Achilles Injury Research Articles

Traction Sural Neuropathy From Acute Achilles Injury: A Case Report

Traction Sural Neuropathy From Acute Achilles Injury: A Case Report

Evaluation of Surgical Reconstruction of Old Tendo Achilles Injury by Bosworth Technique

Background: Chronic Achilles tendon rupture in the watershed hypovascular region (zone II) makes end-to-end repair less feasible. Bosworth's technique, involving gastrocnemius-soleus turndown, was studied to determine its efficacy and functional outcome in repairing chronic tendon in zone II. Objective: To evaluate surgical reconstruction of old Tendo Achilles injury by Bosworth technique. Methods: This prospective study was carried out in Dhaka Medical College Hospital (DMCH) form July 2006 to December 2007. 20 cases were selected as non-randomized purposive sampling technique who came to the out patients department of DMCH. All cases were diagnosed as old neglected Tendo Achilles injury and treated by surgical reconstruction by Bosworth technique. Two cases were lost from follow up and discarded from the study. Finally the study was done on 18 patients. Results: The mean age of the patients was 31.7 years and the lowest and highest cases were 17 and 47 years respectively. The male female ratio was 5:1. One-third (33.3%) patients were day labourer, 22.2% service holders, 16.7% house wives and the rest 27.8% students. Two-Third of the patients (67%) had involvement of left Tendo Achilles and the rest (33%) had right Tendo Achilles. Nearly 40% of patients’ injury was caused by the overhanging edge of the toilet Pan, 27.8% by traumatic rupture, 11.1% assaulted by sharp weapon, another 11.1% by sharp edge of a metallic plate, 5.6% accidentally by sharp cutting knife and 5.5% by broken glass. The mediun level of injury was 3.5 cm above from the insertion of Tendo Achilles, while the lowest and highest level were 2.5 and 6 cm. Minimum delay from injury to operation was 6 weeks and maximum 32 weeks. 5 patients (27.8%) gained normal range of ankle movement, 6 patients (33.3%) decreased by 5° of unaffected side, 4 (22.2%) by 10° and 3 (16.7%) by more than 10⁰. Mean power of planter flexion, mean calf width and mean score to stand on tip toe on injured side relative ........

Does high-intensity running to fatigue influence lower limb injury risk?

ObjectivesThe aim of this study was to quantify changes in peak bending moments at the distal tibia, peak patellofemoral joint contact forces and peak Achilles tendon forces during a high-intensity run to fatigue at middle-distance speed. DesignObservational study. Methods16 high-level runners (7 female) ran on a treadmill at the final speed achieved during a preceding maximum oxygen uptake test until failure (~3 min). Three-dimensional kinetics and kinematics were used to derive and compare tibial bending moments, patellofemoral joint contact forces and Achilles tendon forces at the start, 33 %, 67 % and the end of the run. ResultsAverage running speed was 5.7 (0.4) m·s−1. There was a decrease in peak tibial bending moments (−6.8 %, p = 0.004) from the start to the end of the run, driven by a decrease in peak bending moments due to muscular forces (−6.5 %, p = 0.001), whilst there was no difference in peak bending moments due to joint reaction forces. There was an increase in peak patellofemoral joint forces (+8.9 %, p = 0.026) from the start to the end of the run, but a decrease in peak Achilles tendon forces (−9.1 %, p < 0.001). ConclusionsRunning at a fixed, high-intensity speed to failure led to reduced tibial bending moments and Achilles tendon forces, and increased patellofemoral joint forces. Thus, the altered neuromechanics of high-intensity running to fatigue may increase patellofemoral joint injury risk, but may not be a mechanism for tibial or Achilles tendon overuse injury development.

A Research and Clinical Framework for Understanding Achilles Injury in Female Collegiate Gymnasts - ERRATUM.

A Research and Clinical Framework for Understanding Achilles Injury in Female Collegiate Gymnasts - ERRATUM.

Pdgfrβ+ Lineage Cells Transiently Increase at the Site of Achilles Tendon Healing.

The purpose of this study was to track platelet-derived growth factor receptor-beta (Pdgfr-β) lineage cells at the site of Achilles tendon injury over time. Pdgfr-β-CreERT2 :Ai9 mice were generated in order to track Pdgfr-β lineage cells in adult mice. A surgical Achilles transection injury model was employed to examine the presence of Pdgfr-β lineage cells in the healing tendon over time, with 5 mice per time point at 3, 7, 14, 28, and 56 days postoperatively. Histology and immunohistochemistry for tdTomato (Pdgfr-β lineage cells), PCNA (proliferating cell nuclear antigen, cell proliferation), and α-SMA (alpha smooth muscle actin, myofibroblasts) were performed. The percentage of cells at the healing tendon site staining positive for tdTomato and PCNA were quantified. Over 75% of cells at the injury site were Pdgfr-β lineage cells at days 3, 7, and 14, and this percentage decreased significantly by days 28 and 56 post-injury. Cell proliferation at the injury site peaked on day 7 and decreased thereafter. Immunohistochemistry for α-SMA demonstrated minimal co-localization of myofibroblasts with Pdgfr-β lineage cells. This study demonstrates that in a mouse model of Achilles tendon injury, Pdgfr-β lineage cells' presence at the injury site is transient. Thus, we conclude that they are unlikely to be the cells that differentiate into myofibroblasts and directly contribute to tendon fibrous scar formation. This article is protected by copyright. All rights reserved.

