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Matković A, Ferenc T, Dimnjaković D, Jurjević N, Vidjak V, Matković BR. Osteochondritis Dissecans of the Elbow in Overhead Athletes: A Comprehensive Narrative Review. Diagnostics (Basel) 2024; 14:916. [PMID: 38732330 PMCID: PMC11083537 DOI: 10.3390/diagnostics14090916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Accepted: 04/26/2024] [Indexed: 05/13/2024] Open
Abstract
Osteochondritis dissecans (OCD) of the elbow mainly occurs in overhead athletes (OHAs). This narrative review aimed to comprehensively analyze the epidemiological data, etiological factors, clinical and imaging features, treatment options, and outcomes of OHAs with the diagnosis of elbow OCD. A literature search was performed in PubMed/MEDLINE, Scopus, and Web of Science. Individuals with elbow OCD were usually 10-17 years of age with incidence and prevalence varying between studies, depending on the sport activity of the patients. The etiology of OCD lesions is multifactorial, and the main causes are believed to be repetitive trauma, the biomechanical disproportion of the articular surfaces, poor capitellar vascular supply, and inflammatory and genetic factors. Athletes usually presented with elbow pain and mechanical symptoms. The mainstay for the diagnosis of elbow OCD is MRI. The treatment of elbow OCD lesions should be conservative in cases of stable lesions, while various types of surgical treatment are suggested in unstable lesions, depending mainly on the size and localization of the lesion. The awareness of medical practitioners and the timely diagnosis of OCD lesions in OHAs are key to favorable outcomes.
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Affiliation(s)
- Andro Matković
- Department of Diagnostic and Interventional Radiology, Merkur University Hospital, 10000 Zagreb, Croatia; (A.M.)
| | - Thomas Ferenc
- Department of Diagnostic and Interventional Radiology, Merkur University Hospital, 10000 Zagreb, Croatia; (A.M.)
| | - Damjan Dimnjaković
- Department of Orthopedic Surgery, University Hospital Centre Zagreb, 10000 Zagreb, Croatia
- School of Medicine, University of Zagreb, 10000 Zagreb, Croatia
| | - Nikolina Jurjević
- Department of Diagnostic and Interventional Radiology, Merkur University Hospital, 10000 Zagreb, Croatia; (A.M.)
| | - Vinko Vidjak
- Department of Diagnostic and Interventional Radiology, Merkur University Hospital, 10000 Zagreb, Croatia; (A.M.)
- School of Medicine, University of Zagreb, 10000 Zagreb, Croatia
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Leal J, Hones KM, Hao KA, Slaton PT, Roach RP. Arthroscopy and Microfracture for Osteochondritis Dissecans of the Capitellum in Adolescent Athletes Shows Favorable Return to Sport: A Systematic Review. Arthroscopy 2024; 40:1325-1339. [PMID: 37714441 DOI: 10.1016/j.arthro.2023.08.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 08/13/2023] [Accepted: 08/15/2023] [Indexed: 09/17/2023]
Abstract
PURPOSE To assess return to sport (RTS) in the high-risk young athlete population with capitellar osteochondritis dissecans (OCD) undergoing arthroscopic microfracture (MFX) with or without debridement as well as associated indications, clinical outcomes, radiographic outcomes, and complications. METHODS A literature search of all published literature in the English language from PubMed, EMBASE, Scopus, and Cochrane from database inception to April 4, 2022, was performed following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Included studies presented demographics and outcomes for adolescent (<21 years old) patients diagnosed with capitellar OCD who underwent arthroscopic MFX (or drilling/subchondral drilling) or MFX (or drilling/subchondral drilling) with debridement (or loose body removal/chondroplasty). Studies containing multiple surgical techniques that did not distinguish characteristics and outcomes of individual patients by surgical technique were excluded. Additionally, if there was overlap in patient populations between 2 studies, the study with less outcome data was excluded. Extracted data included study properties, patient demographics, lesion characteristics, surgery details, and patient outcomes, including range of motion, outcome scores, and RTS rates. Bias was assessed via the Methodological Index for Non-Randomized Studies (MINORS). RESULTS Nine studies of 136 patients and 138 elbows met criteria. Included articles were published between 2005 and 2020 with MINORS scores of 8 to 14 (50% to 88%). The age ranged from 12.7 to 15.7 years with most patients being involved in baseball or gymnastics and a rate of dominant elbow involvement of 55% to 100%. Patient follow-up ranged from 16 to 138 months. All 9 studies reported RTS, ranging from 65% to 100%. Six of these studies categorized the level to which the patient returned, with patients RTS at the same level of competition ranging from 60% to 100%. Six studies reported complications, with a range rate of 0% to 43%; there were a total of 10 complications, 7 of which required reoperations. CONCLUSIONS Arthroscopic MFX with or without arthroscopic debridement is a safe and effective treatment for OCD lesions of the capitellum in young, athletic patients. Included studies reported improved clinical, radiographic, and patient-reported outcomes. Aside from 1 study reporting an RTS of 65%, the rate of RTS ranged from 86% to 100%. The percentage of patients returning to sport at the same level of competition ranged from 60% to 100% with a time to RTS ranging from 4.1 to 5 months. A single study reported a complication rate of 43%, while remaining studies reported complication rates between 0% and 19%, with loose bodies being the most common complication requiring reoperation. Follow-up ranged from 16 to 138 months. LEVEL OF EVIDENCE Level IV, systematic review of Level IV studies.
