Acetabular Dysplasia Research Articles

Triple Pelvic Osteotomy for Hip Dysplasia: The Akbulut-Coskun Technique Using a Modified Stoppa Approach.

Many successful osteotomies have been reported for the treatment of acetabular dysplasia. However, triple pelvic osteotomy remains a technically challenging procedure with potential for significant complications. This study examined a series of Tönnis periacetabular osteotomy (TPAO) procedures performed using the modified Stoppa approach to treat acetabular dysplasia in adolescents. To describe the radiographic outcomes, complications, and early functional results of TPAO using the modified Stoppa approach for acetabular dysplasia in adolescents. This study included 16 patients (20 hips) who underwent TPAO using the modified Stoppa approach for symptomatic acetabular dysplasia. The characteristics of the patients and the surgical procedure were discussed. The radiologic outcome was evaluated using the lateral center-edge (CE) and Tönnis roof angles. Perioperative data including surgery duration, blood loss, and complications were recorded. Complications were also discussed. The mean age of the patients was 11.5±1.1 (10 to 13) years. The mean preoperative anteroposterior CE angle was 14.7±3 degrees (7 to 19 degrees), and the mean postoperative angle was 35.7±3.1 degrees (30 to 42 degrees; P<0.001). The mean preoperative Sharp's angle was 55.9±5.4 degrees (48 to 65 degrees), and the postoperative mean was 33±5 degrees (24 to 40 degrees; P<0.001). The mean Tönnis angle before and after osteotomy was 23.3±7.1 degrees (17 to 36 degrees) and 7.1±2 degrees (4 to 10 degrees), respectively (P<0.001). The mean operative time was 42.2±10.3 minutes with a mean blood loss of 167.7±50.3mL. One patient sustained a bladder injury as a major complication. The use of TPAO with the intrapelvic modified Stoppa approach in the treatment of hip dysplasia provides the benefits of a single incision, access to 2 hips in the same session, positional advantage, and abductor function preservation. Early results are satisfactory and safe. Level IV.

Radiographs Underestimate Lateral Center Edge Angle and Tonnis Angle Measurements Compared to CT Scan in Assessment of Borderline and Frank Acetabular Dysplasia

Radiographs Underestimate Lateral Center Edge Angle and Tonnis Angle Measurements Compared to CT Scan in Assessment of Borderline and Frank Acetabular Dysplasia

A Process Evaluation in a Randomized Controlled Trial among Adults with Acetabular Dysplasia

Abstract Introduction The 2021 framework from the UK’s Medical Research Council defines evaluation as a theory-driven approach to examine how well an intervention works. However, the application of these guidelines can be challenging. Therefore, using a process evaluation case study on an exercise and patient education intervention for adults with acetabular dysplasia, we reflect on which specific aspects were relevant for the evaluation of the intervention and why. We focus on detailing methods to assess implementation (process, dose, reach), acceptability, mechanisms of change, and the impact of contextual factors. Methods Two hundred trial participants aged 18-50 years will be recruited from a University Hospital in Denmark and randomised to intervention and control groups. The process evaluation adopts a concurrent mixed-methods design involving self-report questionnaires at baseline and 6-month follow-up, training records and semi-structured focus groups with intervention providers (n = 10) and healthcare managers (n = 4-6). The mechanisms of change will be explored through semi-structured one-to-one interviews (at baseline and 6-month follow-up) with 15-20 purposefully sampled trial participants, and additionally, through exploratory examinations of associations between dose and change in health outcomes at 6-month follow-up), via simple linear regression models. The acceptability and contextual factors will be explored through one-to-one participant interviews, plus focus groups with 4-6 healthcare managers. Thematic analyses of the interviews will focus on expectations, experiences, events, personal understandings and interpersonal and organisational interactions. Conclusions The presentation will explore how the operational aspects of the intervention can be assessed through a process evaluation and how these findings may improve and expand any future implementation efforts.

Functional and radiological outcomes and complications of bernese periacetabular osteotomy through modified Stoppa approach.

