Surgical notes stated that the tha was for right hip degenerative joint disease.This was the second hip revision at this time for the pt.The acetabular shell was slightly retroverted during the trial range of motion.The shell was removed and repositioned.The final tha reduction was found to be stable in all physiologic positions.No complication noted.Post operative notes stated that the pt was having pain typically over the right groin.During the range of motion eval, the slight groin pain was noted on the right extremes of coupled flexion and internal rotation or extreme abduction.X-ray comparison over the last 3 years showed that the acetabular component had shifted a few degrees vertically.No windshield wiper ring around screws was noted and no significant radiolucent lines shown.The surgeon thinks that the acetabular shell may have fibrous in-growth instead of bony in-growth, which may lead to micro-motion in certain activities.With the info provided, a definitive root cause cannot be determined.Mfg records were reviewed and found to be conforming to the requirements at the time of manufacture.
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