Abstract
Background
Acetabular osteophytes are common findings during total hip arthroplasty (THA).
Purpose
This study was designed to determine the extent to which osteophytes may limit range of motion (ROM) and in which locations impingement is likely to occur if osteophytes are not removed during surgery.
Methods
Computer-aided design was used to compare ROM of a modern hip implant in four cadaver models with and without 10-mm acetabular rim osteophytes added. A clock face, with 12 o’clock at the superior pole of the right acetabulum, was used to map impingement.
Results
The osteophyte model limited ROM in flexion (101° v. 113°, p = 0.03), 90° of flexion with internal rotation (16.7° v. 31.6°, p = 0.01), and external rotation (30.4° v. 49.5°, p = 0.01). Impingement occurred between 7 and 8 o’clock in external rotation and 1 and 2 o’clock in the other two motions.
Conclusions
Osteophytes in these positions have the greatest impact on ROM and should be removed during THA.
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Acknowledgments
This study was partially funded by the generous donation of Dr. Alberto Foglia and his wife Maria Pia. Study was supported by a grant from Stryker Orthopedics.
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Conflict of Interest:
Sebastian Rodriguez-Elizalde, MD, Alyssa M. Yeager, BA, Bheeshma Ravi, MD, Eduardo A. Salvati, MD have declared that they have no conflict of interest. Geoffrey H. Westrich, MD received research grant from Stryker Orthopedics in support of the study; is a paid consultant for Stryker Orthopedics, outside the work. Joseph D. Lipman, MS is a paid consultant for Ivy Sport Medicine; employee of Hospital for Special Surgery; has the following patents: Posterior Stabilized Knee Prosthesis, Self-aligning knee prosthesis, Dual radius glenoid prosthetic component for total shoulder arthroplasty, Pelvic Positioner, Trochlear Clamp, Patella Resection Drill and Prosthesis Implantation Device; has pending patents for Constrained Condylar Knee Device, Prosthetic Condylar Joints With Articulating Bearing Surfaces Having A Translating Contact Point During Rotation Thereof, Elbow Replacement Apparatus And Methods, Expanding Cannula And Retractor Device And Methods Of Use and External fixation devices and methods of use; receives royalties payment from Mathys Inc. and Ortho Development Corp; has received travel support for travel to meetings from Chinese Orthopaedic Association, outside the work.
Human/Animal Rights:
This article does not contain any studies with human or animal subjects performed by the any of the authors.
Informed Consent:
Informed consent was obtained from all patients for being included in the study.
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Rodriguez-Elizalde, S., Yeager, A.M., Ravi, B. et al. Computerized Virtual Surgery Demonstrates Where Acetabular Rim Osteophytes Most Reduce Range of Motion Following Total Hip Arthroplasty. HSS Jrnl 9, 223–228 (2013). https://doi.org/10.1007/s11420-013-9337-9
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DOI: https://doi.org/10.1007/s11420-013-9337-9