Table 2.
Results of functional tests
| Measured resection | Gap balancer | |||
|---|---|---|---|---|
| Functional test | Mean (95% CI) | Mean (95% CI) | Mean difference (95% CI) | p-value |
| Peak quadriceps torque (N) | ||||
| Pre-op | 40.79 (33.44–48.13) | 50.24 (42.81–57.66) | – 9.45 (– 19.90 to 0.99) | 0.075 |
| 6 weeks | 40.41 (35.34–45.47) | 41.90 (36.95–46.85) | – 1.50 (– 8.58 to 5.58) | 0.675 |
| 3 months | 51.42 (44.43–58.40) | 57.46 (50.48–64.44) | – 6.04 (– 15.92 to 3.83) | 0.227 |
| 6 months | 60.92 (53.45–68.39) | 63.67 (56.38–70.96) | – 2.75 (– 13.19 to 7.69) | 0.601 |
| 1 year | 69.13 (59.79–78.46) | 72.48 (63.37–81.59) | – 3.35 (– 16.39 to 9.69) | 0.610 |
| Peak hamstring torque (N) | ||||
| Pre-op | 26.35 (22.09–30.61) | 37.54 (33.23 – 41.85) | – 11.19 (– 17.24 to – 5.13) | < .0001 |
| 6 weeks | 28.13 (24.84–31.42) | 29.34 (26.09–32.59) | – 1.21 (– 5.83 to 3.41) | 0.605 |
| 3 months | 34.03 (30.56–37.50) | 36.30 (32.83–39.77) | – 2.27 (– 7.18 to 2.64) | 0.361 |
| 6 months | 39.12 (34.56–43.68) | 39.41 (34.91–43.92) | – 0.29 (– 6.71 to 6.12) | 0.927 |
| 1 year | 43.59 (39.17–48.01) | 44.08 (39.77–48.39) | – 0.49 (– 6.66 to 5.68) | 0.875 |
| Wii Fit Balance | ||||
| Pre-op | 68.89 (63.71–74.08) | 67.45 (62.26–72.63) | 1.45 (– 5.89 to 8.78) | 0.696 |
| 6 weeks | 65.07 (59.24–70.89) | 71.27 (65.51–77.02) | – 6.20 (– 14.39 to 1.99) | 0.136 |
| 3 months | 71.95 (67.38–76.53) | 74.20 (69.68–78.72) | – 2.25 (– 8.68 to 4.18) | 0.488 |
| 6 months | 77.41 (74.32–80.50) | 76.02 (73.08–78.96) | 1.39 (– 2.88 to 5.65) | 0.519 |
| 1 year | 75.13 (71.07–79.18) | 74.76 (70.81–78.72) | 0.36 (– 5.30 to 6.03) | 0.899 |
| Timed up and go (s) | ||||
| Pre-op | 14.09 (12.03–16.14) | 12.55 (10.49–14.61) | 1.54 (– 1.37 to 4.45) | 0.297 |
| 6 weeks | 12.09 (10.22–13.96) | 12.50 (10.63–14.37) | – 0.41 (– 3.06 to 2.24) | 0.759 |
| 3 months | 10.45 (9.10–11.81) | 10.47 (9.13–11.81) | – 0.02 (– 1.92 to 1.89) | 0.984 |
| 6 months | 10.50 (8.43–12.56) | 9.94 (7.95–11.93) | 0.55 (– 2.31 to 3.42) | 0.702 |
| 1 year | 10.62 (8.99–12.26) | 9.16 (7.56–10.75) | 1.46 (– 0.82 to 3.75) | 0.205 |
| 6-min walk test (m) | ||||
| Pre-op | 238.74 (202.6–274.8) | 263.45 (227.3–299.5) | – 24.70 (– 75.73 to 26.32) | 0.339 |
| 6 weeks | 266.24 (228.8–303.6) | 298.80 (261.3–336.2) | – 32.56 (– 85.46 to 20.35) | 0.225 |
| 3 months | 334.82 (291.9– 377.6) | 360.02 (317.6–402.4) | – 25.20 (– 85.48 to 35.07) | 0.408 |
| 6 months | 367.33 (325.2– 409.4) | 378.19 (337.5–418.8) | – 10.85 (– 69.39 to 47.69) | 0.713 |
| 1 year | 358.48 (316.4– 400.4) | 389.40 (348.4– 430.4) | – 30.93 (– 89.63 to 27.77) | 0.298 |
| Timed stairs (s) | ||||
| Pre-op | 32.01 (21.12–42.91) | 23.12 (12.22–34.01) | 8.90 (– 6.51 to 24.30) | 0.254 |
| 6 weeks | 24.45 (20.30–28.60) | 24.50 (20.36–28.65) | – 0.05 (– 5.92 to 5.81) | 0.986 |
| 3 months | 17.71 (13.84–21.58) | 19.37 (15.55–23.20) | – 1.66 (– 7.10 to 3.78) | 0.545 |
| 6 months | 16.90 (13.77–20.03) | 16.58 (13.57–19.60) | 0.32 (– 4.03 to 4.66) | 0.885 |
| 1 year | 16.46 (13.75–19.17) | 14.10 (11.46–16.75) | 2.35 (– 1.44 to 6.14) | 0.220 |
The scores were analysed by means of Analysis of Variance (ANOVA)