The Smith-Peterson approach and its modifications provide an extensive exposure and allow osteotomies through a single incision. However, the risk of complications increases when the quadrilateral surface, ischial and pubic osteotomy sites cannot be seen. This study aimed to evaluate the surgical characteristics, complications, and functional and radiological outcomes of patients with acetabular dysplasia who underwent Bernese periacetabular osteotomy (PAO) through modified Stoppa approach and plate-screw fixation. The study included 31 patients (41 hips) who had undergone PAO using a modified Stoppa approach. The characteristics of patients and the surgical procedure were described. The lateral centre-edge angle (LCEA) and Tönnis roof angle were evaluated in the radiological outcome evaluation. The modified Harris Hip Score (mHHS) was used to evaluate functional outcome. Furthermore, complications were described. The mean age of the patients was 20.4 ± 9.0 years. Of the 31 patients, 21 underwent unilateral Bernese PAO and 10 underwent bilateral Bernese PAO. The mean follow-up period was 25.1 ± 8.8 months. Postoperatively, the mean mHHS improved significantly (68.8 ± 9.4 vs. 88.8 ± 10.0, p < 0.001). Postoperatively, the mean LCEA and Tönnis roof angle improved significantly (17.7 ± 6.0 vs. 42.2 ± 4.8, p < 0.001 for LCEA and 18.3 ± 5.5 vs. 8.0 ± 2.2, p < 0.001 for Tönnis roof angle). There was no significant correlation between preoperative to postoperative improvement in LCEA or Tönnis roof angle and improvement and mHHS (p > 0.005). 5 complications were identified: 1 transient sciatic nerve palsy, 1 external iliac vein injury, 1 infection, and 2 screw irritations of acetabulum. Performing Bernese PAO through a modified Stoppa approach with plate-screw fixation results in acceptable complication rates, immediate early weight-bearing opportunity, and improved functional and radiological outcomes in patients with acetabular dysplasia.

Outcomes of open reduction for hip dislocations in children with connective tissue disorders.

While children with hypermobility and/or ligamentous laxity due to coexisting connective tissue disorders might be expected to have worse outcomes after open reduction for hip dislocations, there is minimal prior research on this topic. All open reduction surgeries for hip dislocations performed at a single urban, tertiary-care children's hospital from 2009 to 2023 were reviewed retrospectively. Those with connective tissue disorders secondary to a diagnosed syndrome or genetic disorder were included. Patients with <1 year of follow-up or hip instability in the setting of Trisomy 21 were excluded. Clinical and radiographic data was collected. Instances of re-dislocation, proximal femoral growth disturbance, residual acetabular dysplasia, and arthrofibrosis were recorded. Twenty-three hips (15 patients) were included. Mean age at the time of surgery was 19.6 months (Range: 8.2-36.0 months), and mean follow-up was 4.3 years. The most common connective tissue disorder condition included was Ehlers-Danlos syndrome (13%). A majority of open reductions were performed via an anterior approach (96%). Seven hips (30%) underwent a concomitant pelvic osteotomy without femoral osteotomy and seven hips (30%) underwent both pelvic and femoral osteotomies. Twenty-two hips (96%) were International Hip Dysplasia Institute grade 1 at the final follow-up. Re-dislocation occurred in four hips (17%); eight hips (35%) demonstrated residual acetabular dysplasia, five hips (22%) demonstrated proximal femoral growth disturbance, and nine hips (39%) developed stiffness postoperatively. Patients with connective tissue disorders and ligamentous laxity have comparable rates of residual acetabular dysplasia, proximal femoral growth disturbance, and (surprisingly) stiffness as typical developmental dysplasia of the hip following open hip reduction surgery. Although the re-dislocation rate in the connective tissue disorders group was approximately 2-3 times higher, the difference did not reach statistical significance. Given that the study was limited by a low sample size, however, it is possible that the findings of no difference in residual acetabular dysplasia and proximal femoral growth disturbance were potentially due to a lack of power. IV.

