Study on bone densities of tibial periprosthesis and contralateral interarticular compartment after unicompartment knee arthroplasty / 中国医师进修杂志

ABSTRACT

Objective To study the postoperative bone densities of tibial periprosthesis and contralateral interarticular compartment, in order to provide references and data for clinical application and complication prevention of unicompartment knee arthroplasty(UKA). Methods The study adopted a prospective study method.Thirty-eight patients with knee osteoarthritis involving medial interarticular compartment were selected, and all patients were treated with UKA. The alignment of operated limb before operation and 1 week,3 months,6 months and 12 months after operation was measured.The bone densities of tibial periprosthesis and contralateral tibial metaphysis 1 week,3 months,6 months and 12 months after operation were measured. Results All patients underwent successful surgery. No patient had loosening of prosthesis, sinking of prosthesis and revision events caused by various causes during follow-up.There was no statistical difference in alignment of operated limb 1 week,3 months,6 months and 12 months after operation compared with that before operation(P>0.01).The bone densities of tibial periprosthesis 3, 6 and 12 months after operation were significantly lower than those 1 week after operation (1.07 ± 0.05), (1.00 ± 0.04) and (0.99 ± 0.05) g/cm2vs. (1.15 ± 0.04) g/cm2, furthermore the bone densities 6 and 12 months after operation were significantly lower than those 3 months after operation,and there were statistical differences(P<0.01);but there was no statistical difference between 6 months after operation and 12 months after operation(P>0.01).There was no statistical difference in contralateral tibial metaphysis 3, 6 and 12 months after operation compared with that 1 week after operation(P>0.01).Conclusions Without fully alignment of operated limb correction,the bone density of tibial periprosthesis 1 year after UKA declines, but the bone density of contralateral interarticular compartment does not change significantly.