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Xiao M, Welch JM, Cohen SA, Kamal RN, Shapiro LM. How Is Scaphoid Malunion Defined: A Systematic Review. Hand (N Y) 2023; 18:38S-45S. [PMID: 34486427 PMCID: PMC10052615 DOI: 10.1177/15589447211038678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Abnormal scaphoid alignment after fracture is used as an indication for fixation. Acceptable alignment after reduction and fixation of scaphoid fractures is not well defined. We systematically reviewed the literature to identify how scaphoid malunion is currently defined and by what parameters. METHODS A systematic review was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Multiple databases were searched for studies published in the English language that reported on outcomes after scaphoid malunion and included measurements to define malunions. Radiographic scaphoid measurement parameters were collected. Clinical outcome measures recorded included grip strength, wrist range of motion, and patient-reported outcome measures. Study quality was analyzed using the Methodological Index for Non-Randomized Studies (MINORS) criteria. Descriptive summaries of the studies are presented. RESULTS The initial search yielded 1600 articles. Ten articles (161 participants, 93% males, mean age = 28.3 + 6.3 years, mean MINORS score = 10.2 + 1.6) were included and analyzed. Scaphoid malunion was defined if the lateral intrascaphoid angle (LISA) was >45° (3 articles), LISA >35° (1 article), and height to length ratio >0.6 (3 articles). Four out of 5 studies found no significant associations between patient outcomes and degree of scaphoid malunion measured on imaging. CONCLUSIONS There is a lack of consensus for defining scaphoid malunion on imaging and absence of correlation between findings on imaging and patient outcomes. Future studies defining scaphoid malunion should be appropriately powered, incorporate measures of intrarater and interrater reliabilities for all reported imaging measurements, and utilize validated patient-reported outcome measures to reflect that malunion is associated with inferior outcomes meaningful to patients.
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Affiliation(s)
| | | | | | | | - Lauren M. Shapiro
- Stanford University, Redwood City, CA, USA
- Duke University, Durham, NC, USA
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Sharpe FE, McCarty CP, Goo C, Kim N, Park SH, Ebramzadeh E. Cross-Sectional Areas and Volumes Occupied by Implants in Simulated Scaphoid Fractures. J Hand Surg Am 2022; 47:228-236. [PMID: 34887135 DOI: 10.1016/j.jhsa.2021.10.019] [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] [Received: 02/22/2021] [Revised: 08/25/2021] [Accepted: 10/27/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE This study determined the volume of bone replaced by an implant at the proximal and distal poles of simulated scaphoid fractures. We also measured the cross-sectional area of the implant relative to the cross-sectional area of the scaphoid at 2 different simulated fracture locations. METHODS Microcomputed tomograhy scans of 7 cadaveric scaphoids were used to create 3-dimensional models in which transverse proximal pole and midwaist fractures were simulated. The volume occupied by 5 commonly used implants and the cross-sectional area occupied at the surface of the fractures was measured using a computer modeling software. RESULTS For simulated proximal pole fractures, the implants replaced 1.5%-7.4% of the fracture cross-sectional area and 1.2%-6.4% of the proximal fragment bone volume. For midwaist fractures, the implants replaced 1.5%-6.8% of the fracture cross-sectional area and 1.8%-4.6% of the proximal pole volume. Although the different implant designs replaced different areas and volumes, all these differences were small and below 4%. CONCLUSIONS This study provides data that relate to one aspect of fracture healing, specifically, the surface area occupied by 5 different implants in proximal and midwaist scaphoid fractures as well as the volume of bone replaced by the implant. CLINICAL RELEVANCE As opposed to the impression provided by 2-dimensional planar imaging, when studied using a 3-dimensional model, the volume and surface area replaced by an implant represent a minimal percentage of scaphoid bone, suggesting a negligible clinical effect.
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Affiliation(s)
- Frances E Sharpe
- Department of Hand and Orthopedic Surgery, Southern California Permanente Medical Group, Fontana Medical Center, Fontana, CA; Department of Orthopedic Surgery University of Southern California Keck School of Medicine, Fontana Medical Center, Fontana, CA.
