale and 1-repetition maximum using a knee extension machine), 4 single-legged hop tests (single, crossover and triple hop for distance; 6-meter timed hop), and self-reported knee function (International Knee Documentation Committee Subjective Knee Form 2000 [IKDC], Global Rating Scale). In order to pass, participants needed scores of at least 90% symmetry for both quadriceps strength measures and all 4 single-legged hop tests as well as 90% on the IKDC and Global Rating Scale. Participants repeated clinic testing until they passed the entire testing battery in a single session. On the day of passing all RTS criteria, psychological readiness was assessed using the ACL Return to Sport after Injury (ACL-RSI) survey. The ACL-RSI is a valid and reliable outcome tool that assesses the participant’s emotional wellbeing, confidence in performance, and risk appraisal. An additional survey question was used to identify if participants were still participating in physical therapy (PT) at the time of passing RTS testing or when they had finished working with a physical therapist. PT was categorized as either a) &lt;6 months of PT, b) 6-8 months of PT, or c) &gt;8 months of PT or still currently in PT. Multivariate linear regression was used to assess the association between age, sex, graft type, ACL-RSI score, and duration of PT on the time to passing RTS testing after ACL reconstruction. An alpha level of p&lt;0.05 was set a priori. Results: The mean age of the participants in this study was 17.3±2.7 years and 50% were female. Graft type and duration of physical therapy data are presented in Table 1. The mean time for passing all components of the RTS test battery was 10.3 ±2.6 months. At the time of passing RTS testing, the mean ACL-RSI score was 86.1±14.2%. Age, sex, graft type, ACL-RSI scores and duration of PT accounted for 44.5% of the variation in the time to pass RTS testing (p&lt;0.001). Sex (β=-0.426; p&lt;0.001), graft type (β=0.340; p=0.008), and age (β=0.194; p=0.111) were the strongest predictors of time to pass RTS testing with younger age correlating with shorter RTS times. Sex (Male: 8.6±3.1 months; Female: 11.1±3.5 months) and graft type (Hamstring: 7.7± 3.9 months; Quadriceps Tendon: 10.8±2.7 months; Patellar Tendon: 11.5±2.6 months; Allografts and IT band: 7.2±1.4 months), were significant predictors of time to pass RTS criteria while PT duration and ACL-RSI were not significant predictors. Conclusions: Female patients and patients with a patellar tendon or quadriceps graft took longer to meet objective RTS criteria after ACL reconstruction. Education with female patients and those with quadriceps and patellar tendon autografts may be required to establish realistic expectations for RTS readiness. While many factors impact graft choice, time to pass RTS criteria is an additional consideration for surgeons and patients. Additionally, previous studies have shown that male patients are more likely to experience graft retear following ACLR than females. This finding could be the result of male patients returning to sport earlier than females, giving the graft less time to heal. [Table: see text]

Paper 40: Early Clinical Outcomes Following Anterior Cruciate Ligament Reconstruction with Quadriceps Tendon Autograft in an Adolescent Population Suggest Higher Rates of Arthrofibrosis with Bone-Block than All Soft Tissue.