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Affiliation(s)
- Justin Leal
- College of Medicine, University of Florida, Gainesville, Florida, U.S.A..
| | - Keegan M Hones
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, Florida, U.S.A
| | - Kevin A Hao
- College of Medicine, University of Florida, Gainesville, Florida, U.S.A
| | | | - Ryan P Roach
- Department of Orthopaedic Surgery and Sports Medicine, University of Florida, Gainesville, Florida, U.S.A
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De Nordenflycht D, Matus G, Aravena JP, Toloza H. Osteochondritis dissecans of the temporomandibular joint: a scoping review. Oral Maxillofac Surg 2024; 28:29-38. [PMID: 36631710 DOI: 10.1007/s10006-022-01134-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 12/13/2022] [Indexed: 01/13/2023]
Abstract
PURPOSE To perform a scoping review to identify the available evidence regarding osteochondritis dissecans (OCD) of the temporomandibular joint (TMJ). METHODS An electronic search of the PubMed, Web of Science and Scopus databases was performed using the following terms: 'Temporomandibular Joint Disorders', 'Osteochondritis Dissecans', 'Joint Loose Bodies' and 'Temporomandibular Joint'. Full-text articles were obtained from the records after applying the inclusion/exclusion criteria. RESULTS Ten articles were included in the analysis - six case reports, one case series, one retrospective study, one comparative study and one correlational study - with a total of 39 patients. The most frequently reported clinical presentation involved TMJ pain, locked jaw and articular noises (clicking and crepitus). The imaging methods used to identify OCD were radiographs, tomography, arthrography and magnetic resonance imaging. The reported imaging findings varied widely, but the most frequent were (single or multiple) calcified intra-articular loose bodies, signs of degenerative osseous changes, disc displacements, widening of the joint space and alterations in condylar morphology. Seven articles reported treatments (surgical or conservative), but the treatment outcome was not reported in all of the articles, which makes it difficult to make comparisons. CONCLUSION OCD of the TMJ may present various non-specific clinical characteristics, and given the heterogeneous imaging findings, multiplanar images are required for an accurate diagnosis. Finally, the results do not allow recommending a standard treatment for OCD of the TMJ.
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Affiliation(s)
- Diego De Nordenflycht
- Universidad Andres Bello, Faculty of Dentistry, Quillota # 980 Torre E, Viña del Mar, Chile.
| | | | | | - Héctor Toloza
- Universidad Andres Bello, Faculty of Dentistry, Quillota # 980 Torre E, Viña del Mar, Chile
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Breulmann F, Mehl J, Otto A, Lappen S, Siebenlist S, Rab P. [Treatment of osteochondritis dissecans]. ORTHOPADIE (HEIDELBERG, GERMANY) 2024; 53:69-82. [PMID: 38189958 DOI: 10.1007/s00132-023-04461-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/14/2023] [Indexed: 01/09/2024]
Abstract
Osteochondritis dissecans (OD) is a rare condition with an incidence of 30/100,000. It especially affects male patients aged 10-20 years old. During the staged progression the osteochondral fragments can detach from their base. These can damage the adjacent articular cartilage, which can lead to premature osteoarthritis. Most commonly affected are the knee, ankle and elbow joints. The exact pathogenesis of OD has so far not been clearly confirmed. Several risk factors that can lead to the development of OD are discussed. These include repeated microtrauma and vascularization disorders that can lead to ischemia of the subchondral bone and to a separation of the fragments close to the joint and therefore to the development of free joint bodies. For an adequate clarification patients should undergo a thorough radiological evaluation including X‑ray imaging followed by magnetic resonance imaging (MRI) to assess the integrity of the cartilage-bone formation with determination of the OD stage. The assessment is based on criteria of the International Cartilage Repair Society (ICRS). The instability of the cartilage-bone fragment increases with higher stages. Stages I and II with stable cartilage-bone interconnection can be treated conservatively. For stages III and IV, i.e., instability of the OD fragment or the presence of free fragments, surgical treatment should be performed. Primarily, refixation of a free joint body should be carried out depending on the size and vitality of the fragment. In cases of unsuccessful conservative treatment or fixation, a debridement, if necessary in combination with a bone marrow stimulating procedure, can be employed corresponding to the size of the defect. For larger cartilage defects, an osteochondral graft transplantation should be considered. Overall, OD lesions in stages I and II show a good healing tendency under conservative treatment. In cases of incipient unstable OD, refixation can also lead to good clinical and radiological results.
