Abstract
The purpose of this study was to examine the correlation between lumbosacral spinal instability and pelvic inclination in patients with osteoarthritis of the hip.One hundred patients (9 males and 91 females, mean age 66) treated by total hip arthroplasty were investigated. The lumbosacral spinal instability was found in 43patients (43%).In the affected individuals, flexion contracture of the hip joint and pelvic anteversion occurred, but lumbar lordorsis and sagittal alignment did not change. The percentages of Crowe classification types Ⅲ and Ⅳ in the patients with lumbosacral spinal instability were significantly higher than those in the patients with no instability. Our results suggest that lumbar lordosis compensates for lumbosacral instability during the correction of sagittal alignment.