Using 2D U-Net convolutional neural networks for automatic acetabular and proximal femur segmentation of hip MRI images and morphological quantification: a preliminary study in DDH

BackgroundDevelopmental dysplasia of the hip (DDH) is a common pediatric orthopedic condition characterized by varying degrees of acetabular dysplasia and hip dislocation. Current 2D imaging methods often fail to provide sufficient anatomical detail for effective treatment planning, leading to higher rates of misdiagnosis and missed diagnoses. MRI, with its advantages of being radiation-free, multi-planar, and containing more anatomical information, can provide the crucial morphological and volumetric data needed to evaluate DDH. However, manual techniques for measuring parameters like the center–edge angle (CEA) and acetabular index (AI) are time-consuming. Automating these processes is essential for accurate clinical assessments and personalized treatment strategies.MethodsThis study employed a U-Net-based CNN model to automate the segmentation of hip MRI images in children. The segmentation process was validated using a leave-one-out method during training. Subsequently, the segmented hip joint images were utilized in clinical settings to perform automated measurements of key angles: AI, femoral neck angle (FNA), and CEA. This automated approach aimed to replace manual measurements and provide an objective reference for clinical assessments.ResultsThe U-Net-based network demonstrates high effectiveness in hip segmentation compared to manual radiologist segmentations. In test data, it achieves average DSC values of 0.9109 (acetabulum) and 0.9244 (proximal femur), with a 91.76% segmentation success rate. The average ASD values are 0.3160 mm (acetabulum) and 0.6395 mm (proximal femur) in test data, with Ground Truth (GT) edge points and predicted segmentation maps having a mean distance of less than 1 mm. Using automated segmentation models for clinical hip angle measurements (CEA, AI, FNA) shows no statistical difference compared to manual measurements (p > 0.05).ConclusionUtilizing U-Net-based image segmentation and automated measurement of morphological parameters significantly enhances the accuracy and efficiency of DDH assessment. These methods improve precision in automatic measurements and provide an objective basis for clinical diagnosis and treatment of DDH.

Seasonal variation in newborn hip dysplasia: Unraveling the impact of weather on hip development

BackgroundBabies born in winter have greater incidence of developmental dysplasia of the hip (DDH) and related surgeries. How weather conditions impact hip development and how screening program reacts weather issue remain unknown. This study tests a hypothesis that winter born babies have more newborn acetabular dysplasia and laxity that is responsible of later DDH. MethodsRetrospective data from newborns who had hip ultrasonography in the first 3 days of life were analyzed. The Graf type IIc, III, IV (shallow acetabulum) and type D (laxity) were classified as abnormal. The association and risks of an abnormal hip were analyzed with gender, gestational age, fetal presentation, parity and external temperature of birth month and the last 3 months before birth using the Pearson chi-square test and logistic regression. ResultsA total of 10962 newborns participated in hip ultrasound exams voluntarily in nurseries from 2016 to 2022. Distribution of babies with Graf type I, IIa, IIc, D, III/IV hips were 88.8%, 10%, 0.5%, 0.6%, and 0.1%, respectively. Female was the most significant factor for congenital shallow acetabulum (3.8x) and hip laxity (4x) compared to male (p <0.001). Preterm babies had a borderline lower risk of abnormal hips (0.4x, p = 0.05). Winter season is not associated with newborn abnormal hips (p = 0.36, statistical power = 80%), but a positive correlation was noted between external temperature and incidence of abnormal hips (r = 0.62, p = 0.03). Cold weather does not have a direct internal effect in acetabular dysplasia or hip laxity at birth. ConclusionsBabies who were born in winter were not associated with acetabular dysplasia and hip laxity at birth but had greater risks of late-diagnosed DDH and surgeries. The postnatal effects from weather should be addressed by a public awareness campaign, and hip screening may not be limited on the neonatal stage. Level of evidencelevel III, diagnostic

Reliability of Radiologic Classifications of Sequelae of Septic Arthritis of the Hip in Children.

To the best of our knowledge, there is no study comparing the inter and intraobserver reliability of current classifications for postseptic hip sequelae in children. The current study aims to assess the interobserver and intraobserver reliability of four current classifications and identify hips that could not be classified in each classification system. The hip radiographs of 148 consecutive children with sequelae of sepsis of the hip from 2 centers were assessed after a minimum of 2 years of follow-up after sepsis. All hips (affected and normal sides) were classified according to the 4 original descriptions of the authors of the respective classifications. If a hip did not fall into any subtype of the classification, the rater was asked to mark it as nonclassifiable and state the reason for being unable to classify the hip in the respective classification. The intraclass correlation coefficient was computed to assess the reproducibility of each classification. Interrater reliability and intrarater reliability were moderate (0.57 to 0.72) while including all hips. The reliability was poor (0.35 to 0.49) in all 4 classifications, with an evaluation of only affected 180 hips. A few sequelae of infection, including caput valgus (n = 7), acetabular dysplasia (4), joint space narrowing (2), and bony ankylosis (1), were not included in any of the 4 current existing classification systems. The reliability of all current classifications of sequelae of septic arthritis of the hip is moderate. A proportion of sequelae do not find a place in all current classifications. Level III.

