Table 4.

Comparison of the range of motion of the 6 degrees of freedom of the knee joint in the FB and MB groups before and after surgery.

Group	FB group		MB group		p1	p2
Status	Before surgery	After surgery	Before surgery	After surgery
Varus/valgus angle	4.91 ​± ​1.34	5.43 ​± ​1.01	4.79 ​± ​1.72	5.01 ​± ​1.93	0.083	0.118
Internal/external rotation	12.05 ​± ​3.88	10.75 ​± ​3.03	9.06 ​± ​5.75	11.48 ​± ​4.38	0.037	≤0.001
Flexion/extension angle	36.17 ​± ​6.07	40.13 ​± ​4.14	37.09 ​± ​3.93	45.82 ​± ​3.76	≤0.001	≤0.001
Anterior-posterior displacement	0.71 ​± ​0.92	0.85 ​± ​0.32	0.66 ​± ​0.39	0.72 ​± ​0.64	0.016	0.055
Superior-inferior displacement	0.81 ​± ​0.74	0.78 ​± ​0.43	0.88 ​± ​0.21	0.84 ​± ​0.21	0.727	0.694
Medial-lateral displacement	0.45 ​± ​0.21	0.41 ​± ​0.13	0.52 ​± ​0.91	0.64 ​± ​0.73	0.287	0.025

FB ​= ​fixed-bearing prosthesis group; MB ​= ​mobile-bearing prosthesis group.

Motion angle (°,$\overline{\text{x}}$±s), displacement (cm,$\overline{\text{x}}$±s); degrees of freedom data: range of motion; p¹: differences before and after surgery in the FB group, <0.05 indicates statistical significance; p²: differences before and after surgery in the MB group, <0.05 indicates statistical significance