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Mansur NSB, Femino JE, Chinnakkannu K, Fayed A, Glass N, Phisitkul P, Amendola A. Posterior Ankle Impingement: It's Not Only About the Os Trigonum. FOOT & ANKLE ORTHOPAEDICS 2024; 9:24730114241241326. [PMID: 38559392 PMCID: PMC10981862 DOI: 10.1177/24730114241241326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024] Open
Abstract
Background Os trigonum and Stieda process are common etiologies for posterior ankle impingement syndrome (PAIS), and diagnosis is typically made by radiographs, computed tomographic, or magnetic resonance imaging. However, these static tests may not detect associated soft tissue and bony pathologies. Posterior ankle and hindfoot arthroscopy (PAHA) is dynamic, providing at least ×8 magnification with full anatomical visualization. The primary aim of this study was to report the prevalence of associated conditions seen with trigonal impingement treated with PAHA. Methods In this retrospective comparative study, patients who underwent PAHA for PAIS due to trigonal impingement, from January 2011 to September 2016, were reviewed. Concomitant open posterior procedures and other indications for PAHA were excluded. Demographic data were collected with pre- and postoperative diagnosis, arthroscopic findings, type of impingement, location, associated procedures, and anatomical etiologies. Trigonal impingements were divided in os trigonal or Stieda and subgrouped as isolated, with flexor hallucis longus (FHL) disorders, with FHL plus other impingement, and with other impingement lesions. Results A total of 111 ankles were studied-74 os trigonum and 37 Stieda. Isolated trigonal disorders accounted for 15.3% of PAIS (n = 17). Cases having associated conditions had a mode of 3 additional pathologies. FHL disorders were found in 69.4%, subtalar impingement in 32.4%, posteromedial ankle synovitis in 25.2%, posterolateral ankle synovitis in 22.5%, and posterior inferior tibiofibular ligament impingement in 19.8% of cases. Associated pathologies were observed in 58.6% of cases when FHL was not considered. Significant differences were noted comparing os and Stieda (isolated: 20.3% to 5.4%, P = .040; FHL plus others: 35.1% to 59.5%, P = .015). Conclusion Trigonal bone (os trigonum or Stieda) was found to cause impingement in isolation in a small proportion of cases even when the FHL was considered part of the same disease spectrum. This should alert surgeons when considering removing trigonal impingement. Open approaches may limit the visualization and assessment of associated posterior ankle and subtalar pathoanatomy, thus possibly overlooking concomitant causes of PAIS. Level of Evidence Level III, retrospective comparative study.
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Affiliation(s)
- Nacime Salomao Barbachan Mansur
- Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
- Department of Orthopedics and Rehabilitation, Paulista School of Medicine, Federal University of Sao Paulo, Brazil
| | - John E. Femino
- Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Karthikeyan Chinnakkannu
- Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
- BronxCare Health System, Bronx, NY, USA
| | - Aly Fayed
- Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Natalie Glass
- Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Phinit Phisitkul
- Department of Orthopaedics, Tri-State Specialists, Sioux City, IA, USA
| | - Annunziato Amendola
- Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC, USA
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Tran NT, Jeon SH, Moon YJ, Lee KB. Continuous detrimental activity of intra-articular fibrous scar tissue in correlation with posttraumatic ankle osteoarthritis. Sci Rep 2023; 13:20058. [PMID: 37973826 PMCID: PMC10654697 DOI: 10.1038/s41598-023-47498-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 11/14/2023] [Indexed: 11/19/2023] Open
Abstract
Posttraumatic osteoarthritis is primarily characterized by articular cartilage destruction secondary to trauma or fracture events. Even while intra-articular scar tissue can be observed following ankle fractures, little is known about its nature and molecular events linking its biological activity and cartilage deterioration. Here, we investigated scar tissue's histological and molecular characteristics, and its relationship with localized articular cartilage alterations consistent with early osteoarthritic degeneration. Intra-articular scar tissues from sixty-two patients who underwent open reduction internal fixation for ankle fracture were obtained at hardware removal time (6-44 months after fracture). Histological analysis demonstrated that scar tissue has the nature of fibrosis with fibrous tissue hyperplasia, fibroblast proliferation, and chondrometaplasia. These fibrous scar tissues showed overexpressed pro-inflammatory cytokines and high mRNA expression levels of osteoarthritis-related markers (cytokines, chemokines, and enzymes) compared to the normal synovium. Furthermore, those transcriptional levels were significantly correlated with the grade of talar chondral degeneration. Our findings suggest that following an ankle fracture, the intra-articular fibrous scar tissue exhibits high catabolic and inflammatory activity, which has a long-lasting negative impact correlated to cartilage deterioration in the development of posttraumatic osteoarthritis.