Insulin-Functionalized Bioactive Fiber Matrices with Bone Marrow-Derived Stem Cells in Rat Achilles Tendon Regeneration.

Approximately half of annual musculoskeletal injuries in the US involve tendon tears. The naturally hypocellular and hypovascular tendon environment makes tendons injury-prone and heal slowly. Tendon tissue engineering strategies often use biomimetic scaffolds combined with bioactive factors and/or cells to enhance healing. FDA-approved growth factors to promote tendon healing are lacking, which highlights the need for safe and effective bioactive factors. Our previous work evaluated insulin as a bioactive factor and identified an optimal dose to promote in vitro mesenchymal stem cell survival, division, and tenogenesis. The present work evaluates the ability of insulin-functionalized electrospun nanofiber matrices with or without mesenchymal stem cells to enhance tendon repair in a rat Achilles injury model. Electrospun nanofiber matrices were functionalized with insulin, cultured with or without mesenchymal stem cells, and sutured to transected Achilles tendons in rats. We analyzed rat tendons 4 and 8 weeks after surgery for the tendon morphology, collagen production, and mechanical properties. Bioactive insulin-functionalized fiber matrices with mesenchymal stem cells resulted in significantly increased collagen I and III at 4 and 8 weeks postsurgery. Additionally, these matrices supported highly aligned collagen fibrils in the regenerated tendon tissue at 8 weeks. However, treatment- and control-regenerated tissues had similar tensile properties at 8 weeks, which were less than that of the native Achilles tendon. Our preliminary results establish the benefits of insulin-functionalized fiber matrices in promoting higher levels of collagen synthesis and alignment needed for functional recovery of tendon repair.

Achilles Tendon Tears in Adolescents and Young Adults

Background:Achilles tendon tears are rare in adolescents and young adults, and management of these injuries remains controversial.Hypothesis/Purpose:To describe long-term limitations and physical activity levels following full or partial Achilles tears in adolescents and young adults, and report rates of surgical management, complications, re-tears, and time to return to sports (RTS).Methods:We conducted a descriptive study of young patients (8-22 years old) who were treated for a partial or full Achilles tear at two pediatric hospitals between 2004-2018. Demographic, imaging, and treatment data were retrospectively collected. Patient reported outcomes were obtained including the Achilles Tendon Total Rupture Score (ATRS), Foot and Ankle Outcomes Score (FAOS), Tegner Activity Scale (TAS), and separate questions about reinjury and return to sport.Results:Of the 41 eligible patients with Achilles injuries, 25 (61%; mean age 18.9 years; 40% male) had a minimum one year of follow-up data and were further analyzed. Twenty-three patients (92%) underwent surgical repair. Twenty patients (80%) returned questionnaires at a median 6.3 years (IQR, 3.4 to 9.7 years), while the other 5 patients were followed for a median of 1.8 years (IQR, 1.1 to 2.5 years). Twenty-two (88%) injuries were full tears, 53% (10/19) with reported location occurring mid-tendon. Median ATRS score was 96 (IQR, 82-100) and median TAS score was 6 (4-8). Median FAOS scores were excellent for symptoms (91), pain (100), ADL (100), and sports (98), and were good for QOL (88). The 6-month RTS probability was 47% (95% CI, 19-66%) and at 12 months was 95% (65-99%). The median time to RTS for partial tears was 5.6 months vs. 6.6 months for full tears (p=0.05). One surgical patient (4%) had a retear which required revision repair while 2 others needed additional surgery (1 - arthroscopy for ankle impingement, 1 - surgery for haglund’s deformity). In addition to the 3 surgical patients requiring re-operation, 8 patients experienced other complications (11/25 total complications, 44%), which included minor wound/scar complications (4), scar formation necessitating hydrodissection (1), Achilles tendonitis (2), and persistent pain following conservative treatment leading to surgical repair (1). Females were more likely to experience a complication (9/15, 60%) compared to males (2/10, 20%), but this difference was not statistically significant (p=0.10).Conclusion:Adolescents and young adults surgically treated for an Achilles injury reported satisfactory long-term outcomes.