Rehabilitation following periacetabular osteotomy for acetabular dysplasia: A qualitative interview study exploring challenges, hopes, and expectations among patients in Denmark and Australia

Rehabilitation following periacetabular osteotomy for acetabular dysplasia: A qualitative interview study exploring challenges, hopes, and expectations among patients in Denmark and Australia

Three-dimensional acetabular reorientation during periacetabular osteotomy: an intraoperative navigation method using an external fixator for periacetabular osteotomy.

Bernese periacetabular osteotomy (PAO) is an effective procedure for treating acetabular dysplasia. However, limited visual control of the acetabular position during surgery may result in under- or overcorrection or changes in acetabular version resulting in residual dysplasia or femoroacetabular impingement. Thus, we wanted to develop a simple and straightforward navigation method that provides information about acetabular correction in all three planes during surgery. Intraoperatively, acetabular coordinates are shown in coronal, sagittal, and transverse plane by two perpendicular tubes of an external fixator mounted onto a third tube that is fixed to the mobilized acetabular fragment with two Schanz screws. The application and fixation of the external fixator on the pelvis are demonstrated in this article. We used this analog navigation method on 27 PAOs, where we mainly performed a lateral rotational correction. The pre- and postoperative radiographs of these 27 hips were analyzed regarding the radiological hip parameters, taking into account the pelvic tilt. The mean preoperative lateral center edge angle (LCEA) of the 27 PAOs improved from 16° (+-6) to a mean of 34° (+-6°) and the mean acetabular index (AI) was corrected from 15° (+-4) to 2° (+-4). This implements highly physiologic postoperative values for lateral coverage in this population. In this case series, no postoperative acetabular retroversion was measured in any of the 27 PAOs. Three-dimensional control of the acetabular orientation during periacetabular osteotomy is important to avoid over- and undercorrection. Using a fixateur externe as an analog navigation method this three-dimensional control can be implemented intraoperatively for PAOs.

Prognosticating Residual Dysplasia at Skeletal Maturity Following Closed Reduction for Developmental Dysplasia of the Hip: A Long-Term Study with an Average 20-Year Follow-up.

Patients with developmental dysplasia of the hip (DDH) are at risk for residual acetabular dysplasia even after successful closed reduction. The aim of this study was to identify predictors of long-term outcomes in order to guide prognostication and management. Patients who were treated for DDH at 2 institutions between 1970 and 2010 and had follow-up until skeletal maturity were screened for inclusion. Hips that underwent open reduction were excluded to reduce iatrogenic confounding. Syndromal (including neuromuscular and arthrogrypotic) hip instability with collagenopathies were excluded. Demographic characteristics, Tönnis grade, age at the time of the reduction, surgical treatment, acetabular index, lateral center-edge angle, residual dysplasia graded using the Severin classification, and the presence and type of proximal femoral growth disturbance categorized using the Bucholz and Ogden classification were assessed. In addition, the the acetabular angle was recorded at the latest follow-up before secondary procedures, and the Oxford Hip Score and 5-level EuroQoL (EQ)-5 Dimension score were recorded at the latest follow-up. To account for repeated measures, generalized estimating equations (GEE) logistic regression was utilized for the multivariable analysis. A support vector machine model and a receiver operating characteristic curve analysis were utilized to identify prognostication thresholds. One hundred and seven hips (96 female, 11 male) that were followed to skeletal maturity, with a mean follow-up of 20 years (range, 10 to 54 years), were included in the analysis. Eighty-nine hips (83%) demonstrated a good outcome at skeletal maturity, with a Severin grade of I or II. Major growth disturbances of Bucholz and Ogden types II, III, or IV were present in 13 hips (12%). At the latest follow-up after skeletal maturity (before any secondary procedures), the mean acetabular angle was 45° ± 4° and the mean lateral center-edge angle was 26° ± 8°. The mean Oxford Hip Score and EQ visual analog scale values were 47 and 86, respectively. A GEE logistic regression analysis of 1,135 observations revealed that the acetabular index (odds ratio [OR], 1.16 per degree; p < 0.001) and age (OR, 1.20 per year; p = 0.003) were significant predictors of a poor outcome (i.e., Severin grade III, IV, or V). Significant differences in acetabular indices across all age groups were found between hips with a good outcome and those with a poor outcome. Age-specific acetabular index prognostication cutoff values are presented. This long-term follow-up study demonstrated that the age-specific acetabular index remains an important predictor of residual dysplasia at skeletal maturity. The proposed prognostication chart and thresholds herein can help to guide orthopaedic surgeons and parents when contemplating the use of an intervention versus surveillance to optimize long-term outcomes. Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Evaluation of the thickness of acetabular cartilage by ultrasound in developmental dysplasia of the hip.