Objectives: There is an increased interest in quadriceps tendon autograft for anterior cruciate ligament (ACL) reconstruction in the adolescent population. It has emerged as a promising graft option that can be harvested with a bone-block (BB) or all soft tissue (AST). The preferred quadriceps graft remains controversial as there is evidence that bone to bone healing is stronger and faster, while AST grafts reportedly have a lower complication rate. The purpose of this study is to report early clinical outcomes following ACL reconstruction with BB versus AST quadriceps autograft in adolescent population. We hypothesized that both techniques would provide similar early clinical outcomes. Methods: A retrospective case-controlled study of patients under 20 years of age who underwent arthroscopic ACL reconstruction utilizing quadriceps tendon autograft from September 2017 to September 2021 was conducted. The cohort was divided in two groups: Group 1 included 35 patients who underwent ACL reconstruction with BB quadriceps tendon autograft. Group 2 included 58 patients who underwent ACL reconstruction with AST quadriceps tendon autograft. Data collected included demographics, range of motion, graft measurements, concomitant procedures, perioperative complications and arthrofibrosis rate, defined as reoperation for lysis of adhesions. Knee strength was objectively recorded at 3 months postoperatively using an isokinetic dynamometer (Humac, CSMI USA, Stoughton, MA, USA) and was used to calculate the Limb Symmetry Index (LSI), or the ratio between the involved limb and uninvolved limb and expressed as a percentage. Patient reported outcomes include International Knee Documentation Committee (IKDC) and Anterior Cruciate Ligament Return to Sport After Injury (ACL-RSI) scale. Statistical analyses were then performed to compare groups. Results: A total of 93 patients were included for analysis, with mean age of 15.9 (range 10-20) and mean follow-up 17 months (ranged from 3 to 25). There was no difference between the study and control groups regarding age (p=0.10), BMI (p=0.70), concomitant procedures (p=0.39), but there was a predominance in females in group 1 (bone block) (64.9% vs 43.3%, p=0.02). The group 1(bone block) was associated with higher rate of arthrofibrosis with odds ratio of 3.98 (7/35 20% vs 3/58 5%, p=0.02) and lower LSI (55.6% vs 68.4%, p=0.01) at 3 months postoperatively. Group 1 (bone block) grafts were overall greater in femur width (9.47 vs 9.19, p=0.02), and length (69.85 vs 65.12, p=0.01). Logistic regression found BB quadriceps tendon graft (p=0.03) and extension deficit at 3 months postoperatively (p=0.01) the only risk factors for arthrofibrosis. Patients in group 1 (bone block) reported lower outcomes scores than group 2 (all soft tissue), measured by IKDC 63.94 vs 75.27 (p=0.01) and (ACL-RSI) 49.55 vs 63.25 (p=0.01) at 3 months postoperatively. Conclusions: Comparative analysis between bone block and all soft tissue quadriceps tendon autograft for ACL reconstruction in an adolescent population demonstrates that bone block QT autograft is associated with 4 times higher rate of arthrofibrosis requiring operative intervention for lysis of adhesions. If surgeons opted for a bone block QT autograft for ACL reconstruction in the adolescent population, our findings suggest that an early rehabilitation program with a focus on early restoration of full knee extension should be implemented in order to avoid arthrofibrosis.

Differences in psychological readiness for return to sport after anterior cruciate ligament injury is evident in thigh musculature motor unit characteristics

BackgroundFollowing anterior cruciate ligament (ACL) injury, many athletes that undergo surgery and 6–9 months of rehabilitation struggle to return to sport. Evidence suggests that psychological factors contribute to this failure...

Poster 340: Return to Sport and Psychological Readiness to Return to Sport in Individuals who Have Undergone Bilateral vs Unilateral ACL Surgeries

Objectives: Prior studies report lower return to preinjury level of sport in patients who undergo bilateral anterior cruciate ligament (ACL) reconstructions compared to unilateral reconstructions, with the most common cited reason being fear of reinjury. The purpose of our investigation was to compare subsequent return rates and psychological readiness to return to sport (RTS) in patients who underwent bilateral versus unilateral ACL reconstructions. Methods: A retrospective review of patients who underwent ACL reconstruction at a single academic institution between 2012-2021 with a minimum of 1-year follow-up was conducted. Patients were divided into bilateral and unilateral cohorts. Those who underwent bilateral ACL reconstruction were matched 1:3 to unilateral reconstruction based on age, sex, BMI, and primary sport. Primary outcomes included return to sport, level of RTS and psychological readiness to RTS, assessed by the validated ACL- Return to Sport after Injury (ACL-RSI) scale. Within the ACL-RSI questionnaire, fear and confidence to return to sport were specifically analyzed. Fear to RTS was measured on a scale of 0-100 with 0 equal to extremely fearful and 100 equal to no fear at all. Confidence to RTS was measured on a scale of 0-100 with 0 equal to not at all confidence and 100 equal to fully confident. Statistical analysis was performed in R studio, with chi-square used for categorical values and two-sided t-test for continuous. Results: One hundred eighty-one patients were included, forty-three bilateral ACL reconstructions and one hundred thirty-eight unilateral. The unilateral cohort included 69 (50.0%) males and 69 (50.0%) females and the bilateral cohort included 22 (51.2%) males and 21 (48.8%) females. Mean age was 26.0 (14-56) in the unilateral cohort and 25.2 (14-50) in the bilateral cohort. Mean BMI was 25 (15.3-39.2) in the unilateral cohort and 28 (15.1-39.7[SM1] ) in the bilateral cohorts (p=.08). The percentage of individuals who returned to sport in the bilateral reconstruction cohort was not significantly different from those who returned in the unilateral cohort (79.6% vs 76.7%, p=0.85). There was no significant difference in psychological readiness to RTS (mean score 52.6 for bilateral and 47.4 for unilateral, p=0.31). There was also no significant difference between the level at which bilateral versus unilateral patients returned to sport. 59.6% unilateral returned to the same or higher level and 60.6% bilateral returned to the same or higher level, p=0.92. There was no significant difference in the reported scale of psychological readiness to return to sport (52.6 for bilateral and 47.4 for unilateral, p=0.31). When asked about fear to RTS, the mean scale response was 42.2 in the unilateral cohort and 46.5 in the bilateral (p=0.45). Conclusions: There is no difference in RTS and level of sport returned to between patients who undergo bilateral ACL reconstructions compared to patients who undergo unilateral ACL reconstructions. Psychological readiness, fear and confidence to return to sport were not different between unilateral and bilateral injuries.