Single Biotenodesis Screw vs Biotenodesis Screw with Cortical Button Tension Slide Technique for Flexor Hallucis Longus Transfer: A Biomechanical Analysis

Category:Ankle; Hindfoot; Sports; OtherIntroduction/Purpose:Restoration of functional plantarflexion of the ankle joint following chronic Achilles injury is achieved through transfer of the flexor hallucis longus (FHL) tendon. Fixation of the FHL tendon transfer with a cortical button tension slide technique is an advancement that has not been measured against traditional methods. The purpose of this study is to evaluate the biomechanical differences between a single biotenodesis screw versus biotenodesis screw with cortical button tension slide technique for the fixation of FHL transfer. The authors hypothesize a biomechanical advantage for the tension slide technique compared to the biotenodesis screw alone for fixation of the flexor hallucis longus in chronic Achilles pathology.Methods:12 pairs (n=24) of fresh-frozen cadaveric tibia-to-toe samples (6 male, 6 female) were utilized to assess the biomechanics of FHL tendon transfer fixation. All specimens underwent bone density analysis. Each pair of cadaveric samples were randomized to receive either the biotenodesis screw or the tension slide technique. FHL tendon transfer was performed via standard technique using a 6.25x15mm biotenodesis screw with the foot in 20 degrees plantarflexion. A 2.6x12mm cortical button was inserted and FHL tendon was introduced with a tension-slide technique. Biomechanical loading was applied between 20N and 60N at a rate of 1Hz for 100 cycles. Post-cyclic load to failure occurred at 1.25mm/sec. Cyclic displacement, structural stiffness, and ultimate load were derived from resultant load-displacement curves. Student t-tests were used to evaluate significant effects between both FHL tendon transfer techniques. Linear regression analysis was performed to assess interactions between bone density and strength of FHL tendon transfer.Results:Average tendon diameter of the 24 FHL samples was 5.44+-0.46 mm. Average bone density for all 24 calcaneus samples was determined to be 1.06+-0.08 g/cm2. Loading data was normalized with respect to bone density and tendon diameter to account for inherent anatomical differences between cadaveric specimens. The addition of a cortical button for FHL transfer to the calcaneus did not significantly affect cyclic displacement (0.78+-0.52mm vs 0.87+-0.80mm) or structural stiffness (162.11+- 43.34N/mm vs. 167.57+-49.19N/mm). Addition of the cortical button to the FHL tendon transfer construct resulted in a 34% significant increase in ultimate load (343.72+-68.93 N) compared to biotenodesis screw alone (255.62+-77.17 N) (p=0.0002). Linear regression analyses did not reveal any significant interactions between bone density and FHL tendon transfer technique.Conclusion:Enhanced strength can be achieved for Achilles pathology repaired with FHL tendon transfer utilizing a biotenodesis screw and cortical button tension slide technique demonstrated by a statistically significant 34% increase in ultimate load, subsequent to cyclic loading. Cortical buttons in the setting of FHL tendon transfer to the calcaneus offers an additional level of support in the case of extreme tendon transfer failure.

Factors Associated With Achilles Tendon Rupture in Women's Collegiate Gymnastics.

Achilles injury risk in women's collegiate gymnastics is 10-fold higher than in all other collegiate sports. This study aims to identify risk factors for Achilles tendon ruptures in collegiate female gymnasts. Gymnasts with Achilles tendon ruptures will be more likely to report early gymnastics specialization, elite-level training before college, and performance of high-difficulty skills on floor and vault. Cross-sectional study. Level 4. Anonymous surveys were distributed to current and former collegiate female gymnasts, aged 18 to 30 years, via coaches, athletic trainers, Twitter, and ResearchMatch. Information about Achilles tendon ruptures, gymnastics-related injuries, sport specialization, event/skills participation, and medication use were collected. A total of 581 gymnasts were included. One hundred gymnasts (17.2%; 95% CI: 14.1%-20.3%) reported Achilles tendon ruptures during collegiate training or competition. Most ruptures (91%) occurred on floor exercise; 85.7% of these occurred during back tumbling-take-off. Compared with gymnasts without ruptures during college, a greater percentage of gymnasts with ruptures competed at a Division I program, trained elite, competed difficult vaults and floor passes before and during college, competed in all 4 events during college, identified as Black/African American, and used retinoid medications. Achilles tendon ruptures are more common in women's collegiate gymnastics than other sports. Competing at the elite level, performing difficult floor and vault skills, and competing in all 4 events may increase the risk for an Achilles tendon rupture. Potential nontraining risk factors include retinoid exposure and Black/African American race. Future studies regarding the mechanisms of Achilles tendon ruptures in female collegiate gymnasts are warranted. Collegiate gymnasts who compete at the elite level, perform high levels of difficulty on floor and vault, and compete in all 4 events may be at increased risk for Achilles tendon ruptures.

