Prospective Five-Year Subsidence Analysis of a Cementless Fully Hydroxyapatite-Coated Femoral Hip Arthroplasty Component

Author:

Clauss Martin1,Van Der Straeten Catherine2,Goossens Marc3

Affiliation:

1. Clinic for Orthopaedics and Trauma Surgery, Kantonsspital Baselland, Liestal - Switzerland

2. Orthopaedics Department, University Hospital, Gent - Belgium

3. Maria Middelares Hospital, Gent - Belgium

Abstract

Early subsidence >1.5 mm is considered to be a predictive factor for later aseptic loosening of the femoral component following total hip arthroplasty (THA). The aim of this study was to assess five-year subsidence rates of the cementless hydroxyapatite-coated twinSys® stem (Mathys Ltd., Bettlach, Switzerland). This prospective single-surgeon series examined consecutive patients receiving a twinSys® stem at Maria Middelares Hospital, Belgium. Patients aged >85 years or unable to come to follow-up were excluded. Subsidence was assessed using Ein Bild Roentgen Analyse – Femoral Component Analysis (EBRA-FCA). Additional clinical and radiographic assessments were performed. Follow-ups were prospectively scheduled at two, five, 12, 24, and 60 months. In total, 218 THA (211 patients) were included. At five years, mean subsidence was 0.66 mm (95% CI: 0.43-0.90). Of the 211 patients, 95.2% had an excellent or good Harris Hip Score. There were few radiological changes. Kaplan-Meier analysis indicated five-year stem survival to be 98.4% (95% CI: 97.6-100%). Subsidence levels of the twinSys® femoral stem throughout the five years of follow-up were substantially lower than the 1.5 mm level predictive of aseptic loosening. This was reflected in the high five-year survival rate.

Publisher

SAGE Publications

Subject

Orthopedics and Sports Medicine,Surgery

Reference32 articles.

1. HolzwarthU CotognoG Total Hip Arthroplasty. Brussels European Commission 2012

2. National Institute for Clinical Excellence Guidence on the Selection of Prostheses for Primary Total Hip Replacement. London UK National Health Service 2000

3. Total Hip Arthroplasty for Primary Osteoarthritis in Patients Fifty-five Years of Age or Older

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