Table 1.

Demographic data

Diagnosis	Hips (%)
Osteonecrosis of the femoral head	51 (56%)
Arthritis secondary to dysplasia of the hip	17 (18.7%)
Primary arthritis of the hip	13 (14.3%)
Ankylosing spondylitis	6 (6.6%)
Rheumatoid arthritis	1 (1.1%)
Arthritis secondary to hip pyogenic arthritis in childhood	1 (1.1%)