It has been reported that the cartilaginous roof of the acetabulum is thicker in infants with developmental dysplasia of the hip (DDH) than in those with healthy hips. However, there is limited research on the changes in the thickness of acetabular cartilage after follow-up or treatment of DDH. This study aims to report the thickness of acetabular cartilage before and after treatment of DDH. In this prospective study, infants with clinical suspicion of DDH were enrolled in the pediatric outpatient service in our hospital from January 2022 to August 2023. The thickness of acetabular cartilage was measured in the standard coronal plane. Borderline hips (Graf IIa type) were monitored with monthly ultrasound examination until they were classified as normal hips (Graf I type), while dysplastic hips (Graf IIb type or worse) were treated with the Pavlik harness until they were also classified as normal hips in the final ultrasound examination. A total of 592 children [median age, 96 days (interquartile range, 70-142 days); 197 boys] were enrolled in the study. The thickness of acetabular cartilage in dysplastic hips (4.3 ± 1.6 mm) was greater than that in normal hips (3.0 ± .39 mm, P < 0.001) and borderline hips (3.1 ± .57 mm, P < 0.001). In borderline hips, the thickness of acetabular cartilage decreased from 3.1 ± .57 mm in the initial evaluation to 2.9 ± .53 mm in the final follow-up scan (P = 0.01). In dysplastic hips, the thickness of acetabular cartilage decreased from 4.3 ± 1.6 mm in the initial evaluation to 3.5 ± .51 mm after treatment (P = 0.003). The thickness of acetabular cartilage in dysplastic hips after treatment remained greater than that in normal hips (P < 0.0001). The thickness of acetabular cartilage decreased after follow-up or treatment of DDH. Further research is required to determine whether cartilage that remain thicker in dysplastic hips than that in normal hips after treatment should be considered an early indicator of residual acetabular dysplasia.

Patients Undergoing Hip Arthroscopy With Concomitant Periacetabular Osteotomy Demonstrate Clinically Meaningful Improvement at 2 Years Using the Patient-Reported Outcome Measurement Information System and International Hip Outcome Tool 12