Outcome of Primary Repair of Severed (Partial/ Complete) Tendoachilles

Rupture of the Achilles tendon was reportedly first described by Ambroise Pare in 1575 and was reported in the literature in 1633. After the 1920s the use of operative treatment increased, primarily because of reports by Abrahamsen in 1923 and Quenu and Stoianovitch in 1929 who advocated surgical repair, based on accumulated cases from the literature. In this series we used 5 parameters according to Juhana Leppilahti Modified scoring system to assess the final outcome of the patient functionally. These were stand on affected tip toe unsupported, range of motion of affected side ankle, power of planter flexion, calf muscle wasting and complications. These parameters were also used in various study described in various literature. So, early repair of open Tendo Achilles injury provided an effective outcome, which was comparable with the result described in others. The study was designed as a prospective cohort study conducted at Rajshahi Medical College Hospital from January 2017 to December 2017. Study was carried out on 50 patients hospital admitted with ruptured tendoachillis, irrespective of age and sex. Modified Kessler was the procedure as operative treatment for their disease. Outpatient follow-up was undertaken. In our study among 50 patients 38(76%) were male and 12(24%) were female. Mean age was 30.02 years with standard deviation of ± 7.7. Most of the cases were operated within 6 hours of injury. After final toileting wound swab was sent for culture sensitivity and found in 60% cases E. Coli, 6% Pseudomonas, 4% Klebshiela and in 30% cases no growth. Mean delay of repair was 6 hours 7 minutes, with standard deviation ± 2.362 minutes. In our study median level of cut was 3.0 cm proximal to the insertion of Tendo Achilles and where interquartile range was 2.5 to 3.5 cm. Mean follow up period was 9 months with standard deviation was 2.37. Ankle motion were normal in 35 cases (70%) and changes of motion were up to 6-10 degree in 13(26%) patients in this series, which was very much acceptable in comparison to above studies. Only 2(4%) patients had more than 10 degree motion restricted. Common complications were superficial skin infection 4 cases (37%), mild swelling 4 cases (36%), ugly scar 2 cases (18%) and wound gap 1 cases (9%). In our study no major complication occurred but minor complications like superficial skin infection, delayed wound healing occurred which were successfully managed with an oral antibiotic regimen with no long term sequelae. In this series we assessed fifty acute open Tendo Achilles injured patients after 16 weeks of treatment. Among them 90%(45) can stand on affected tip toes unsupported, around 4 cases (8%) cannot stand on tip toes of affected foot can’t support but able to stand on affected foot with unsupported. Around 2% (1 case) failed to stand on affected foot without support due to severe infection and wound gap. The final result was as followed excellent in 28 cases (56%), good in 16 cases (32%), fair in 4 cases (8%), poor in 2 cases (4%). In this study it was found that 85% satisfactory result among 50 patients of acute open tendo Achilles injured patients by immediate repair. If this procedure put in total population then satisfactory result was found in following confidence interval (at 5% level of significance). According to Juhana Leppilahti Modified Score at 95% Confidence Interval satisfactory outcome is 78.99% to 97.00%, which was comparable with the result described in others. Early repair of open Tendo Achilles complete or partial provided an effective outcome, which was comparable with the result described in others.

Achilles Injury and Access to Care in South Florida

Category:Hindfoot; AnkleIntroduction/Purpose:Achilles Tendon (AT) rupture is the most common tendon rupture in the lower extremity with an incidence of 2.1 AT ruptures per 100,000 person years. Due to the non-emergent nature of this injury, a delay in presentation may occur leading to delays in diagnosis and treatment; which may alter both nonoperative and operative management. Health insurance status may directly impact time to presentation for many patients. To our knowledge, no study has evaluated the effect of insurance status on delay in diagnosis and treatment of AT rupture.Methods:From December 2013 to December 2018, 89 patients with AT ruptures who underwent surgical management were identified by CPT code in a dual-institution retrospective chart analysis. Demographic and injury-specific data were obtained with attention to the date of injury, date of diagnosis, location of initial presentation (clinic vs. emergency room), and number of medical visits. A univariate two tail t test was used to compare various groups. Statistical significance was set at p < 0.05 to determine the effects of insurance type on the time to diagnosis and treatment of acute AT ruptures.Results:When compared to adequately insured patients (private and Medicare), underinsured patients (uninsured and Medicaid) experienced a significantly greater time from the date of: injury to first clinic visit (14.5 days versus 5.2 days, p < 0.001), first clinic visit to surgery (34.6 days versus 4.8 days, p < 0.002), injury to surgery date (48.9 days versus 9.8 days, p < 0.001), initial presentation to when magnetic resonance imaging (MRI) was obtained (48.1 days versus 1.9 days, p < 0.002), and initial presentation to diagnosis (22.8 days versus 1.71 days, p < 0.029).Conclusion:Disparities in access to care are intimately related to insurance status. Uninsured and medicaid patients are subject to institutional delays and decreased access to care when compared to patients with private insurance. Under and uninsured patients are significantly more likely to present to the emergency department for their initial visit, potentially resulting in increased healthcare costs. Emergency department visits as well as difficulty in obtaining an appointment with an orthopedic surgeon may directly contribute to delay in diagnosis.