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Affiliation(s)
- Nhat Tien Tran
- Department of Surgery, University of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Sang-Hyeon Jeon
- Department of Orthopaedic Surgery, Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonbuk National University Medical School, 634-18, Keumam-Dong, Jeonju-Shi, Chonbuk, Republic of Korea
| | - Young Jae Moon
- Department of Orthopaedic Surgery and Biochemistry, Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital and Research Institute for Endocrine Sciences, Jeonbuk National University Medical School, Jeonju, Republic of Korea
| | - Kwang-Bok Lee
- Department of Orthopaedic Surgery, Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonbuk National University Medical School, 634-18, Keumam-Dong, Jeonju-Shi, Chonbuk, Republic of Korea.
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Zhang J, Li X, Fu S, Yang K, Shi Z. Clinical significance of the anteromedial talus osteophyte in anteromedial ankle impingement in chronic lateral ankle instability. J Orthop Surg Res 2023; 18:151. [PMID: 36859336 PMCID: PMC9976382 DOI: 10.1186/s13018-023-03630-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 02/21/2023] [Indexed: 03/03/2023] Open
Abstract
PURPOSE The aim of this study was to evaluate the relation between anteromedial ankle osteophytes (AMAO) and anteromedial ankle impingement (AMAI) in chronic lateral ankle instability (CLAI) through visualization and quantification. METHODS Forty-three patients with unilateral CLAI between September 2018 and March 2020 accepted arthroscopic repair of an anterior talofibular ligament (ATFL) and were split into two groups: AMAI (AMAI including intraoperative AMAO resection) and pure CLAI (with AMAO but without AMAI, no AMAO resection). The AMAO protrusion lengths in each direction were measured and compared after all of the ankles were reconstructed. All patients were assessed preoperatively and at 2-year follow-up with ankle dorsiflexion, the American Orthopedic Foot and Ankle Society (AOFAS) ankle-hindfoot score, and visual analog scale (VAS) score. RESULTS Intelligent analysis showed that a large extent of osteophytes was found at the dorsomedial surface of the talar neck in AMAI group. The upper and inner bound protrusion distances of AMAO in AMAI group were greater than in the pure CLAI group. There was no significant difference in anterior bound protrusion distance of AMAO between the two groups. Preoperatively, the ankle dorsiflexion of AMAI group (7.6 ± 1.4°) was considerably lower than that of pure CLAI group (22.4 ± 1.9°) (p < 0.001). When compared to the pure CLAI group, the AMAI group had a substantially worse AOFAS score (62.2 ± 6.7 vs 71.1 ± 9.1; p < 0.001) and VAS score (6.0 ± 1.0 vs 4.9 ± 0.8; p < 0.05). However, there was no significant difference in postoperative ankle dorsiflexion, AOFAS score, or VAS score between the two groups. CONCLUSION AMAO is formed mostly on the dorsomedial surface of the talar neck in CLAI with AMAI, and the upper and inner bound protrusion lengths of AMAO were shown to be significantly correlated with the existence of AMAI in CLAI. LEVEL OF EVIDENCE IV
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Affiliation(s)
- Jieyuan Zhang
- grid.412528.80000 0004 1798 5117Department of Orthopedic Surgery, Shanghai Sixth People’s Hospital, 600 Yishan Road, Shanghai, 200233 China
| | - Xueqian Li
- grid.412528.80000 0004 1798 5117Department of Orthopedic Surgery, Shanghai Sixth People’s Hospital, 600 Yishan Road, Shanghai, 200233 China
| | - Shaoling Fu
- grid.412528.80000 0004 1798 5117Department of Orthopedic Surgery, Shanghai Sixth People’s Hospital, 600 Yishan Road, Shanghai, 200233 China
| | - Kai Yang
- Department of Radiology, Shanghai Sixth People's Hospital, 600 Yishan Road, Shanghai, 200233, China.
| | - Zhongmin Shi
- Department of Orthopedic Surgery, Shanghai Sixth People's Hospital, 600 Yishan Road, Shanghai, 200233, China.
