Table 2.

Comparison of the maximum value and range of motion of the 6 degrees of freedom of the knee joint in the FB and MB groups of patients after surgery and the healthy control group.

Group	Healthy control group	FB group	MB group	p1	p2
N	15	15	15
Varus/valgus angle	−10.36 ​± ​2.17/5.97 ​± ​1.50	−9.49 ​± ​5.99/5.43 ​± ​1.01	−9.64 ​± ​4.83/5.01 ​± ​1.93	0.096	0.052
Internal/external rotation	−5.93 ​± ​3.56/11.74 ​± ​2.69	−5.77 ​± ​3.42/10.75 ​± ​3.03	−7.54 ​± ​4.51/11.48 ​± ​4.38	0.007	0.081
Flexion/extension angle	55.91 ​± ​3.36/50.82 ​± ​4.35	46.11 ​± ​4.14/40.13 ​± ​4.14	49.33 ​± ​3.98/45.82 ​± ​3.76	≤0.001	≤0.001
Anterior-posterior displacement	0.78 ​± ​0.57/1.36 ​± ​0.37	0.71 ​± ​0.35/0.85 ​± ​0.32	0.75 ​± ​0.89/0.72 ​± ​0.64	0.359	0.001
Superior-inferior displacement	1.37 ​± ​0.31/1.68 ​± ​0.32	1.31 ​± ​0.37/0.78 ​± ​0.43	1.28 ​± ​0.43/0.84 ​± ​0.21	0.430	≤0.001
Medial-lateral displacement	0.43 ​± ​0.31/1.07 ​± ​0.37	0.41 ​± ​0.13/0.41 ​± ​0.13	0.46 ​± ​0.47/0.64 ​± ​0.73	0.643	≤0.001

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/range of motion; 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: intergroup difference in maximum value, <0.05 indicates statistical significance; p²: intergroup difference in range of motion, <0.05 indicates statistical significance