Table 4.

Pre- and postoperative gait during level walking and stair negotiation of patients receiving the mini-subvastus approach

Parameter	Preoperative	Two months postoperative	p value
Spatiotemporal
Level walking
Double-limb support (%)	32 ± 6	29 ± 4	0.003
Involved single-limb support (%)	34 ± 4	38 ± 2	0.022
Walking speed (m/second)	0.85 ± 0.15	0.97 ± 0.16	< 0.0001
Cadence (steps/minute)	31.58 ± 5.72	35.68 ± 5.61	< 0.0001
Stride length (m)	0.99 ± 0.14	1.09 ± 0.13	< 0.0001
Kinematics/Kinetics
Level walking
Knee varus angle (°)	8.02 ± 3.52	3.88 ± 4.21	0.005
Knee valgus angle (°)	1.58 ± 3.06	5.66 ± 3.10	< 0.0001
Knee varus moment (Nm/kg)	0.41 ± 0.18	0.32 ± 0.08	0.005
Ankle plantarflexion moment (Nm/kg)	1.08 ± 0.18	1.18 ± 0.14	0.030
Knee power generation (W/kg)	0.25 ± 0.14	0.52 ± 0.18	< 0.0001
Ankle power generation (W/kg)	1.45 ± 0.55	1.69 ± 0.51	0.014
Up stairs
Knee flexion angle (°)	80.45 ± 5.17	89.23 ± 2.72	0.009
Down stairs
Knee extension moment (Nm/kg)	0.20 ± 0.06	0.31 ± 0.02	0.007
Knee power absorption (W/kg)	1.37 ± 0.44	1.55 ± 0.46	0.038

Values are expressed as mean ± SD.