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Fischer S, Weber S, Gramlich Y, Blank M, Buckup J, Manegold S, Hoffmann R. Electrothermal Denervation of Synovial and Capsular Tissue Does not Improve Postoperative Pain in Arthroscopic Debridement of Anterior Ankle Impingement—A Prospective Randomized Study. Arthrosc Sports Med Rehabil 2022; 4:e575-e583. [PMID: 35494284 PMCID: PMC9042778 DOI: 10.1016/j.asmr.2021.11.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 11/13/2021] [Indexed: 10/25/2022] Open
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Gianakos AL, Ivander A, DiGiovanni CW, Kennedy JG. Outcomes After Arthroscopic Surgery for Anterior Impingement in the Ankle Joint in the General and Athletic Populations: Does Sex Play a Role? Am J Sports Med 2021; 49:2834-2842. [PMID: 33400547 DOI: 10.1177/0363546520980096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Although anterior ankle impingement is a common pathology within the athletic population, there have been limited data evaluating outcomes of arthroscopic intervention and whether patient sex affects treatment outcomes. PURPOSE To provide an overview of the clinical outcomes of arthroscopic procedures used as a treatment strategy for anterior ankle impingement and to determine if patient sex affects outcomes. STUDY DESIGN Systematic review. METHODS A systematic literature search of the MEDLINE, Embase, and Cochrane databases was performed during August 2019. The following combination of search terms was utilized: "ankle," "impingement," "talus," "osteophyte," "arthroscopy," "surgery," "procedures," and "treatment." Two reviewers independently performed data extraction. RESULTS A total of 28 articles evaluating 1506 patients were included in this systematic review. Among the studies, 60% (17/28) and 14% (4/28) assessed anterolateral and anteromedial impingement, respectively. Good to excellent results were reported after arthroscopy in patients with anterior ankle impingement, with a success rate of 81.04%. All studies that evaluated functional outcomes (16/16; 100%) cited improvements in American Orthopaedic Foot & Ankle Society scale, visual analog scale, and Foot Function Index. The average complication rate was 4.01%, with the most common complications being mild nerve symptoms and superficial infection. The most common concomitant pathologies included synovitis, osteophytes, meniscoid lesions, and anterior inferior tibiofibular ligament injury. Four studies (15%) failed to report sex as a demographic variable. Only 7 (25%) studies included analysis by sex, with 4 (57%) of these demonstrating differences when comparing outcomes by patient sex. When compared with male patients, female patients exhibited higher rates of traumatic ankle sprains, chondral injury, and chronic ankle instability associated with anterior ankle impingement. CONCLUSION Our systematic review demonstrates that arthroscopic treatment for anterior ankle impingement provides good to excellent functional outcomes, low complication rates, and good return-to-sports rates in both the general and the athletic population. This study also reports a lack of statistical analysis evaluating outcomes comparing male and female populations. The included studies demonstrate that, compared with male patients, female patients have higher rates of traumatic ankle sprains, chondral injury, and chronic ankle instability associated with anterior ankle impingement; therefore, particular attention should be paid to addressing such concomitant pathology.
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Affiliation(s)
- Arianna L Gianakos
- Department of Orthopedic Surgery, Robert Wood Johnson Barnabas Health-Jersey City Medical Center, Jersey City, New Jersey, USA
| | - Axel Ivander
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
| | - Christopher W DiGiovanni
- Foot and Ankle Service, Department of Orthopaedic Surgery, Harvard-Massachusetts General Hospital, Boston, Massachusetts, USA
| | - John G Kennedy
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
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Abstract
Ankle impingement presents with painful and limited range of motion with dorsiflexion or plantar flexion, originating from pathological contact between bone and/or soft-tissue structures. Diagnosis is made primarily through clinical examination with adjunct radiographs and magnetic resonance imaging, with care taken to rule out a plethora of similarly presenting pathologies. Arthroscopic surgical approaches bring satisfactory short, mid, and long-term outcomes, with the current body of evidence dominated by Level-IV studies. Minimally invasive techniques offer improvements in time to return to play and complication rates relative to open approaches. Recent advances in the arthroscopic management of ankle impingement include long-term outcome studies, novel prognostic classification systems, and strategies for concomitant lesion management.
