1. Uncemented femoral revision arthroplasty using a modular tapered, fluted titanium stem.
- Author
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Wirtz, Dieter C, Gravius, Sascha, Ascherl, Rudolf, Thorweihe, Miguel, Forst, Raimund, Noeth, Ulrich, Maus, Uwe M, Wimmer, Matthias D, Zeiler, Günther, and Deml, Moritz C
- Subjects
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ANALYSIS of variance , *CONFIDENCE intervals , *ORTHOPEDIC apparatus , *MEDICAL cooperation , *PROSTHETICS , *REOPERATION , *RESEARCH , *RESEARCH funding , *STATISTICS , *T-test (Statistics) , *TITANIUM , *DATA analysis , *TOTAL hip replacement , *PRE-tests & post-tests , *RETROSPECTIVE studies , *DATA analysis software , *DESCRIPTIVE statistics , *KAPLAN-Meier estimator - Abstract
Background and purpose -- Due to the relative lack of reports on the medium- to long-term clinical and radiographic results of modular femoral cementless revision, we conducted this study to evaluate the medium- to long-term results of uncemented femoral stem revisions using the modular MRP-TITAN stem with distal diaphyseal fixation in a consecutive patient series. Patients and methods -- We retrospectively analyzed 163 femoral stem revisions performed between 1993 and 2001 with a mean follow-up of 10 (5-16) years. Clinical assessment included the Harris hip score (HHS) with reference to comorbidities and femoral defect sizes classified by Charnley and Paprosky. Intra-operative and postoperative complications were analyzed and the failure rate of the MRP stem for any reason was examined. Results -- Mean HHS improved up to the last follow-up (37 (SD 24) vs. 79 (SD 19); p < 0.001). 99 cases (61%) had extensive bone defects (Paprosky IIB-III). Radiographic evaluation showed stable stem anchorage in 151 cases (93%) at the last follow-up. 10 implants (6%) failed for various reasons. Neither a breakage of a stem nor loosening of the morse taper junction was recorded. Kaplan-Meier survival analysis revealed a 10-year survival probability of 97% (95% Cl: 95-100). Interpretation -- This is one of the largest medium- to long-term analyses of cementless modular revision stems with distal diaphyseal anchorage. The modular MRP-TITAN was reliable, with a Kaplan-Meier survival probability of 97% at 10 years. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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