PurposeTo report the minimal clinically important difference (MCID) and substantial clinical benefit (SCB) values using the Patient-Reported Outcome Measurement Information System (PROMIS) and International Hip Outcome Tool 12 (iHOT-12) in patients undergoing hip arthroscopy (HA) with concomitant periacetabular osteotomy (PAO), HA+PAO for acetabular dysplasia and intra-articular pathology with minimum 2-year follow up. MethodsData from patients who underwent HA+PAO was prospectively collected and retrospectively analyzed. Inclusion criteria consisted of patients who had a diagnosis of hip dysplasia or hip instability and had minimum 2-year PROMs follow up. Data was collected electronically preoperatively and postoperatively at 6 months, 1year, and 2 years. Outcome measures analyzed were the iHOT -12 and PROMIS computer adaptive tests (CAT): Physical Function (PF), Pain Interference (PI), and Global Physical Health (GPH). MCID and SCB were calculated for these measures. Results106 patients were included in the study with an average age of 23.5 ± 6.6, an average body mass index (BMI) of 24.3, and the majority being female (94%). The values for MCID were calculated to be 40.9, 40.7, 60.2, and 43.5 and the percentage achieving MCID at 2 years was 82.6%, 82.9%, 79.6%, and 80.1% for the iHOT-12, PROMIS-PF, PROMIS-PI, and PROMIS-GPH respectively. The 1 year and 2-year SCB scores for ≥ 80% satisfaction and percent achieving were as follows respectively: iHOT-12 (71.8 (60.3%), 61.9 (65.1%)); PROMIS-PF (47.1 (64.2%), 47.2 (71.7%)); PROMIS-PI (50.6 (48.1%), 52.3 (49.1%)); PROMIS-GPH (49.3 (54.7%), 49.3 (55.7%)). The 1 year and 2 year SCB scores for 100% satisfaction and percent achieving were as follows respectively: iHOT-12 (80.2 (44.3%), 81.3 (47.2%)); PROMIS-PF (50.7 (46.2%), 50.3 (56.6%)); PROMIS-PI (52.4 (34.9%), 52.4 (49.1%)); PROMIS-GPH (52.5 (36.8%), 49.3 (55.7%)). ConclusionThis study reports values for MCID and SCB for PROMIS and iHOT-12 at 2-year follow up in patients undergoing HA+PAO for hip dysplasia or instability. The percentage of patients achieving MCID ranged from 79.6%-82.9% at 2-year follow-up. In addition, the percentage of patients achieving SCB at 2-year follow up for ≥ 80% satisfaction ranged from 49.1%-71.2% and the percentage for 100% satisfaction ranged from 49.1%-56.6%

Addressing Extra-Articular Impingement in the Athlete

Extra-articular impingement (EAI) is an atypical, infrequent source of hip pain. Unlike femoroacetabular impingement (FAI) and acetabular dysplasia (AD), EAI results from abnormal contact of the proximal femur and trochanteric region, and the ischium or subspine areas. Hip pain and potential instability are reported. Causes of EAI include a narrowed ischiofemoral space, coxa valga, femoral torsion abnormalities, avulsion malunions, and more complex deformities resulting from pediatric hip diseases. Unique history and examination findings not commonly seen with standard FAI are noted, including pain with standing and hip extension and imbalanced hip motion with excessive internal rotation and limited external rotation (or vice versa). Surgical indications are yet to be definitively defined, but surgical treatment options include lesser trochanter resection, femoral osteotomy, and surgical hip dislocation. Proper workup and surgical planning have demonstrated good outcomes for treatment of EAI with these techniques, but information to optimally define which patients benefit most from which surgeries is pending.

Exploring the Experiences and Expectations of Adolescent Females Undergoing Periacetabular Osteotomy.

Adolescents presenting with symptomatic acetabular dysplasia (AD) complain of pain and reduced participation in activities of daily living (ADLs). Periacetabular osteotomy (PAO) is widely accepted as the preferred treatment for AD. Understanding the patient experience can lead to improvements in psychosocial and physical burden in adolescents. We sought to explore the experiences and expectations of adolescent females with AD who underwent a PAO. We conducted semistructured interviews with adolescent females who underwent a PAO >6 months ago. Questions focused on exploring their experiences with AD and their PAO expectations and decision-making. Participants also completed a 7-item Likert-scale questionnaire related to factors they considered in their decision-making, which was followed by a ranking of those considerations. We utilized an inductive and deductive coding approach to identify key themes from interviews and descriptively analyzed questionnaire responses. Eighteen adolescent females between 13 and 19 years (17.2±1.9y) at the time of PAO participated in the study. Time from surgery to interview ranged from 203 to 1534 days (927.7±320.8d). Key themes included (1) prolonged time from symptom onset to PAO, with many seeing several providers; (2) major preoperative apprehensions of surgical outcome and setbacks in school and recreational activities; (3) discussion with the physician and people who underwent PAO were the most beneficial sources of information; (4) Postoperative worries include surgical outcome and return to daily living. Eighty-nine percent of participants reported that return to daily activities and sustaining long-term hip health were very important factors in their PAO decision-making, and 61% ranked their return to daily activities as their top priority. Adolescent females with AD report frustrating delays in diagnosis and appropriate intervention and value their return to daily living in their decision to undergo PAO. The development of future patient-centered interventions may improve the PAO decision-making process and should include information related to surgical recovery and anecdotes of others who underwent this procedure. Level IV, therapeutic study.