Poster 347: PSYCHOLOGICAL READINESS AFTER REVISION ACL RECONSTRUCTION: A ROAR STUDY

Objectives: Background: Revision ACL reconstruction (ACLR) has demonstrated worse functional outcomes and higher reinjury rates in young patients. Psychological associations with revision surgery have not previously been evaluated. Purpose: To investigate levels of psychological readiness and psychological stress in young patients after revision ACLR Methods: Patients, ages 10-35, were enrolled who underwent revision ACLR at one center by one of six surgeons. Psychological readiness and psychological stress was assessed 6-months post- operatively with the Anterior Cruciate Ligament Return to Sport After Injury (ACL-RSI) and PROMIS- Psychological Stress Experiences (PROMIS-PSE), respectively. The International Knee Documentation Committee (IKDC/Pedi-IKDC), and Hospital for Special Surgery Pediatric Functional Activity Scale (HSS Pedi-FABS) were also collected. Patient reported outcomes of revision ACLR patients were compared to a cohort of primary ACLR patients. Propensity score matching 3:1 was performed for age, sex, and graft type. Results: Matching resulted in 81 ACLR patients (57 primary and 24 revision). Mean age in the revision group was 18.6 ± 3.2 (66.7% female). The most common graft type in both the primary and revision group was BTB (65% and 67%, respectively) (Table 1). Mild negative correlation was detected between IKDC and PROMIS PSE (r=-0.31; 95% CI=-0.49, -0.10; p=0.005) and a moderate positive correlation was detected between IKDC and ACL-RSI scores (r=0.56; 95% CI=0.39, 0.70; p&lt;0.001). Revision ACLR patients had lower psychological readiness scores (47 vs. 64, p=0.004) and lower IKDC/Pedi-IKDC scores (72 vs 78, p=0.05), compared to primary ACLR patients. Revision ACLR patients also had longer return to sports clearance compared to primary ACLR (median, 10 months vs 8 months; p=0.02). Regression analysis showed revision patients could expect a 15-point decrease in ACL RSI scores compared to patients who underwent primary ACLR surgery (95% CI=-25.30, -4.21; p=0.007). Furthermore, revision patients also could expect a 1.4 month longer return to sports clearance date compared to primary ACLR patients (95% CI=0.29, 2.60; p=0.01). No differences were noted in Pedi- FABS or PROMIS-PSE scores between revision and primary patients (Table 2). Conclusions: This study is the first to date to examine psychological readiness to return to sport in young patients after revision ACLR. At 6-months post-surgery, revision ACLR patients had lower psychological readiness scores, inferior knee functional outcomes scores, and delayed return to sport clearance. Greater attention to the psychological aspects of recovery in the revision ACLR setting may be important to help optimize post-operative care and outcomes. [Table: see text][Table: see text]

Preserving the Semitendinosus Distal Attachment Is Associated With Improved Graft Remodeling After ACL Reconstruction

