Better quadriceps and hamstring strength is achieved after Total knee Arthroplasty with single radius femoral prostheses: a retrospective study based on isokinetic and isometric data

Li, Mengyuan; Zhang, Lei; Zhang, Ruiying; Ma, Yuanchen; Liao, Junxing; Li, Qingtian; Deng, Zhantao; Zheng, Qiujian

doi:10.1186/s42836-020-0022-4

Table 3 Isokinetic and isometric parameters (mean ± SD) between groups before and after TKA

From: Better quadriceps and hamstring strength is achieved after Total knee Arthroplasty with single radius femoral prostheses: a retrospective study based on isokinetic and isometric data

velocity	parameters	Preoperative			Postoperative
velocity	parameters	MR group	SR group	P value	MR group	SR group	P value
180°/s	Peak knee flexion torque (N.m)	17.45 ± 8.35	19.13 ± 5.67	0.498	25.25 ± 9.97	39.50 ± 19.20	0.014
	Peak knee extension torque (N.m)	23.60 ± 15.95	26.94 ± 8.34	0.454	38.05 ± 17.07	54.88 ± 28.29	0.034
	H/Q ratio	0.81 ± 0.20	0.73 ± 0.16	0.177	0.77 ± 0.42	0.74 ± 0.15	0.809
	Maximum knee flexion work (J)	15.30 ± 3.16	17.44 ± 7.46	0.018	19.95 ± 8.61	30.75 ± 14.72	0.016
	Maximum knee extension work (J)	19.60 ± 6.83	23.63 ± 8.63	0.127	36.80 ± 19.33	50.25 ± 26.66	0.088
	Average knee flexion power (W)	20.75 ± 10.04	26.63 ± 12.18	0.122	28.95 ± 17.60	44.38 ± 33.07	0.106
	Average knee extension power (W)	32.45 ± 11.14	35.88 ± 13.15	0.403	55.40 ± 31.96	70.13 ± 52.31	0.305
60°/s	Peak knee flexion torque (N.m)	32.90 ± 9.61	36.31 ± 11.61	0.802	32.70 ± 11.04	49.3 ± 23.66	0.017
	Peak knee extension torque (N.m)	47.40 ± 21.38	59.69 ± 19.66	0.085	52.75 ± 25.05	76.31 ± 34.96	0.032
	H/Q ratio	0.60 ± 0.25	0.63 ± 0.34	0.689	0.76 ± 0.46	0.67 ± 0.17	0.421
	Maximum knee flexion work (J)	34.95 ± 8.99	34.19 ± 10.93	0.468	28.15 ± 10.01	42.38 ± 16.55	0.006
	Maximum knee extension work (J)	46.45 ± 21.85	60.38 ± 18.95	0.052	52.05 ± 28.48	70.50 ± 28.89	0.063
	Average knee flexion power (W)	15.35 ± 5.89	17.56 ± 6.02	0.275	18.75 ± 8.68	36.31 ± 25.85	0.018
	Average knee extension power (W)	31.70 ± 5.68	33.19 ± 9.79	0.728	35.15 ± 24.86	60.81 ± 42.46	0.043
Isometric contraction	Knee flexion torque (N.m)	36.75 ± 12.67	40.81 ± 12.80	0.348	51.00 ± 19.74	70.38 ± 37.76	0.077
Isometric contraction	Knee extension torque (N.m)	49.00 ± 18.95	52.62 ± 18.07	0.036	57.90 ± 28.69	94.69 ± 46.38	0.011

SD standard deviation, TKA total knee arthroplasty, SR single radius, MR multiple radius, H/Q hamstring/Quadriceps

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ISSN: 2524-7948

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