Achilles Injury and Access to Care in South Florida.

Introduction. Despite the amount of orthopaedic research evaluating access to care based on insurance status, no study quantifies the effects of insurance status on the care of acute Achilles tendon ruptures. Methods. Using Current Procedural Terminology codes, we identified all patients who underwent surgical management of Achilles tendon rupture between December 31, 2013, and December 31, 2018, and followed-up at either a county hospital-based orthopaedic surgery clinic and/or private university-based clinic. Inclusion criteria included patients who (1) underwent surgical management of an Achilles tendon rupture during this time period and (2) were at least 18 years of age at the time of surgery. A univariate 2-tailed t test was used to compare various groups. Statistical significance was set at P < 0.05. Results. When compared to adequately insured patients (private and Medicare), underinsured patients (uninsured and Medicaid) experienced a significantly greater time from the date of injury to first clinic visit (14.5 days vs 5.2 days, P < .001), first clinic visit to surgery (34.6 days vs 4.8 days, P < .002), injury to surgery date (48.9 days vs 9.8 days, P < .001), initial presentation to when magnetic resonance imaging was obtained (48.1 days vs 1.9 days, P < .002). Conclusions. Disparities in access to care for Achilles tendon ruptures are intimately related to insurance status. Uninsured and Medicaid patients are subject to institutional delays and decreased access to care when compared to patients with private insurance.Levels of Evidence: Level III: Prognostic, retrospective.

Surgical Versus Nonsurgical Treatment for Acute Achilles Tendon Rupture A Systematic Review/Meta-Analysis

Abstract Background and Introduction Tendon Achilles injury affects 31.17 per 100000 per year, it has major impact on quality of life of affected patients, mostly active young patients. Different management options exist ranging from conservative treatment, to operative repair either open or percutaneous repair.no consensus has been reached on which treatment modality is preferred for each patient .in this study we systematically reviewed the literature for available evidence regarding management of tendon Achilles rupture. Aim of the Study to compare the two methods for treating Acute Achilles tendon rupture in a systematic review with meta-analysis and evaluate the functional outcomes of each methods. The objective is to perform a systematic review of overlapping meta-analysis regarding surgical versus non-surgical management of Acute Achilles tendon rupture to assist the decision makers in selecting their decision and provide intervention recommendations by the best available evidence. Methods This systematic review consisted of 5 studies, including a systematic search of the literature (PubMed, SCOPUS, and The Cochrane Library), selection of studies, extraction of study characteristics, assessment of methodological quality and bias. and extraction of data on clinical outcomes and their comparisons between different surgical groups. Results a total of 9 studies were included, 822 patients were extracted from the included studies. Of the 822 patients, 415 (50.4%) had undergone surgical intervention and 407 (49.6%) had received non-surgical treatment. The minimum follow-up duration was 12 months. The left Achilles tendon was relatively more prone to rupture. The interval from injury to treatment was within 2 to 14 days. Five 5 different surgical techniques were used; end to end, modified Kessler, augmented repair, Krackow type and interrupted circumferential stitch. Operative repair was found to significantly decrease rupture rate (risk ratio of 0.36, 95% CI 0.21-0.64; P = 0.0005) with higher risk of wound complications. No statistically significant difference between the two groups in functional outcome scores and range of motion. Conclusion We conclude that surgical technique lowers the risk of re-rupture rate but associated with higher complication rate which can be reduced by using the minimally invasive techniques. Multicenter randomized clinical trials are needed to obtain a high-quality level of evidence for the comparison between the different modified surgical techniques and the gap effect on making different decision of managements.