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Affiliation(s)
- Franziska Breulmann
- Sektion Sportorthopädie, Klinikum rechts der Isar, Technische Universität München, 81675, München, Deutschland
| | - Julian Mehl
- Sektion Sportorthopädie, Klinikum rechts der Isar, Technische Universität München, 81675, München, Deutschland
| | - Alexander Otto
- Sektion Sportorthopädie, Klinikum rechts der Isar, Technische Universität München, 81675, München, Deutschland
| | - Sebastian Lappen
- Sektion Sportorthopädie, Klinikum rechts der Isar, Technische Universität München, 81675, München, Deutschland
| | - Sebastian Siebenlist
- Sektion Sportorthopädie, Klinikum rechts der Isar, Technische Universität München, 81675, München, Deutschland.
| | - Peter Rab
- Sektion Sportorthopädie, Klinikum rechts der Isar, Technische Universität München, 81675, München, Deutschland
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Myers NL, Kennedy SM, Thorburn LD, Conway JE, Garrison JC. Return to Sport and Clinical Outcomes Following Osteochondral Autograft Transplantation in Baseball Players and Gymnasts With Unstable Osteochondritis Dissecans: A Critically Appraised Topic. J Sport Rehabil 2023; 32:932-937. [PMID: 37558221 DOI: 10.1123/jsr.2022-0446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 05/18/2023] [Accepted: 06/19/2023] [Indexed: 08/11/2023]
Abstract
CLINICAL SCENARIO Osteochondritis dissecans (OCD) of the capitellum is a condition occurring at the elbow and often seen in both baseball players and gymnasts due to the repetitive loading of the radiocapitellar joint. Treatment options for OCD vary and are dependent on lesion presentation, elbow motion, and growth plate maturity. OCD lesions categorized as unstable can be treated with an osteochondral autograft transplantation surgery (OATS). FOCUSED CLINICAL QUESTION In an adolescent population, what are the return to sport rates and clinical outcomes following OATS in baseball players and gymnasts with unstable OCD lesions? SUMMARY OF KEY FINDINGS Three articles met the inclusion criteria for this appraisal, and all indicate an OATS procedure should be considered in the management of unstable OCD lesions. Return to play outcomes were favorable for both baseball players and gymnasts. Self-reported patient function and elbow extension all improved following an OATS. CLINICAL BOTTOM LINE An OATS procedure is a favorable option for the management of OCD lesions of the elbow in baseball players and gymnasts. STRENGTH OF RECOMMENDATION There is level B evidence to support return to sport and clinical outcomes in baseball players and gymnasts following an OATS procedure. This score is directly related to the quality of evidence that currently exists on the topic.
