Table 3.

Comparison of the maximum value 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	−15.13 ​± ​6.78	−9.49 ​± ​5.99	−13.28 ​± ​3.98	−9.64 ​± ​4.83	≤0.001	≤0.001
Internal/external rotation	−8.28 ​± ​4.83	−5.77 ​± ​3.42	−9.46 ​± ​4.99	−7.54 ​± ​4.51	≤0.001	≤0.001
Flexion/extension angle	43.15 ​± ​3.77	46.11 ​± ​4.14	44.62 ​± ​5.92	49.33 ​± ​3.98	≤0.001	≤0.001
Anterior-posterior displacement	0.26 ​± ​0.74	0.71 ​± ​0.35	0.33 ​± ​0.79	0.75 ​± ​0.89	≤0.001	≤0.001
Superior-inferior displacement	1.21 ​± ​0.67	1.31 ​± ​0.37	1.31 ​± ​0.61	1.28 ​± ​0.43	0.177	0.137
Medial-lateral displacement	0.44 ​± ​0.24	0.41 ​± ​0.13	0.39 ​± ​0.26	0.46 ​± ​0.47	0.792	0.534

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: maximum value; Varus-valgus angle: negative value-positive value; internal rotation-external rotation: negative value-positive value; anterior-posterior displacement:positive value-negative value; superior-inferior displacement:positive value-negative value; medial-lateral displacement: negative value-positive value; 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