Table 5.

Comparison of preoperative and postoperative BMD in Zone 3

Knee/time of measurement	Number	BMD value*	p Value†
Operated knee
Preoperative	42	1.12 (0.19)	0.005
2 months	42	1.04 (0.22)
Preoperative	34	1.12 (0.20)	0.06
12 months	34	1.02 (0.31)
Preoperative	21	1.14 (0.24)	0.136
24 months	21	1.06 (0.31)
Nonoperated knee
Preoperative	39	1.12 (0.16)	0.52
2 months	39	1.11 (0.15)
Preoperative	30	1.13 (0.15)	0.47
12 months	30	1.12 (0.17)
Preoperative	18	1.12 (0.17)	0.47
24 months	18	1.10 (0.17)

* Values are expressed as mean, with SD in parentheses; ^†paired t test; BMD = bone mineral density.