Does mild flexion of the femoral prosthesis in total knee arthroplasty result in better early postoperative outcomes?

Table 3 Comparison of ROM before and after surgery and between groups (\(\overline{\mathrm x}\) ± s, °)

	Anterior extension group	Mildly flexed group	Moderately flexed group	Excessively flexed group	F	P value
Number	21	41	32	19	-	-
Pre-op	109.53 ± 10.48	108.56 ± 12.03	109.70 ± 12.59	104.89 ± 12.31	0.732	0.535
2 weeks post-op	91.86 ± 7.63	92.92 ± 9.72	95.26 ± 8.96	94.26 ± 7.86	0.762	0.518
1 month post-op	102.72 ± 11.17	106.79 ± 9.34	110.09 ± 8.68^*	109.40 ± 9.37^a	2.873	0.040
3 months post-op	109.15 ± 7.83	115.58 ± 8.51^*	115.17 ± 8.08^a	113.83 ± 9.42	3.006	0.033
6 months post-op	114.70 ± 9.30	120.92 ± 7.20^*	119.44 ± 8.68^a	116.28 ± 8.08	3.303	0.023
1 year post-op	116.93 ± 8.05	123.46 ± 6.51^*	121.07 ± 8.36	118.76 ± 8.20	3.919	0.011
F	42.895	119.445	58.449	41.705	-	-
P value	0.000	0.000	0.000	0.000	-	-

ROM Knee range of motion
^*, ^a indicates statistically significant differences between two groups at the same time point (P < 0.05)
At 1 month postoperatively, ^*P = 0.007 compared to the anterior extension group and ^aP = 0.029 compared to the anterior extension group
At 3 months postoperatively, ^*P = 0.005 compared to the anterior extension group and ^aP = 0.012 compared to the anterior extension group
At 6 months postoperatively, ^*P = 0.006 compared to the anterior extension group, P = 0.044 compared to the excessively flexed group, and ^aP = 0.042 compared to the anterior extension group
At 1 year postoperatively, ^*P = 0.002 compared to the anterior extension group, and P = 0.029 compared to the excessively flexed group

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