Background: The semitendinosus (ST) tendon can be used by itself as a graft for anterior cruciate ligament (ACL) reconstruction. An increasing number of these procedures are being done while preserving the ST's tibial attachment, but there are no data on the remodeling of an attached ST (aST) graft. Purpose: To compare graft remodeling on magnetic resonance imaging (MRI) scans at 1 year after ACL reconstruction between standard free ST graft and aST graft. Study design: Cohort study; Level of evidence, 3. Methods: This prospective study enrolled 180 patients who were undergoing ACL reconstruction: 90 with the ST graft and 90 with the aST graft. The analysis was performed 1 year after the surgery. The main endpoint was the signal-to-noise quotient (SNQ) on MRI scans (T1-weighted sequence). The secondary endpoints were tibial tunnel widening (TTW), graft maturation (Howell classification), retear rate, new surgery rate, Simple Knee Value, Lysholm score, International Knee Documentation Committee (IKDC) score, postoperative Tegner score, difference between pre- and postoperative Tegner scores, ACL–Return to Sport after Injury (ACL-RSI), return-to-sports rate, and time to return to sports. Results: The mean adjusted SNQ was 1.18 (95% CI, 0.72-1.65) in the aST group and 3.88 (95% CI, 3.42-4.34) in the ST group (P < .001). The new surgery rate was 2.2% in the aST group and 10% in the ST group (P = .029). The median Lysholm score was significantly higher in the aST group (99; interquartile range [IQR], 95-100) than in the ST group (95; IQR, 91-99) (P = .004). The mean time to return to sports was significantly shorter in the aST group (248.73 ± 141.62 days) than the ST group (317.23 ± 144.69 days) (P = .002). No statistically significant difference was found between groups in the TTW (P = .503), Howell graft maturity grade (P = .149), retear rate (P > .999), Simple Knee Value (P = .061), postoperative Tegner score (P = .320), pre- to postoperative difference in Tegner score (P = .317), ACL-RSI (P = .097), IKDC score (P = .621), and return-to-sports rate (P > .999). Conclusion: At 1 year postoperatively, remodeling of an ST graft assessed using MRI is better when its distal attachment is left intact.

Translation, Validity, and Reliability of the Indonesian Version of the Anterior Cruciate Ligament-Return to Sport After Injury Scale.

The Anterior Cruciate Ligament-Return to Sport After Injury (ACL-RSI) scale measures athletes' emotion, confidence, and risk appraisal when returning to sports after an anterior cruciate ligament (ACL) injury and/or ACL reconstruction (ACLR). To translate the ACL-RSI into the Indonesian language and to assess its validity and reliability in Indonesian-speaking patients after ACLR. Cohort study (diagnosis); Level of evidence, 2. After a forward-and-backward translation procedure, the validity and reliability of the Indonesian version of the ACL-RSI (I-ACL-RSI) were investigated. Patients who had undergone ACLR at a single hospital were asked to complete 4 questionnaires: I-ACL-RSI, Injury-Psychological Readiness to Return to Sport, Tampa Scale of Kinesiophobia, and International Knee Documentation Committee. After a 2-week interval, patients were asked to complete the I-ACL-RSI a second time. Following the COSMIN reporting guidelines (Consensus-Based Standards for the Selection of Health Measurement Instruments), we determined construct validity using hypothesis testing, as well as test-retest reliability, internal consistency, floor and ceiling effects, and measurement error. Of 200 eligible patients, 102 (51%) were included in the analysis. All predefined hypotheses on correlations between the I-ACL-RSI and the other questionnaires were confirmed, indicating good construct validity. An intraclass correlation coefficient of 0.90 (2-way random, type agreement) was found for the first and second I-ACL-RSI scores, indicating good test-retest reliability. A Cronbach α of 0.95 indicated good internal consistency, and no floor or ceiling effects were found. The standard error of measurement was 3.9, with the minimal detectable change calculated as 10.9 points at the individual level and 1.1 points at the group level. Based on the study findings, the I-ACL-RSI can be considered a valid and reliable questionnaire for Indonesian-speaking patients after ACL injury and/or ACLR.