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Diniz P, Sousa DA, Batista JP, Abdelatif N, Pereira H. Diagnosis and treatment of anterior ankle impingement: state of the art. J ISAKOS 2020. [DOI: 10.1136/jisakos-2019-000282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Chen L, Wang X, Huang J, Zhang C, Wang C, Geng X, Ma X. Outcome Comparison Between Functional Ankle Instability Cases With and Without Anterior Ankle Impingement: A Retrospective Cohort Study. J Foot Ankle Surg 2019; 58:52-56. [PMID: 30583782 DOI: 10.1053/j.jfas.2018.07.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Indexed: 02/03/2023]
Abstract
Functional ankle instability (FAI) and anterior ankle impingement (AAI) are likely to occur simultaneously. Nevertheless, how AAI affects ankle instability remains largely unknown. This study aimed to assess patients with FAI + AAI and those having FAI without AAI after arthroscopic synovectomy combined with the modified Broström procedure. Patients with chronic ankle instability who underwent surgery at the Huashan Hospital of Fudan University (China) from January 2010 to December 2015 were reviewed. Propensity score matching was performed (FAI + AAI: n = 86; FAI without AAI: n = 43). Ankle function was assessed by the American Orthopedic Foot and Ankle Society (AOFAS) and the Meislin criteria at 3 months, 1 year, and final follow-up. In the FAI + AAI group, AOFAS scores increased from 52.6 ± 7.2 to 78.6 ± 8.2, 84.2 ± 6.4, and 83.6 ± 11.3 at 3 months, 1 year, and last follow-up, respectively (p < .001). In the FAI without AAI group, AOFAS scores increased from 64.3 ± 10.5 to 85.2 ± 8.6, 91.4 ± 7.9, and 90.2 ± 9.8 at 3 months, 1 year, and last follow-up, respectively (p < .001; all p < .05 for differences between the 2 groups at each time point). The 2 groups showed similar scores based on the Meislin criteria (p = .38). Hypertrophic distal fascicle of the anteroinferior tibiofibular ligament showed lower AOFAS scores (all p < .05). Patients with FAI with or without AAI had improved outcomes with arthroscopic synovectomy combined with the modified Broström procedure; however, patients with combined FAI and AAI showed a relatively poorer outcome in comparison with those suffering from FAI alone, probably because of hypertrophic distal fascicle of the anteroinferior tibiofibular ligament.
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Affiliation(s)
- Li Chen
- Surgeon, Department of Orthopedics, Huashan Hospital of Fudan University, Shanghai, China
| | - Xu Wang
- Professor, Department of Orthopedics, Huashan Hospital of Fudan University, Shanghai, China
| | - Jiazhang Huang
- Professor, Department of Orthopedics, Huashan Hospital of Fudan University, Shanghai, China
| | - Chao Zhang
- Surgeon, Department of Orthopedics, Huashan Hospital of Fudan University, Shanghai, China
| | - Chen Wang
- Surgeon, Department of Orthopedics, Huashan Hospital of Fudan University, Shanghai, China
| | - Xiang Geng
- Surgeon, Department of Orthopedics, Huashan Hospital of Fudan University, Shanghai, China
| | - Xin Ma
- Professor, Department of Orthopedics, Huashan Hospital of Fudan University, Shanghai, China.
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Baldassarri M, Perazzo L, Ricciarelli M, Natali S, Vannini F, Buda R. Regenerative treatment of osteochondral lesions of distal tibial plafond. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY 2018; 28:1199-1207. [PMID: 29476376 DOI: 10.1007/s00590-018-2161-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 02/13/2018] [Indexed: 12/26/2022]
Abstract
OBJECTIVES Osteochondral lesions of the distal tibial plafond (OLTP) are rare and far less common than osteochondral lesions of the talus. Literature data do not report clinical records with significant number of cases and follow-up. The aim of our study was to evaluate clinical and MRI outcomes following arthroscopic treatment of distal tibia osteochondral lesions and to report our results with treating these rare lesions. METHODS Between October 2010 and November 2011, a consecutive series of 27 patients, 15 males and 12 females, were treated arthroscopically with the one-step BMDCT for OLTPs. Exclusion criteria were: age < 18 or > 50 years, patients with severe osteoarthritis (stage III according to Van Dijk classification), presence of kissing lesions of the ankle and patients with rheumatoid or hemophilic arthritis. All patients were evaluated through X-rays; MRI was performed preoperatively and at the final follow-up with MOCART score; clinical evaluation was assessed by AOFAS score at various follow-ups of 12, 24, 36, 60 and 72 months. RESULTS No complications were observed post-surgery or during the rehabilitation period. The AOFAS score improved from 52.4 preoperatively to 80.6 at the mean final follow-up. All the patients were satisfied with the procedure. In 14 cases the MRI showed a complete filling of the osteochondral defect, in three patients a hypertrophic tissue was observed, and in the other two patients an incomplete repair of the lesion associated with a persistent slight subchondral edema was reported. A topographic study was also performed. CONCLUSIONS Osteochondral lesions of the distal tibia represent a challenge for the orthopedic surgeon because of their difficulty diagnostic and rarities. The high incidence of good outcome in our series indicates that the one-step BMDCT could be a valid option for the treatment of this rare type of lesions. Further studies with a longer follow-up and more accurate imaging studies are necessary to confirm these results.