Endoscopic Shelf Acetabuloplasty Combined With Hip Arthroscopic Labral Repair, Cam Osteoplasty, and Capsular Plication Enables Elite Athletes With Acetabular Dysplasia to Return to Sport: A Case Series.

To investigate clinical outcomes and return to sport timeline for athletes with acetabular dysplasia after endoscopic shelf acetabuloplasty (ESA). A retrospective review. Wakamatsu Hospital of the University of Occupational and Environmental Health, Japan between 2012 and 2019. Fifteen elite athletes (median age: 20 years) of 253 patients undergoing ESA, arthroscopic labral repair/reconstruction, cam osteochondroplasty, and capsular plication. The mean follow-up period was 27.8 months after surgery. Patient-reported outcome scales (PROSs), including the modified Harris Hip Score, Nonarthritic Hip Score, International Hip Outcome Tool 12, Hip Outcome Score-Sports, and Vail Hip Score. After ESA, all 15 elite athletes were able to return to sport effectively and compete at a preoperative level. The mean time between the operation and the first practice was 6.5 months, while the mean time between the ESA procedure and the first game was 9.6 months. Approximately 27.8 months after surgery, PROS outcomes improved significantly with no hips requiring emergency revision surgery at the final follow-up. At a mean of 47.1 months after surgery, 7 athletes decided to retire from their sport. Up to 71.1 months after surgery, the additional 8 patients continued to compete in their sport at an elite level. ESA enables elite athletes with acetabular dysplasia to return to competition at a mean of 9.6 months postsurgery. The ESA procedure is an effective and promising method of treating elite athletes with acetabular dysplasia. IV.

FEMORAL HEAD REDUCTION OSTEOTOMY APPROACH FOR SEVERE PROXIMAL FEMUR DEFORMITIES: SURGICAL TECHNIQUE AND MINIMUM TWO-YEAR RESULTS

Executing an extended retinacular flap containing the blood supply for the femoral head, reduction osteotomy (FHO) can be performed, increasing the potential of correction of complex hip morphologies. The aim of this study was to analyse the safety of the procedure and report the clinical and radiographic results in skeletally mature patients with a minimum follow up of two years.Twelve symptomatic patients (12 hips) with a mean age of 17 years underwent FHO using surgical hip dislocation and an extended soft tissue flap. Radiographs and magnetic resonance imaging producing radial cuts (MRI) were obtained before surgery and radiographs after surgery to evaluate articular congruency, cartilage damage and morphologic parameters. Clinical functional evaluation was done using the Non-Arthritic Hip Score (NAHS), the Hip Outcome Score (HOS), and the modified Harris Hip Score (mHHS).After surgery, at the latest follow-up no symptomatic avascular necrosis was observed and all osteotomies healed without complications. Femoral head size index improved from 120 ± 10% to 100 ± 10% (p&lt;0,05). Femoral head sphericity index improved from 71 ± 10% before surgery to 91 ± 7% after surgery (p&lt;0,05). Femoral head extrusion index improved from 37 ± 17% to 5 ± 6% (p&lt; 0,05). Twenty five percent of patients had an intact Shenton line before surgery. After surgery this percentage was 75% (p&lt;0,05). The NAHS score improved from a mean of 41 ± 18 to 69 ± 9 points after surgery (p&lt; 0,05). The HOS score improve from 56 ± 24 to 83 ± 17 points after surgery (p&lt; 0,05) and the mHHS score improved from 46 ± 15 before surgery to 76 ± 13 points after surgery (p&lt; 0,05).In this series, femoral head osteotomy could be considered as safe procedure with considerable potential to correct hip deformities and improve patients reported outcome measures (PROMS).Level of evidence - Level IV, therapeutic studyKeywords - Femoral head osteotomy, Perthes disease, acetabular dysplasia, coxa plana

Can acetabular dysplasia be measured on axial CT? A measurement for trauma surgeons