Performance in field-tests and dynamic knee valgus in soccer players psychologically ready and not ready to return to sports after ACL reconstruction

BackgroundThe objective was to compare the performance in field tests, dynamic knee valgus, knee function, and kinesiophobia of soccer players who were psychologically ready and not ready to return to unrestricted training or competitions after ACL reconstruction. MethodsThirty-five male soccer players who had undergone primary ACL reconstruction at least 6 months were divided based on the Anterior Cruciate Ligament Return to Sport after Injury (ACL-RSI) questionnaire score into ready (≥60) and not-ready (<60) groups. The modified Illinois change of direction test (MICODT) and reactive agility test (RAT) were used to impose the demand for directional change and reactive decision-making. We assessed the frontal plane knee projection angle (FPKPA) during a single-leg squat and distance in crossover hop test (CHD). In addition, we assessed kinesiophobia through the shortened version of the Tampa Scale of Kinesiophobia (TSK-11) and knee function using the International Knee Documentation Committee Subjective Knee Form (IKDC). Independent t-tests were used to compare the groups. ResultsThe not-ready group had lower performance on the MICODT (effect size (ES) = −1.2; p < 0.001) and RAT (ES = −1.1; p = 0.004) tests and higher FPKPA (ES = 1.5; p < 0.001). In addition, they presented lower IKDC (ES = 3.1; p < 0.001) and higher TSK-11 (ES = −3.3; p < 0.001) scores. ConclusionsPhysical and psychological deficits may persist in some individuals after rehabilitation. On-field tests and dynamic knee alignment evaluation should be included in the athlete evaluation before the decision-making about clearance to sports participation, especially in athletes who perceive themselves as psychologically not ready.

Drop Jump Performance Improves One Year Following Anterior Cruciate Ligament Reconstruction in Sportsmen Irrespectively of Psychological Patient Reported Outcomes

Our study aims to prospectively report the functional outcomes of 31 sportsmen following anterior cruciate ligament (ACL) reconstruction, up to 12 months after surgery, with regards to subjective tests and drop jump performance, and to investigate the correlations between these variables, to be used for determining the return to sports after ACL reconstruction. Lysholm score, Tegner activity level, and the ACL-Return to Sport after Injury (ACL-RSI) scale were evaluated preoperatively, at 6 months, and at 12 months after surgery. Drop vertical jump was recorded using an infrared optical acquisition system. Lysholm and ACL-RSI scores significantly improved at the 12-month follow-up compared to the baseline and 6-month evaluations (p < 0.001). Concerning Tegner activity level, no statistically significant differences were reported between pre- and post-operative status (p = 0.179). Drop jump limb symmetry index significantly improved at 12 months, with the mean value improving from 76.6% (SD: 32,4) pre-operatively to 90.2% (SD: 14.7; p < 0.001) at follow-up. Scarce positive correlation was reported between the ability to perform drop jumps and activity level in athletes one year after ACL reconstruction. In addition, subjective knee score and psychological readiness were not related to jumping performance.

Kinesiophobia Is Negatively Associated With Psychological Readiness to Return to Sport in Patients Awaiting Anterior Cruciate Ligament Reconstruction

To identify the factors associated with anterior cruciate ligament return to sport after injury (ACL-RSI) scores in patients awaiting ACL reconstruction (ACLR). This was a retrospective cross-sectional observational study conducted at a single clinical center. We recruited patients scheduled for primary ACLR, aged 16-45 years, and with modified Tegner activity scale scores ≥5 before ACL injury. The main outcome was psychological readiness to return to sport (RTS), as measured using the ACL-RSI scale. Participants' personal and injury-related information were obtained, and their psychological status (Tampa Scale for Kinesiophobia [TSK] and athletic identity measurement scale) and knee functions (effusion, range of motion, joint stability, and knee flexion angle during a single-leg squat) were examined. All variables were assessed the day before the surgery. A total of 105 patients (median [interquartile range]: age, 20.0 [9.0] years; body mass index, 22.8 [4.3] kg/m2; days from injury to surgery, 63.0 [65.0] days; 44% female) were enrolled. Univariate analysis indicated that only the TSK score was associated with the ACL-RSI scores (r=-0.305; P= .02). Multiple regression analysis of factors, including sex, preinjury Tegner activity scale score, and days from injury to surgery, further showed that only the TSK score was associated with the ACL-RSI scores (P= .002; 95% confidence interval-1.738 to-0.394). In patients awaiting ACLR, kinesiophobia was moderately negatively associated with psychological readiness to RTS, while other factors were not. Level III, retrospective cross-sectional observational study.

