Bone loss around 2 different types of hip prostheses.
Dual energy x-ray absorptiometry (DXA) allows the measurement of bone mineral density (BMD) around an uncemented hip prosthesis. The aims of this study were: 1) to determine the reproducibility of periprosthetic BMD measurements; 2) to delineate the time course of bone loss that occurs after insertion of a hip prosthesis; and 3) to compare the bone loss around two different types of hip prosthesis. We studied 20 patients: 11 had Bateman and 9 had porous-coated anatomic prostheses inserted. The mean bone loss in 20 patients between 6 and 52 weeks after surgery was 6%. The greatest loss during this period was 18% and occurred from the proximal medial cortex. We conclude that measurement of periprosthetic bone mass by DXA is a precise technique. Bone loss was rapid in the first 6 months following total hip replacement. There was no difference in the bone loss occurring around the two prostheses studied.
Spittlehouse
A J
AJ
Bone and Joint Research Unit, Nether Edge Hospital, Sheffield, United Kingdom.
Smith
T W
TW
Eastell
R
R
D015502:Absorptiometry, Photon; D000368:Aged; D000704:Analysis of Variance; D019540:Area Under Curve; D015519:Bone Density; D005260:Female; D005269:Femur / Q000473:pathology*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000601:surgery; D011474:Prosthesis Design; D012044:Regression Analysis; D015203:Reproducibility of Results