Epidemiology of Achilles Tendon Injuries in Collegiate Level Athletes in the United States

Category:Hindfoot, Sports, TraumaIntroduction/Purpose:Achilles tendon rupture is a potentially devastating injury particularly for National Collegiate Athletic Association (NCAA) athletes. Little has been studied regarding the incidence and implications of Achilles tendon ruptures in this patient population. Better characterization of the factors commonly found in athletes who rupture their Achilles may provide clues to aid in their prevention.Methods:Achilles injuries across 16 sports among NCAA men and women during the 2004-05 to 2013-14 academic years were analyzed using the NCAA Injury Surveillance Program (NCAA-ISP). Achilles tendon rupture rates per 100,000 athlete-exposures (IR), operative rate, annual injury rate trends, re-injury rates, mechanism of injury, in-season status (pre/in/post-season) and time loss distributions were compiled and calculated. A sub-analysis of contact sports and sports played by both genders (C-BG) was performed to determine if there were significant differences in risks in patients who played in contact sports.Results:N=255 Achilles tendon injuries were identified over 10 academic years (IR: 2.17). The injury rate was higher in males compared to females (IR=2.33 vs. 1.89 respectively). Achilles injuries were most common in Men’s Basketball (IR=4.26), Soccer (IR=3.06), and Football (IR=2.69). The top three women’s sports with Achilles injury were Gymnastics (IR=16.73), Basketball (IR=3.32), and Soccer (IR=1.81). Thirty-three injuries were operative (13.1%) and 14.9% (N=38) were season-ending injuries. The average time loss was 10.65 days when excluding patients who had season/career ending injuries. Reinjury rate was 11.0% (N=28). 61.2% of all injuries occurred during the regular season (N=156) with 36.0% (N=92) and 2.7% (N=7) occurring in pre- and post- season, respectively. There was a significantly greater number of injuries in contact (N=198) versus non-contact sports (N=50) (p<0.001).Conclusion:Achilles tendon ruptures can be devastating injuries in professional and collegiate athletes. In our study, nearly 15% of all NCAA Achilles tendon ruptures resulted in season ending injuries or significant time loss and over 13% of injuries required operative management with a majority of injuries occurring during practice. In addition, a significantly higher proportion of athletes who played a contact sport had Achilles injuries. Better understanding of what circumstances more often tend to result in Achilles injuries can help establish prevention strategies.

Injury Surveillance in Major League Soccer: A 4-Year Comparison of Injury on Natural Grass Versus Artificial Turf Field

Background: Artificial playing surfaces are becoming more common due to decreased cost of maintenance and increased field usability across different environmental conditions. The Fédération Internationale de Football Association (FIFA) has approved newer generation artificial turf for soccer competition at the elite level, but many elite-level athletes prefer to play on natural grass surfaces due to a perceived increase in injury rate, discomfort, and fatigability on artificial turf. Hypothesis: Injury rates and rates of individually categorized types of injury experienced on artificial turf are noninferior to rates of injury on the standard comparator, natural grass, in elite-level Major League Soccer athletes. Study Design: Cohort study; Level of evidence, 2. Methods: Over the course of 4 Major League Soccer seasons (2013-2016), athlete injury data were recorded electronically. Injury data recorded in matches between 2 Major League Soccer teams were then analyzed. Playing surface was known for each venue, and all artificial turf surfaces were rated as 2-star according to FIFA criteria. Incidence rate ratios (Artificial Turf ÷ Natural Grass) were calculated with a 95% CI (α = .05) for both overall injury incidence and individual injury subgroups. A noninferiority margin (δ) of 0.15 was used to determine noninferiority of injury incidence rates. Results: A total of 2174 in-game injuries were recorded during the study period, with 1.54 injuries per game on artificial turf and 1.49 injuries per game on natural grass (incidence rate ratio, 1.033; 95% CI, 0.937-1.139). Within injury subgroups, overall ankle injury, Achilles injury, and ankle fracture were found to have a statistically higher incidence on artificial turf. Artificial turf was found to be noninferior to natural grass for overall foot injury and forefoot injury. No statistically significant differences were found in knee injuries between the 2 surfaces. Conclusion: The overall rate of injury on artificial turf was noninferior to that on natural grass. Within individual injury categories, a higher rate of ankle injury was found on artificial turf. No other injury subgroup demonstrated statistically significant differences between surfaces. Clinical Relevance: FIFA 2-star rated artificial turf is a viable alternative to natural grass in elite-level soccer competition. Innovative research methods for comparing artificial turf versus natural grass may elucidate relative advantages with respect to player safety.