Quadriceps strength and psychological readiness are associated with multiplanar knee kinematics after anterior cruciate ligament reconstruction

BackgroundGait asymmetry, negative psychological factors and quadriceps strength deficits are common after anterior cruciate ligament reconstruction (ACLR). Whether quadriceps strength and psychological factors have impacts on multiplanar knee kinematics remains unclear. Research questionWhat are the relationships of multiplanar knee kinematics during the gait cycle and psychological readiness to quadriceps strength after ACLR? MethodIn total, 45 patients were enrolled in this study at 8.3 ± 1.5 months after ACLR. All patients underwent gait analysis and isokinetic testing. Interlimb differences in the range of motion (ROM) and maximum and initial contact (IC) angles in abduction-adduction, flexion-extension, and internal-external rotation were calculated. The limb symmetry index (LSI) for quadriceps strength was calculated. Psychological readiness was measured using the Anterior Cruciate Ligament Return to Sport After Injury (ACL-RSI) scale. The paired t test analyzed the differences between contralateral and affected limbs in quadriceps and hamstrings strength. Pearson or Spearman correlation was used to assess relationships between the variables of interest. ResultsSignificant differences between contralateral and affected limbs were observed in isokinetic knee quadriceps strength (P < 0.001) and hamstring strength (P = 0.009). The ACL-RSI score correlated negatively with interlimb differences in the knee flexion angle at IC (r = –0.35, P = 0.02) and ROM in the transverse plane (r = –0.41, P = 0.003). The LSI for quadriceps strength correlated negatively with the peak knee flexion angle (r = –0.37, P = 0.02) and positively with the ACL-RSI score (r = 0.3, P = 0.05). SignificanceGreater psychological readiness and quadriceps strength are associated with more symmetrical multiplanar knee kinematics. The improvement of these parameters may aid the recovery of knee kinematics after ACLR, and reduce the rate of reinjury and incidence of posttraumatic osteoarthritis.

Age-, Sex-, and Graft-Specific Reference Values From 783 Adolescent Patients at 5 to 7 Months After ACL Reconstruction: IKDC, Pedi-IKDC, KOOS, ACL-RSI, Single-Leg Hop, and Thigh Strength.

OBJECTIVE: To describe age-, sex-, and graft source-specific reference values for patient-reported, physical function, and strength outcome measures in adolescents at 5 to 7 months after anterior cruciate ligament reconstruction. DESIGN: Cross-sectional study. METHODS: Data were collected at 3 universities and 2 children's hospitals. The participants completed at least one of the International Knee Documentation Committee (IKDC) Subjective Evaluation Form, Pediatric IKDC (Pedi-IKDC), Knee Injury and Osteoarthritis Outcomes Score (KOOS), and Anterior Cruciate Ligament Return to Sport After Injury (ACL-RSI) Scale. Participants also completed single-leg hop tests and/or isokinetic quadriceps and hamstrings strength assessments (at 60°/s). Reference values were summarized using descriptive statistics and stratified for age, sex, and graft source. RESULTS: Reference values were reported for common patient-reported outcomes and measures of physical function and strength from 783 participants (56% females, age = 16. 4 ± 2.0 years) who were in early adolescence (12-14 years, N = 183, 52% females), middle adolescence (15-17 years, N = 456, 58% females), or late adolescence (18-20 years, N = 144, 55% females). Three hundred seventy-nine participants (48.4%) received a bone-patellar tendon-bone autograft, 292 participants (37.3%) received hamstring tendon autograft, and 112 participants (14.3%) received autograft or allograft from an alternative source. CONCLUSION: Reference values for common patient-reported outcomes and measures of physical function and strength differed depending on a patient's age, sex, and graft source. Using patient-specific reference values, in addition to previously described age-appropriate cutoff values, may help clinicians monitor and progress patients through rehabilitation and return to physical activity after anterior cruciate ligament reconstruction. J Orthop Sports Phys Ther 2023;53(4):1-8. Epub: 23 January 2023. doi:10.2519/jospt.2023.11389.