Abstract
With reference to secondary hip-spine syndrome, pelvic inclination before total hip arthroplasty (THA) was investigated in 50 patients with osteoarthritis of the hip. The degree of pelvic inclination was estimated according to two methods, one the Doiguchi method using antero-posterior radiographs of the hip joint and pelvis (pelvic inclination index), and the other the method of Jackson using lateral radiographs of the hip joint to lumbar spine (pelvic angle). Pelvic inclination index decreased and pelvic angle increased with advancing age, or equivalently, the pelvis retroverted with age. There was a close correlation between pelvic inclination index and pelvic angle (R² =0.6264), suggesting that the pelvic inclination index measured based on antero-posterior radiographs of the hip joint may help estimate sagittal spinopelvic alignments. When performing THA on patients with severe pelvic retroversion, it may be necessary to place an acetabular socket in prospect of standing position or pelvic inclination in the future.