Quantitative comparison of three rat models of Achilles tendon injury: A multidisciplinary approach

The Achilles tendon, while the strongest and largest tendon in the body, is frequently injured. Inconclusive evidence exists regarding treatment strategies for both complete tears and partial tears. Well-characterized animal models of tendon injury are important for understanding physiological processes of tendon repair and testing potential therapeutics. Utilizing three distinct models of rat Achilles tendon injury, the objective of this study was to define and compare the effects and relative impact on tendon properties and ankle function of both tear severity (complete tear versus partial tear, both with post-operative immobilization) and immobilization after partial tear (partial tear with versus without immobilization). We hypothesized that a complete tear would cause inferior post-injury properties compared to a partial tear, and that immediate loading after partial tear would improve post-injury properties compared to immobilization. All models were reproducible and had distinct effects on measured parameters. Injury severity drastically influenced tendon healing, with complete tear causing decreased ankle mobility and tendon mechanics compared to partial tears. One week of plantarflexion immobilization had a strong effect on animals receiving a partial tear. Tendons with partial tears and immobilization failed early during fatigue cycling three weeks post-injury. Partial tear without immobilization had no effect on ankle range of motion through dorsiflexion at any time point compared to the pre-surgery value, while partial tear with immobilization demonstrated diminished function at all post-injury time points. All three models of Achilles injury could be useful for tendon healing investigations, chosen based on the prospective applications of a potential therapeutic.

Using stiffness to assess injury risk: comparison of methods for quantifying stiffness and their reliability in triathletes.

BackgroundA review of the literature has indicated that lower body stiffness, defined as the extent to which the lower extremity joints resists deformation upon contact with the ground, may be a useful measure for assessing Achilles injury risk in triathletes. The nature of overuse injuries suggests that a variety of different movement patterns could conceivably contribute to the final injury outcome, any number and combination of which might be observed in a single individual. Measurements which incorporate both kinetics and kinematics (such as stiffness) of a movement may be better able to shed light on individuals at risk of injury, with further analysis then providing the exact mechanism of injury for the individual. Stiffness can be measured as vertical, leg or joint stiffness to model how the individual interacts with the environment upon landing. However, several issues with stiffness assessments limit the effectiveness of these measures to monitor athletes’ performance and/or injury risk. This may reflect the variety of common biomechanical stiffness calculations (dynamic, time, true leg and joint) that have been used to examine these three stiffness levels (vertical, leg and joint) across a variety of human movements (i.e. running or hopping) as well as potential issues with the reliability of these measures, especially joint stiffness. Therefore, the aims of this study were to provide a comparison of the various methods for measuring stiffness during two forms of human bouncing locomotion (running and hopping) along with the measurement reliability to determine the best methods to assess links with injury risk in triathletes.MethodsVertical, leg and joint stiffness were estimated in 12 healthy male competitive triathletes on two occasions, 7 days apart, using both running at 5.0 ms−1 and hopping (2.2 Hz) tasks.ResultsInter-day reliability was good for vertical (ICC = 0.85) and leg (ICC = 0.98) stiffness using the time method. Joint stiffness reliability was poor when assessed individually. Reliability was improved when taken as the sum of the hip, knee and ankle (ICC = 0.86). The knee and ankle combination provided the best correlation with leg stiffness during running (Pearson’s Correlation = 0.82).DiscussionThe dynamic and time methods of calculating leg stiffness had better reliability than the “true” method. The time and dynamic methods had the best correlation with the different combinations of joint stiffness, which suggests that they should be considered for biomechanical screening of triathletes. The knee and ankle combination had the best correlation with leg stiffness and is therefore proposed to provide the most information regarding lower limb mechanics during gait in triathletes.

The Relative Risk of Achilles Tendon Injury in Patients Taking Quinolones.

To examine the association between quinolone use and Achilles tendon injury, comparing well-matched cohorts of users of quinolone and nonquinolone antibiotics, and well-matched cohorts of quinolone users and patients not using any nonquinolone antibiotics. This retrospective cohort study used Clinformatics data from 2008-2014. Using the propensity score, we matched quinolone users with other antibiotic users and quinolone users with nonusers. The primary outcome was Achilles tendon injury within 6months. Bivariate analyses determined risk factors for Achilles tendon injury, and conditional logistic regression assessed the impact of quinolone use on these injuries. A total of 716,522 fluoroquinolone users were matched with other antibiotic users, and 645,034 fluoroquinolone users were matched with nonusers. Rates of Achilles tendon injury were less than 0.5% in all groups. Quinolone use increased the risk of Achilles tendon injury compared with other antibiotic users (odds ratio [OR] 1.24, 95% confidence interval [CI] 1.17-1.31) and nonusers (OR 1.54, 95% CI 1.44-1.64). Interaction with age did not significantly impact the relationship between quinolone use and Achilles injury; however, older quinolone users had a slightly higher relative risk of injury than nonusers versus younger patients. Furthermore, the youngest group of patients had similarly elevated relative risk for injury with quinolone use as did the elderly. Although quinolone use increases the risk of Achilles tendon injury, the absolute risk increase is minimal, especially when compared with similar morbidity patients taking other nonquinolone antibiotics. In relatively healthy populations, such as the one studied here, quinolone use may not make a clinically significant contribution to risk of Achilles tendon injury, at any age range, among those in need of such drugs.

