FEMORAL REMODELING AFTER ARTHROPLASTY OF THE HIP - PROSPECTIVE RANDOMIZED 5-YEAR COMPARISON OF 120 CEMENTED UNCEMENTED CASES OF ARTHROSIS

We compared radiographically the femurs for 5 years after cemented (Landos Titane) and uncemented (Zweymuller/Endler) hip arthroplasty (THA) for coxarthrosis in 120 patients. The bone changes followed a characteristic time-course with rapid initial remodeling and almost no further changes after 3-4 years. No association between bone changes and clinical results was found. The groups did not differ in bone atrophy and ectoPiC bone formation, whereas the incidence of distal cortical hypertrophy and proximal radio-opaque double line was higher around uncemented stems. The age and body weight of the patients and the stem size did not affect the bone changes, but women with uncemented stems developed more bone atrophy than did men.