Article

OBJECTIVE: To investigate whether a postoperative weight-bearing regimen affects
changes in bone mineral density and body composition after uncemented total hip
arthroplasty, and to investigate the changes over a 5-year period after the
surgical procedure. DESIGN: Secondary analysis of a previous randomized
controlled trial. METHODS: A total of 39 patients were randomized to immediate
full weight-bearing or partial weight-bearing for 3 months. Dual-energy X-ray
absorptiometry was used to measure bone mineral density of the contralateral hip
and both heels and to measure body composition. RESULTS: The weight-bearing
regimen had no effect on change in bone mineral density or body composition after
3 and 12 months. At 5 years, there was a decrease in bone mineral density of 3%
in the total body and 2-3% in the contralateral hip regions. At 5 years we found
a decrease in total body bone mineral content of 5%, but no changes in fat mass
or lean mass compared with preoperative values. CONCLUSION: The postoperative
weight-bearing regimen had no effect on changes in body composition or bone
mineral density. Five years after total hip arthroplasty there was a decrease in
bone mineral content and bone mineral density, but no changes in lean mass or fat
mass.

Langue : ANGLAIS