Bone mineral density changes after total knee arthroplasty: one-year follow-up.
The study involved analysis of differences in bone mineral density (BMD) in the region of knee arthroplasty in 106 female patients. BMD was assessed using dual-energy X-ray absorptiometry in a follow-up time schedule: before surgery and 2 weeks postoperatively (baseline), 5, 12, 24, and 48 weeks after knee joint arthroplasty. Four assessment regions A, B, C, and D were determined in immediate proximity to the arthroplasty site. A year after surgery, a decrease in BMD was observed in all determined regions-(9.9%, 13.8%, 9.9%, and 7.6% respectively) in comparison with the baseline value. The most significant BMD decrease was observed in the period between 5 and 12 weeks after the knee joint arthroplasty. In our opinion, the decrease in BMD at the knee joint arthroplasty site is a result of the postoperative increased bone resorption and decreased patient motor activity.
Gazdzik
Tadeusz S
TS
Ortopaedics Clinic of Silesian Medical University, Katowice, Poland.
Gajda
Tomasz
T
Kaleta
Marek
M
D015502:Absorptiometry, Photon; D019645:Arthroplasty, Replacement, Knee; D015519:Bone Density / Q000502:physiology*; D016723:Bone Remodeling / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D017698:Postmenopause