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Table 3 Isokinetic strength and endurance in quadriceps and hamstring

From: Changes in hamstring strength after anterior cruciate ligament reconstruction with hamstring autograft and posterior cruciate ligament reconstruction with tibialis allograft

 PreoperativePostoperative 2 year
ACLRPCLRP valueACLRPCLRP value
60°/sQuadriceps peak torque, N∙mInvolved66.5 ± 35.575.2 ± 45.10.430100.1 ± 33.7104.6 ± 44.10.748
Uninvolved108.2 ± 35.6100.0 ± 39.80.428114.3 ± 33.8121.7 ± 52.10.625
Hamstring peak torque, N∙mInvolved52.7 ± 27.049.5 ± 24.40.65973.7 ± 22.171.3 ± 31.90.802
Uninvolved70.4 ± 25.466.7 ± 28.50.61778.4 ± 26.681.9 ± 27.80.727
Torque deficit in the involved leg compared to uninvolved leg (%)Quadriceps36.4 ± 34.625.5 ± 31.80.2539.8 ± 24.519.4 ± 29.10.328
Hamstring21.9 ± 37.425.4 ± 27.50.7231.9 ± 23.921.8 ± 14.00.017
Hamstring to quadriceps ratioInvolved0.82 ± 0.200.73 ± 0.280.1570.79 ± 0.310.80 ± 0.190.982
Uninvolved0.66 ± 0.130.70 ± 0.190.3840.70 ± 0.160.80 ± 0.320.227
Work, JInvolved473.8 ± 278.6433.7 ± 269.70.604695.0 ± 237.0578.2 ± 350.70265
Uninvolved756.7 ± 308.1709.4 ± 264.90.566819.0 ± 225.8812.5 ± 325.10.947
120°/sQuadriceps peak torque, N∙mInvolved56.8 ± 288561.4 ± 36.70.61377.0 ± 28.273.4 ± 35.20.752
Uninvolved79.5 ± 32.072.5 ± 33.00.44383.1 ± 25.590.1 ± 32.20.501
Hamstring peak torque, N∙mInvolved52.9 ± 24.848.6 ± 29.70.56261.8 ± 19.262.7 ± 26.00.915
Uninvolved59.8 ± 23.758.1 ± 31.10.81962.1 ± 19.373.9 ± 29.40.174
Torque deficit in the involved leg compared to uninvolved leg (%)Quadriceps28.3 ± 21.49.9 ± 50.10.1316.8 ± 22.517.1 ± 29.10.269
Hamstring12.5 ± 22.111.6 ± 41.10.917−0.7 ± 17.415.3 ± 13.70.012
Hamstring to quadriceps ratioInvolved1.02 ± 0.510.83 ± 0.270.1220.89 ± 0.490.91 ± 0.210.926
Uninvolved0.82 ± 0.470.80 ± 0.130.8100.76 ± 0.130.84 ± 0.230.189
Work, JInvolved1930.7 ± 1163.61657.7 ± 1088.70.3932724.4 ± 994.32422.5 ± 1189.20.447
Uninvolved2994.6 ± 1113.72443.7 ± 1167.00.0872902.1 ± 1083.03108.5 ± 1174.50.619
  1. Values are presented as mean ± standard deviation derived with Student’s t test
  2. The statistical significance was set at P < 0.05; significant results are shown in bold type
  3. ACLR anterior cruciate ligament reconstruction, PCLR posterior cruciate ligament reconstruction