According to a study published in the June issue of The Journal of Arthroplasty concomitant spinal deformity may be linked to total hip arthroplasty (THA) instability. The researchers used standing stereoradiography to evaluate spinopelvic parameters, acetabular cup anteversion, and inclination of 139 THAs among 107 patients with sagittal spinal deformity. 

They found that the rate of THA dislocation was 8.0 percent, with a revision rate of 5.8 percent for instability. Overall, patients who sustained dislocations had significantly higher spinopelvic tilt, T1-pelvic angle, and mismatch of lumbar lordosis and pelvic incidence. The researchers note that among dislocating THA, 80 percent had safe anteversion, 80 percent had safe inclination, and 60 percent had both parameters within the safe zone. Learn more...