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Affiliation(s)
- Natalie L Myers
- Memorial Hermann's Rockets Sports Medicine Institute, Houston, TX,USA
| | - Sean M Kennedy
- Memorial Hermann's Rockets Sports Medicine Institute, Houston, TX,USA
| | - Luke D Thorburn
- Memorial Hermann's Rockets Sports Medicine Institute, Houston, TX,USA
| | - John E Conway
- UTHealth Houston McGovern Medical School Orthopedic Surgery, Houston, TX,USA
| | - J Craig Garrison
- Memorial Hermann's Rockets Sports Medicine Institute, Houston, TX,USA
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Andras LM, Sanders JS, Goldstein RY, Samora JB. What's New in Pediatric Orthopaedics. J Bone Joint Surg Am 2023; 105:269-276. [PMID: 36729585 DOI: 10.2106/jbjs.22.01195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Lindsay M Andras
- Jackie and Gene Autry Orthopedic Center, Children's Hospital Los Angeles, Los Angeles, California
| | - Julia S Sanders
- Department of Orthopedic Surgery, University of Colorado, Aurora, Colorado
| | - Rachel Y Goldstein
- Jackie and Gene Autry Orthopedic Center, Children's Hospital Los Angeles, Los Angeles, California
| | - Julie Balch Samora
- Department of Orthopedic Surgery, Nationwide Children's Hospital, Columbus, Ohio
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Malik SS, Rasidovic D, Saeed A, Jordan RW, Maclean S, I Bain G. Management of osteochondritis dissecans (OCD) of the elbow trochlea in the adolescent population: A systematic review. Shoulder Elbow 2022; 14:415-425. [PMID: 35846402 PMCID: PMC9284302 DOI: 10.1177/17585732221079585] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/11/2022] [Accepted: 01/13/2022] [Indexed: 11/17/2022]
Abstract
Background Elbow trochlea osteochondritis dissecans (OCD) is rare with limited information on it. The aim of this systematic review is to assess the published evidence on trochlea OCD in terms of presenting symptoms, location of OCD and outcome of management in adolescent patients. Patient & Methods A review of the online databases MEDLINE and Embase was conducted according to PRISMA guidelines. The review was registered prospectively in the PROSPERO database. Clinical studies reporting on any aspect of trochlea OCD management were eligible for inclusion and appraised using the Methodological Index for Non-Randomized Studies (MINORS) tool. Results 16 studies were eligible for inclusion with a total of 75 elbow. Mean age was 14 years (8-19) of which 46 were males. The main presenting symptoms were pain (95%). Non-operative care was reported in 86% of elbows with resolution of symptoms in 76%. Surgical management was described in 14%. There were equal number of arthroscopic and open procedures. 94% had successfully resolution of symptoms post-operatively. Conclusion Elbow trochlea OCD is a rare pathology and one that can be managed non-operatively in the majority of cases with good resolution of symptoms. However, if this fails, operative options are available with excellent results reported. Level of evidence Level IV, Systematic review.
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Affiliation(s)
| | | | - Abu Saeed
- Worcestershire Acute Hospitals NHS Trust, Worcester, UK
| | - Robert W Jordan
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
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Common Upper Extremity Injuries in Pediatric Athletes. Curr Rev Musculoskelet Med 2022; 15:465-473. [PMID: 35913666 PMCID: PMC9789231 DOI: 10.1007/s12178-022-09784-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/21/2022] [Indexed: 12/27/2022]
Abstract
PURPOSE OF REVIEW The aim of this study is to review the most recent literature on common upper extremity injuries in pediatric athletes and discuss their diagnosis, management, and outcomes. We also highlight ultrasound as a tool in their evaluation. RECENT FINDINGS Shoulder conditions presented include little league shoulder, glenohumeral rotation deficit, acute traumatic shoulder dislocation, and multidirectional shoulder instability. Elbow conditions include capitellar OCD, medial epicondyle avulsion fracture, and medial epicondylitis. We also review scaphoid fractures and gymnast wrist. Not all physeal injuries lead to long-term growth disruption. Ultrasound has been shown to be useful in the diagnosis of scaphoid fracture, medial epicondyle avulsion fractures, and capitellar OCD. It can also be helpful in assessing risk for shoulder and elbow injuries in overhead athletes. There is a rising burden of upper extremity injuries among pediatric athletes. Knowledge of their sport specific mechanics can be helpful in diagnosis. As long-term outcome data become available for these conditions, it is clear, proper diagnosis and management are critical to preventing adverse outcomes. We highlight many of these injuries, best practice in care, and controversies in care in hopes of improving outcomes and preventing injury for pediatric athletes.