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Affiliation(s)
- Matteo Baldassarri
- I Clinic, Rizzoli Orthopedic Institute of Bologna, Via Giulio Cesare Pupilli 1, 40136, Bologna, Italy.
| | - Luca Perazzo
- I Clinic, Rizzoli Orthopedic Institute of Bologna, Via Giulio Cesare Pupilli 1, 40136, Bologna, Italy
| | - Marco Ricciarelli
- I Clinic, Rizzoli Orthopedic Institute of Bologna, Via Giulio Cesare Pupilli 1, 40136, Bologna, Italy
| | - Simone Natali
- I Clinic, Rizzoli Orthopedic Institute of Bologna, Via Giulio Cesare Pupilli 1, 40136, Bologna, Italy
| | - Francesca Vannini
- I Clinic, Rizzoli Orthopedic Institute of Bologna, Via Giulio Cesare Pupilli 1, 40136, Bologna, Italy
| | - Roberto Buda
- I Clinic, Rizzoli Orthopedic Institute of Bologna, Via Giulio Cesare Pupilli 1, 40136, Bologna, Italy
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Abstract
BACKGROUND Corticosteroid injections have been used for a variety of foot and ankle pathologies over the years, and our aim was to evaluate the efficacy and safety of them in our clinic. MATERIALS AND METHODS We performed a retrospective review of notes and a telephone questionnaire on the clinical outcome of all patients who underwent a corticosteroid injection of the foot or ankle in a year. All procedures were performed in an outpatient setting by a consultant musculoskeletal radiologist using either ultrasound or X-ray guidance and had a minimum of 2 years of follow-up. RESULTS Overall, 314 of 365 (86%) patients reported a significant improvement in symptoms, and 242 (66%) reported complete resolution of their pain, with 107 (29%) remaining asymptomatic at the 2-year follow-up. The mode time of recurrence of pain was 3 months. Fifty-one (14%) underwent a further injection and 88 (24%) underwent operative intervention within the follow-up period. Complication rates in our series were low. There were no reported infections. Complications occurred in 5 patients (1.3%), including steroid flare, pain, and plantar plate ruptures. CONCLUSION Corticosteroid injections were a safe and effective option for treating a variety of foot and ankle conditions and reduced the need for surgery. They were particularly effective for the treatment of ankle soft tissue impingement. They appear ineffective in providing significant improvement in pain for longer than 3 months in conditions such as plantar fasciitis and hallux rigidus. LEVEL OF EVIDENCE IV, case series.
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Affiliation(s)
- John Grice
- 1 Fortius Clinic, London, UK.,2 Great Western Hospital NHS Trust, Swindon, Wiltshire, UK
| | | | - George Smith
- 3 Norfolk and Norwich University Hospital, Norwich, UK
| | - James Calder
- 1 Fortius Clinic, London, UK.,4 Imperial College London, Musculoskeletal Surgery Academic Department, South Kensington Campus, London, UK
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Abstract
Ankle impingement is a syndrome that encompasses a wide range of anterior and posterior joint pathology involving both osseous and soft tissue abnormalities. In this review, the etiology, pathoanatomy, diagnostic workup, and treatment options for both anterior and posterior ankle impingement syndromes are discussed.
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Affiliation(s)
- Kyle P Lavery
- Division of Sports Medicine, Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA.
| | - Kevin J McHale
- Division of Sports Medicine, Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA
| | - William H Rossy
- Division of Sports Medicine, Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA
| | - George Theodore
- Division of Sports Medicine, Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 175 Cambridge Street, Suite 400, Boston, MA, 02114, USA
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