BackgroundAcetabular dysplasia has been theorized as a risk factor instability amongst common acetabular fractures, such as posterior wall (PW) fractures. However, common radiographic measurements often cannot be acquired in trauma patients. We evaluated axial computed tomography (CT) scans to identify novel, easily-obtained measurements that correlate with acetabular dysplasia for use in surgical indications and planning. MethodsPatients with known acetabular dysplasia undergoing elective periacetabular osteotomy were selected. A different group of patients without pelvic ring or acetabular fractures from an institutional trauma registry were selected as a comparison group. Standard indices of dysplasia were collected, such as center-edge angle (CEA). Acetabular geometric measurements were taken at three axial levels: 0 – cranial CT slice at the dome; 1 – cranial CT where the dome is an incomplete circle; 2 – cranial CT with femoral head visible. Distances between levels were also calculated: Levels 0–1 (Dome Height; DH), Levels 1–2 (Head Height; HH), and Dome-Head Difference (DH – HH = DHD). ResultsDH, HH, and DHD were all significantly correlated with CEA, Tonnis angle, and Sharp's angle in dysplastic hips. All dysplastic hips had DH ≤ 2.5 mm and HH ≥ 1.25 mm. DHD ≤ 0 mm was most specific (93.6 % sensitive, 77.3 % specific) for predicting dysplasia. ConclusionDH ≤ 2.5 mm, HH ≥ 1.25 mm, and DHD ≤ 0 mm were independently associated with dysplasia on axial CT scans. These measurements may be quickly and easily used by trauma surgeons to assess a trauma-based axial CT scan for acetabular dysplasia.

Development of an aid to detect adults acetabular hip dysplasia (the ALPHA alert): A mixed methods study

ObjectivesTo identify the signs and symptoms that people living with acetabular hip dysplasia (AHD) describe and to provide an aid for translating the findings into practice. MethodsA three-phased mixed methods study. Phase 1 employed an open-question online survey that enabled people with AHD (aged ≥16 years) to describe features associated with their condition. Responses were thematically analysed. A Phase 2 survey used these themes to establish how common those features were. Phase 3 created a mnemonic that prompts clinicians to suspect AHD. ResultsNinety-eight respondents completed Phase 1 and sixty-two completed Phase 2. From the responses, five themes were identified: Demographic and Diagnostic Profile; Characteristics of Posture and Gait; Pain; Childhood Hip and Family History; and Hip Joint Characteristics. Within these themes, 19 common signs and symptoms were reported, represented by the ALPHA mnemonic. ALPHA describes a young age at onset of problems (Age), a limp (Limp), progressing pain (Pain), a history of childhood and family hip anomalies (History) as well as hip joint hypermobility and instability (Articulation). ConclusionThe findings extend current understanding of AHD indicators. ALPHA alerts clinicians to suspect a diagnosis of AHD. ALPHA may facilitate timelier referral of patients for diagnostic X-Ray and appropriate treatment. Future studies should evaluate its clinical utility.

Radiological predictors of outcomes in hip arthroscopy for femoroacetabular impingement.

Hip arthroscopy has gained prominence as a primary surgical intervention for symptomatic femoroacetabular impingement (FAI). This study aimed to identify radiological features, and their combinations, that predict the outcome of hip arthroscopy for FAI. A prognostic cross-sectional cohort study was conducted involving patients from a single centre who underwent hip arthroscopy between January 2013 and April 2021. Radiological metrics measured on conventional radiographs and magnetic resonance arthrography were systematically assessed. The study analyzed the relationship between these metrics and complication rates, revision rates, and patient-reported outcomes. Out of 810 identified hip arthroscopies, 359 hips were included in the study. Radiological risk factors associated with unsatisfactory outcomes after cam resection included a dysplastic posterior wall, Tönnis grade 2 or higher, and over-correction of the α angle. The presence of acetabular retroversion and dysplasia were also significant predictors for worse surgical outcomes. Notably, over-correction of both cam and pincer deformities resulted in poorer outcomes than under-correction. We recommend caution in performing hip arthroscopy in patients who have three positive acetabular retroversion signs. Acetabular dysplasia with a lateral centre-edge angle of less than 20° should not be treated with isolated hip arthroscopy. Acetabular rim-trimming should be avoided in patients with borderline dysplasia, and care should be taken to avoid over-correction of a cam deformity and/or pincer deformity.