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3D Printing for Cartilage Replacement: A Preliminary Study to Explore New Polymers. Polymers (Basel) 2022; 14:polym14051044. [PMID: 35267866 PMCID: PMC8914867 DOI: 10.3390/polym14051044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 02/05/2023] Open
Abstract
The use of additive manufacturing technologies for biomedical applications must begin with the knowledge of the material to be used, by envisaging a very specific application rather than a more general aim. In this work, the preliminary study was focused on considering the cartilaginous tissue. This biological tissue exhibits different characteristics, such as thickness and mechanical properties, depending on its specific function in the body. Due to the lack of vascularization, cartilage is a supporting connective tissue with limited capacity for recovery and regeneration. For this reason, any approach, whether to repair/regenerate or as a total replacement, needs to fulfill the adequate mechanical and chemical properties of the surrounding native cartilage to be successful. This work aims to explore the possibility of using new polymers for cartilage total replacement approaches with polymeric materials processed with the specific 3D printing technique of fused filament fabrication (FFF). The materials studied were Nylon® 12 (PA12), already described for this purpose, and LAY-FOMM® 60 (FOMM). FOMM has not been described in the literature for biomedical purposes. Therefore, the chemical, thermal, swelling capacity, and mechanical properties of the filaments were thoroughly characterized to better understand the structure–properties–application relationships of this new polymer. In addition, as the FFF technology is temperature based, the properties were also evaluated in the printed specimens. Due to the envisaged application, the specimens were also characterized in the wet state. When comparing the obtained results with the properties of native cartilage, it was possible to conclude that: (i) PA12 exhibits low swelling capacity, while FOMM, in its dry and wet forms, has a higher swelling capacity, closer to that of native cartilage; (ii) the mechanical properties of the polymeric materials, especially PA12, are higher than those of native cartilage; and (iii) from the mechanical properties evaluated by ultra-micro hardness tests, the values for FOMM indicate that this material could be a good alternative for cartilage replacement in older patients. This preliminary study, essentially devoted to expanding the frontiers of the current state of the art of new polymeric materials, provides valuable indications for future work targeting the envisaged applications.
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Wang CK, Cohen D, Kay J, Almasri M, Simunovic N, Cardenas-Nylander C, Ranawat AS, Ayeni OR. The Effect of Femoral and Acetabular Version on Outcomes Following Hip Arthroscopy: A Systematic Review. J Bone Joint Surg Am 2022; 104:271-283. [PMID: 34878411 DOI: 10.2106/jbjs.21.00375] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Torsional hip deformities are common among patients undergoing hip arthroscopy. However, recent studies have suggested conflicting outcomes following arthroscopy in the setting of abnormal hip version. The purpose of this study was to systematically evaluate the literature and determine the impact of femoral and acetabular version on patient-reported outcomes following primary arthroscopic hip surgery. METHODS This study was conducted in accordance with the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) statement. Studies investigating femoral and acetabular version in primary hip arthroscopy with clinical outcomes were identified, and data were extracted in duplicate. RESULTS Overall, 11 studies met inclusion criteria and comprised 1,297 hips (726 femora and 571 acetabulae), with a mean patient age of 29.2 years (range, 14 to 74.7 years). In patients with acetabular retroversion, there was no significant difference, when compared with the normal acetabular version group, in the modified Harris hip score (mHHS), the Hip Outcome Score-Sports Specific Subscale (HOS-SSS), and visual analog scale (VAS) pain scores postoperatively. Among patients with femoral retroversion, in 2 of 3 studies, the authors reported no difference in mHHS postoperatively compared with patients with normal femoral version. In patients with high femoral anteversion, in 2 of 3 studies, the authors reported a significant difference in postoperative mHHS favoring patients with normal femoral version. Studies examining high femoral anteversion included patients with borderline hip dysplasia and patients who underwent concurrent psoas-lengthening procedures. CONCLUSIONS Although the definition of the normal version of the hip varied within the literature, hip arthroscopy in patients with acetabular retroversion resulted in no difference in functional outcomes compared with patients with normal version. Postoperative functional outcomes in patients with femoral retroversion and high femoral anteversion were mixed, although the procedure was possibly less effective in high femoral anteversion combined with specific clinical scenarios. Further prospective studies based on standardized definitions and version analysis techniques would be useful in identifying the precise surgical indications for safe arthroscopic surgical procedures in patients with version abnormalities of the femur and acetabulum, particularly those with high femoral anteversion and retroversion. LEVEL OF EVIDENCE Prognostic Level IV. See Instructions for Authors for a complete description of levels of evidence.
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Affiliation(s)
- Casey K Wang
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario, Canada
| | - Dan Cohen
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario, Canada
| | - Jeffrey Kay
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario, Canada
| | - Mahmoud Almasri
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario, Canada.,Mercy Health Cincinnati Sports Medicine and Orthopaedic Center, Cincinnati, Ohio
| | - Nicole Simunovic
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario, Canada
| | | | | | - Olufemi R Ayeni
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario, Canada.,Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, Ontario, Canada
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