| | - Colin P McCarty
- The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Orthopaedic Institute for Children and UCLA Department of Orthopaedic Surgery, Los Angeles, CA
| | - Connor Goo
- The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Orthopaedic Institute for Children and UCLA Department of Orthopaedic Surgery, Los Angeles, CA
| | - Nicolas Kim
- The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Orthopaedic Institute for Children and UCLA Department of Orthopaedic Surgery, Los Angeles, CA
| | - Sang-Hyun Park
- The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Orthopaedic Institute for Children and UCLA Department of Orthopaedic Surgery, Los Angeles, CA
| | - Edward Ebramzadeh
- The J. Vernon Luck, Sr., M.D. Orthopaedic Research Center, Orthopaedic Institute for Children and UCLA Department of Orthopaedic Surgery, Los Angeles, CA
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Akhbari B, Morton AM, Shah KN, Molino J, Moore DC, Weiss APC, Wolfe SW, Crisco JJ. In vivo articular contact pattern of a total wrist arthroplasty design. J Biomech 2021; 121:110420. [PMID: 33895657 PMCID: PMC8130596 DOI: 10.1016/j.jbiomech.2021.110420] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 02/26/2021] [Accepted: 03/25/2021] [Indexed: 11/20/2022]
Abstract
Total wrist arthroplasty (TWA) designs suffer from relatively high complication rates when compared to other arthroplasties. Understanding the contact pattern of hip and knee replacement has improved their design and function; however, the in vivo contact pattern of TWA has not yet been examined and is thus the aim of this study. We hypothesized that the center of contact (CoC) is located at the geometric centers of the carpal component and radial component in the neutral posture and that the CoC moves along the principal arcs of curvature throughout primary anatomical motions. Wrist motion and implant kinematics of six patients with the Freedom® total wrist implant were studied during various tasks using biplanar videoradiography. The location of the CoC of the components was investigated by calculating distance fields between the articular surfaces. We found the CoC at the neutral posture was not at the geometric centers but was located 3.5 mm radially on the carpal component and 1.2 mm ulnarly on the radial component. From extension to flexion, the CoC moved 10.8 mm from dorsal to volar side on the carpal component (p < 0.0001) and 7.2 mm from volar to dorsal on the radial component (p = 0.0009). From radial to ulnar deviation, the CoC moved 12.4 mm from radial to ulnar on the carpal component (p < 0.0001), and 5.6 mm from ulnar to radial on the radial component (p = 0.009). The findings of this study may eventually improve TWA success by advancing future designs through a more accurate understating of their kinematic performance in vivo.
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Affiliation(s)
- Bardiya Akhbari
- Center for Biomedical Engineering and School of Engineering, Brown University, Providence, RI 02912, United States.
| | - Amy M Morton
- Department of Orthopedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02903, United States.
| | - Kalpit N Shah
- Department of Orthopedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02903, United States.
| | - Janine Molino
- Department of Orthopedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02903, United States.
| | - Douglas C Moore
- Department of Orthopedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02903, United States.
| | - Arnold-Peter C Weiss
- Department of Orthopedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02903, United States; Division of Hand, Upper Extremity & Microvascular Surgery, Department of Orthopaedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02912, United States.
| | - Scott W Wolfe
- Hand and Upper Extremity Center, Hospital for Special Surgery, New York, NY 10021, United States; Weill Medical College of Cornell University, New York, NY 10021, United States.
| | - Joseph J Crisco
- Center for Biomedical Engineering and School of Engineering, Brown University, Providence, RI 02912, United States; Department of Orthopedics, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, Providence, RI 02903, United States.
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Padmore CE, Chan AHW, Langohr GDG, Johnson JA, Suh N. The Effect of Forearm Position on Wrist Joint Biomechanics. J Hand Surg Am 2021; 46:425.e1-425.e10. [PMID: 33303325 DOI: 10.1016/j.jhsa.2020.10.017] [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] [Received: 11/12/2019] [Revised: 08/02/2020] [Accepted: 10/14/2020] [Indexed: 02/02/2023]
Abstract
PURPOSE All active motion wrist joint simulators have been designed to simulate physiologic wrist motion; however, a main difference among them is the orientation of the forearm (horizontal or vertical with respect to gravity). Moreover, the effect of forearm orientation on experimental results has yet to be quantified, but it may be an important variable. Thus, the purpose of this study was to determine the effect of forearm orientation on wrist kinematics and contact mechanics. METHODS Eight cadaveric upper limbs were cycled through a flexion-extension motion using an active motion wrist simulator. Motion trials were performed in 3 forearm orientations (gravity-neutral, gravity-flexion, and gravity-extension). A computed tomography-based joint congruency technique was used to examine radiocarpal joint contact and joint contact centroid translation in the 3 tested orientations. RESULTS At full wrist extension and wrist flexion, radioscaphoid contact area was greatest in the gravity-extension orientation. Radiolunate contact area was similar among all 3 forearm orientations. The radioscaphoid contact centroid was consistent among the 3 tested positions with the wrist in neutral wrist position. In contrast, the radioscaphoid contact centroid translated radially in the gravity-neutral position relative to the gravity-flexion position in extreme extension. There were no differences in radiolunate centroid contact position in the 3 forearm orientations. CONCLUSIONS This study demonstrates that forearm orientation affects contact mechanics and end-range carpal kinematics. Future biomechanical studies should report forearm orientation and discuss the implication of the forearm orientation used on the experimental results. CLINICAL RELEVANCE This study provides evidence that the wrist joint is sensitive to forearm positions consistent with activities of daily living and rehabilitation protocols.
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Affiliation(s)
- Clare E Padmore
- Department of Biomedical Engineering, Roth-McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care Western University, London, Ontario, Canada
| | - Andrea H W Chan
- Division of Plastics, University Health Network University of Toronto, Toronto, Ontario, Canada; Division of Orthopaedic Surgery, Toronto Western Hospital Hand Clinic, University Health Network University of Toronto, Toronto, Ontario, Canada
| | - G Daniel G Langohr
- Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada
| | - James A Johnson
- Department of Mechanical and Materials Engineering, Roth-McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care Western University, London, Ontario, Canada
| | - Nina Suh
- Division of Orthopaedic Surgery, Roth-McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care Western University, London, Ontario, Canada; Department of Biomedical Engineering, Roth-McFarlane Hand and Upper Limb Centre, St. Joseph's Health Care Western University, London, Ontario, Canada.
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