Abstract
In the present study, changing in pelvic inclination before total hip arthroplasty (THA) were investigated using 59 patients with osteoarthritis of the hip. The subjects were divided into following four groups by their age: Group A consisted of 21 patients between 45 and 54 years, Group B 10 patients between 55 and 64, Group C 18 patients between 65 and 74, and Group D 10 patients at 75 years or older. Pelvic inclination became retroverted with age, further retroverting at the standing position especially in elderly people. When performing THA on patients with severe pelvic retroversion, alignments of the lumber spine, pelvis, and hip should be carefully considered. Insertion of acetabular socket should be considered in some cases taking into account standing position or pelvic inclination in future. In elderly people with lumbar degenerative kyphosis and severe pelvic retroversion, it was important to insert the acetabular socket in prospect of future changes of the pelvis inclination since the pelvis retroverts according to posture and age.
