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Table 1 The relationship of gender, age, and percentage of patients to hip disease, in the NHI research database 1996–2004.

From: Incidence of hip replacement among national health insurance enrollees in Taiwan

  All primary operations including partial and total hip replacement (94,182)
Hip disease Number (%) Men (%) Age < 60 years (%) Mean age in years
Femoral neck fractures 40143 (42.6) 35 4.5 76
Avascular necrosis 28053 (29.8) 81 76.6 49
Osteoarthrosis 16380 (17.4) 43 41.6 60
Malunion and nonunion of fracture 1273 (1.4) 52 37.2 65
Rheumatoid arthritis 510 (0.5) 21 58 55
Pathologic fracture 370 (0.4) 35 23 68
Congenital anteversion of femur 349 (0.4) 20 68 52
Ankylosing spondylitis 314 (0.3) 93 92 40
Pyogenic arthritis 212 (0.2) 67 65 52
Congenital dislocation 127 (0.1) 16 87 41
Other 6451 (6.8)