Achilles tendon structure is negatively correlated with body mass index, but not influenced by statin use: A cross-sectional study using ultrasound tissue characterization.

IntroductionStatins are widely used to inhibit cholesterol production in the liver among people with hypercholesterolemia. A recent epidemiological study in the UK has shown that statin use (unlike elevated BMI) is not associated with an increased risk of Achilles tendon rupture. However, because of laboratory reports suggesting a negative influence of statins on tenocyte metabolism, we decided to directly compare the Achilles tendon structure (cross-sectional area and longitudinal collagen organization) in regular statin users compared to non-users.MethodsWe conducted ultrasound tissue characterization (UTC) of the Achilles tendon in statin users and a comparison group of similar age and gender. Statin users and control participants were recruited from May 10 2015 to February 17 2017 through a cardiovascular health centre and from the general community. Cross-sectional area of the Achilles tendon and longitudinal collagen organization (% type I echoes) were assessed using quantitative ultrasound tissue characterization by a blinded observer at a predetermined location (2 cm proximal to the calcaneus).ResultsSixty-six individuals who were either taking statins for at least one year (ST, n = 33) or a comparison group who had never taken statins (CG, n = 33) were included in the study. The Achilles tendon cross-sectional area (ST 59.7 (13) mm2, CG 59.9 (8.5) mm2) and proportion of echo-type I patterns [ST 70 (10)%, CG 74 (13)%] were equivalent in the two groups. In contrast, there was a negative correlation between BMI (rs = -0.25, p = 0.042) and type I echo values. Obese individuals demonstrated a significantly lower percentage of type I echoes (62 (11)%) than individuals of normal body mass index (73 (10)% p<0.05).ConclusionThese findings demonstrate that there is no evidence of a negative statin influence on Achilles tendon structure. Given earlier reports that the risk of Achilles injury is equivalent in statin users and non-users, weightbearing exercise may be prescribed without placing the Achilles tendon at a higher risk of injury than among the general population. The results of this study are consistent with the known negative effects of elevated BMI on tendon structure, suggesting that an assessment of the Achilles tendons prior to prescribing weightbearing exercise may be prudent in obese individuals.

Return to Play After Mini-Open Repair of Achilles Tendon Ruptures in the NFL Athlete

Category: Sports Introduction/Purpose: Non-insertional Achilles tendon ruptures are a devastating injury in the National Football League (NFL) athlete. Depending on timing, these often are season ending injuries. There are mixed reports in the literature regarding impact of Achilles injuries in elite athletes. Additionally, there have been advancements in techniques including a mini-open repair that has proven successful. The purpose of this study was to critically analyze a large, single surgeon series of non-insertional Achilles ruptures in NFL athletes treated with a mini-open technique. Our primary focus was to determine return to play and evaluate possible contributing factors that affect this. Additionally, we sought to compare pre and post injury performance for those who successfully returned to the NFL. Methods: NFL athletes treated for non-insertional Achilles ruptures since 2012 were included. Demographic and performance data were obtained from the NFL.com player database and included position, age, years in the league, return to sport and relevant performance metrics listed below. Pre injury frequency of play (games played per total games in season) for athletes were recorded. The impact of injury on performance after return to sport was assessed by comparing data from two years prior and two years post injury, normalized to a “per game” basis. For defensive players, specific metrics included tackles, pass deflection, interceptions and sacks. For offensive players, rushing and receiving statistics for running backs and wide receivers/tight ends were recorded, respectively. Average yards per run/catch, attempts per game, number of 20+ yard plays and touchdowns were recorded. Data was analyzed with Welch’s method 2-Sample t test in Minitab. Results: Thirty-five ruptures were identified in predominantly defensive players (25/35). Ruptures occurred, on average, at age 27.7 years with 4.1 years of NFL experience. There was no significant difference in offensive (70%) and defensive (76%) player’s ability to return to the NFL (p=1.0). The frequency of play in the two seasons prior to injury differed significantly for players who did not return (21%) compared to those who did (95%) (p=.0013). Due to limited skill-position offensive players, further sub- analysis was limited. Defensive players who returned demonstrated significant differences in performance pre-injury compared to players who failed to return. In the two years following injury, returning defensive players performed at near baseline compared to pre injury statistics (figure 1). Conclusion: Achilles injuries occurred predominately in defensive players. Typically occurring past the average NFL career length, it represents a mid to late career injury. The comeback rate of 74% is excellent and is higher than previously reported. Those who failed to return were utilized less frequently pre-injury and had poorer performance statistics (defensive), indicating less talented players were impacted to a greater extent. Lastly, given limited or no differences found in productivity for those who returned, we conclude that while an Achilles injury is most often season ending, most skilled players are able to return with little impact on performance.