Risk Factors for Subsidence of a Modular Tapered Femoral Stem Used for Revision Total Hip Arthroplasty.

Journal of Arthroplasty

PubMedID: 25701193

Tangsataporn S, Safir OA, Vincent AD, Abdelbary H, Gross AE, Kuzyk PR. Risk Factors for Subsidence of a Modular Tapered Femoral Stem Used for Revision Total Hip Arthroplasty. J Arthroplasty. 2015;30(6):1030-4.
The purpose of this study was to determine the incidence, and the clinical and radiographic risk factors for significant subsidence of a cementless, modular tapered revision femoral stem. Femoral stem subsidence of at least 10 mm or subsidence requiring revision was considered significant subsidence. Ninety-seven patients (99 hips) were included with minimum radiographic follow-up of one year (mean 34 months; range, 12-91 months). The mean stem subsidence was 4. 5 mm (range, 0-44 mm). Fourteen out of 99 (14. 1%) stems had significant subsidence and 6 (6. 1%) stems required revision due to subsidence. PATIENT
weight greater than 80 kg (P=0.04) and femoral stem press-fit distance of less than 2 cm (P<0. 01) were both independent risk factors for significant stem subsidence.