Scientific Article   |    
Clinical and Radiographic Analysis of the Mallory-Head Femoral Component in Revision Total Hip Arthroplasty A Minimum 8.8-Year and Average Eleven-Year Follow-up Study
Roger H. EmersonJr., MD; William C. Head, MD; Linda L. Higgins, PhD
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Investigation performed at the Texas Center for Joint Replacement, Plano, Texas

Roger H. Emerson Jr., MD
William C. Head, MD
Linda L. Higgins, PhD
Texas Center for Joint Replacement, 5940 West Parker Road, Suite 100, Plano, TX 75093. E-mail address for R.H. Emerson Jr.: rhemersonjr@msn.com

The authors did not receive grants or outside funding in support of their research or preparation of this manuscript. One or more of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity (Biomet). No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

J Bone Joint Surg Am, 2003 Oct 01;85(10):1921-1926
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Background: Although many designs of cementless femoral stems are available for revision hip arthroplasty, there is no consensus about which design features are required to achieve an optimal clinical outcome and maximum preservation of bone. The purpose of this study was to report the clinical and radiographic results for a specific design.

Methods: A selected series of 107 revision total hip arthroplasties with use of the Mallory-Head calcar-replacement prosthesis was reviewed with clinical and radiographic evaluation. The study group consisted of sixty-six hips (sixty patients), with an average follow-up of 11.5 years (range, 8.8 to 14.5 years). All revisions in this series were performed because of failure of a cemented or cementless femoral component of standard length. All revision stems were 220 mm long.

Results: Three of the 107 original stems demonstrated subsidence of 3, 7, and 9 mm. Two stems had definite loosening, resulting in a 1.9% rate of mechanical failure. The rate of survival was 94% with revision for any reason as the end point and 97.1% with revision because of mechanical failure (aseptic loosening) as the end point. The Harris clinical score was 49 points preoperatively and 80 points postoperatively. Radiographic analysis demonstrated that the average percentage of the diaphysis filled by the prosthesis was 86%. Fifty-four (88.5%) of the sixty-one hips with complete radiographic follow-up showed no stress-shielding on final radiographs, whereas seven hips (11.4%) showed some stress-shielding.

Conclusions: This proximal load-bearing calcar-replacement design achieves reliable fixation and stability at intermediate-term follow-up. There is no deterioration in the clinical outcome or radiographic findings at an average of eleven years of follow-up. The prevalence of disuse osteopenia from stress-shielding is very low. Proper surgical technique includes maximum fill of the diaphysis of the femur, with contact of the collar on part of the proximal aspect of the femoral shaft.

Level of Evidence: Therapeutic study, Level IV (case series [no, or historical, control group]). See Instructions to Authors for a complete description of levels of evidence.

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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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