Table 3 Mean value and standard deviation of peak torque (Nm), work (J) and Power (W) preoperatively as well as after a follow up of 5 days and 4 weeks after surgery with enhanced recovery or conventional setup

Peak torque (Nm)

 60°/s extension

Pre-OP

43.16 Nm (± 25.47 Nm)

47.22 Nm (± 34.71Nm)

p = 0.746

5 days post-OP

16.30Nm (± 8.00 Nm)

16.08 Nm (± 8.87 Nm)

p = 0.623

4 weeks post-OP

31.43 Nm (± 13.31 Nm)

33.56 Nm (± 15.43 Nm)

p = 0.636

 180°/s extension

Pre-OP

22.99 Nm (± 15.60 Nm)

23.70 Nm (± 26.65 Nm)

p = 0.493

5 days post-OP

10.57 Nm (± 10.19 Nm)

7.38 Nm (± 10.55 Nm)

p = 0.277

4 weeks post-OP

24.95 Nm (± 9.99)

28.15 Nm (± 12.09 Nm)

p = 0.414

 60°/s flexion

Pre-OP

25.93 Nm (± 18.62 Nm)

26.86 Nm (± 18.29 Nm)

p = 0.803

5 days post-OP

10.61Nm (± 9.78 Nm)

5.01 Nm (± 5.47 Nm)

p = 0.074

4 weeks post-OP

22.06 Nm (± 10.34)

21.24 Nm (± 12.29 Nm)

p = 0.484

 180°/s flexion

Pre-OP

11.55 Nm (± 10.74 Nm)

12.67 Nm (± 15.06 Nm)

p = 1.000

5 days post-OP

4.81 Nm (± 6.31 Nm)

1.51 Nm (± 2.51 Nm)

p = 0.047

4 weeks post-OP

10.51 Nm (± 7.92)

12.55 Nm (± 11.35 Nm)

p = 0.420

Overall Work (J)

 60°/s extension

Pre-OP

207.59 J (± 128.67 J)

215.70 J (± 146.72 J)

p = 0.882

5 days post-OP

49.07 J (± 36.89 J)

40.15 J (± 45.06 J)

p = 0.208

4 weeks post-OP

125.20 J (± 71.24 J)

141.82 J (± 72.42 J)

p = 0.355

 180°/s extension

Pre-OP

187.76 J (± 177.95 J)

199.55 J (± 256.16 J)

p = 0.690

5 days post-OP

49.49 J (± 64.78 J)

32.84 J (± 59.06 J)

p = 0.110

4 weeks post-OP

183.17 J (± 120.48)

220.51 J (± 121.90 J)

p = 0.282

 60°/s flexion

Pre-OP

112.92 J (± 86.61 J)

118.84 J (± 85.49 J)

p = 0.817

5 days post-OP

25.86 J (± 31.26 J)

9.59 J (± 14.26 J)

p = 0.072

4 weeks post-OP

69.53 J (± 50.16)

71.94 J (± 51.54 J)

p = 0.974

 180°/s flexion

Pre-OP

64.27 J (± 89.81 J)

97.66 J (± 175.67 J)

p = 0.637

5 days post-OP

12.71 J (± 24.76 J)

1.21 J (± 2.88 J)

p = 0.040

4 weeks post-OP

48.05 J (± 67.07 J)

52.48 J (± 69.30 J)

p = 0.471

Power (Watt)

 60°/s extension

Pre-OP

24.33 W (± 16.12 W)

25.46 W (± 20.64 W)

p = 0.897

5 days post-OP

7.95 W (± 5.14 W)

6.52 W (± 6.38 W)

p = 0.212

4 weeks post-OP

18.41 W (± 9.72 W)

21.19 W (± 11.25 W)

p = 0.426

 180°/s extension

Pre-OP

24.45 W (± 23.63 W)

26.86 W (± 38.10 W)

p = 0.802

5 days post-OP

5.73 W (± 7.75 W)

4.61 W (± 8.37 W)

p = 0.230

4 weeks post-OP

24.86 W (± 15.75)

32.38 Nm (± 19.71 W)

p = 0.208

 60°/s flexion

Pre-OP

12.82 W (± 10.39 W)

13.97 W (± 13.09 Nm)

p = 0.846

5 days post-OP

3.89 W (± 4.45 W)

1.54 W (± 2.24 W)

p = 0.060

4 weeks post-OP

9.64 W (± 5.65)

10.07 W (± 7.02 W)

p = 1.000

 180°/s flexion

Pre-OP

7.80 W (± 10.70 W)

12.66 W (± 25.59 W)

p = 0.656

5 days post-OP

1.67 W (± 3.14 W)

0.19 W (± 0.47 W)

p = 0.016

4 weeks post-OP

6.04 W (± 7.87)

7.68 W (± 10.77 W)

p = 0.568