TABLE II.

Results of Micro-Computed Tomography Analysis of the Tibial Tunnels^*

	Time Zero	Immobilization	Immediate Loading	Early Delayed Loading (Postop. Day 4)	Late Delayed Loading (Postop. Day 10)
2 weeks
New-bone volume (mm3)	0.82 ± 0.04	0.85 ± 0.19	0.89 ± 0.30	1.60 ± 0.54†	1.47 ± 0.11†
Tissue mineral content (mg)	0.45 ± 0.03	0.48 ± 0.12	0.49 ± 0.15	1.05 ± 0.38‡	0.97 ± 0.09‡
Tissue mineral density (mg/mL)	543 ± 25	542 ± 32	536 ± 40	639 ± 16‡	643 ± 21‡
4 weeks
New-bone volume (mm3)	0.82 ± 0.04	0.88 ± 0.28	0.61 ± 0.09	1.32 ± 0.19§	1.44 ± 0.45‡
Tissue mineral content (mg)	0.45 ± 0.03	0.49 ± 0.17	0.37 ± 0.08	0.92 ± 0.13‡	1.03 ± 0.34‡
Tissue mineral density (mg/mL)	543 ± 25	534 ± 40	575 ± 39	684 ± 27†	706 ± 18†

^*The values are given as the mean and standard deviation.

^†P < 0.003 compared with the immobilization and immediate-loading groups.

^‡P < 0.001 compared with the immobilization and immediate-loading groups.

^§P < 0.01 compared with the immobilization and immediate-loading groups.