人工骨頭置換術後のステム周囲の骨塩定量法について -OMNIFIT と OMNIFLEX の術後-

抄録

Bone mineral densities (BMDs) around the stem of bipolar hip prostheses (OMNIFLEX or OMNIFIT) were measured in 41 hips of 33 patients by dual energy x-ray absorptiometry.
Among 19 cases of OMNIFLEX (average 14 months after surgery) BMDs were higher in patients 1 year and over affter surgery than in those less than 1 year. The results suggest that active bone formation occurs around the stem about 1 year after surgery.
Among 22 cases of OMNIFIT (average 45 months after surgery) no difference was found between BMDs of patients over 3 years after surgery and those less than 3 years which implies that the bone around the stem was already balanced before 3 years after surgery. The tip of the stem showed the highest BMD.