Total hip arthroplasty after arthrodesis of the hip joint

The results of 15 conversions of a hip arthrodesis into a total hip arthroplasty performed in the years 1980–¶1995 are reported. Fifteen patients (8 men, 7 women) underwent total hip arthroplasty 30.9 (range 2–61) years after spontaneous or operative fusion of a hip joint. The primary indications of the conversion were low-back pain ¶(n = 10), knee pain (n = 2) and hip problems (n = 3). At follow-up examination 5.4 (range 2–13.3) years postoperatively, the Harris Hip Score averaged 86.0 (range 70.1–¶99.0). Six patients were pain-free, 7 had less pain, 2 felt no improvement of pain. All patients confirmed that they would undergo the operation again. The Trendelenburg sign was negative or mild in 8 patients and moderate to severe in 7. Aseptic loosening of 2 stems (1 cemented, 1 cementless) and 2 deep infections required revision surgery. We conclude that this operation can lead to satisfactory results even after a long duration of the arthrodesis. However, full function with no pain and a negative Trendelenburg sign could be obtained in only 20% (3/15) of the cases.