Biomechanical toolkit package

CGA was performed under identical conditions at each time point. A 12-camera motion analysis system was used to capture full-body motion during gait (VICON Peak, Oxford, UK, at T0 and T1; Qualisys Oqus 7+, Qualisys, Sweden, at T2). Markers were placed on the lower limbs and pelvis according to the Conventional Gait Model 16 . Patients were asked to walk barefoot at their own pace along a 12-metre walkway. Data for each patient were collected over at least ten gait cycles. Visual 3D (C-Motion, Inc., Germantown MD, USA), the open-source Biomechanical ToolKit package and Matlab R2012b (MathWorks, USA) software were used to compute kinematic data 17 . Only the operated limb was considered. The gait outcomes calculated from the CGAs and used in the statistical analysis were: self-selected gait velocity (m.s -1 ), dimensionless gait velocity (gait velocity (m.s -1 ) divided by the square root of the product of the leg length (m) and the gravitational constant (m.s -2 ), also called the Froude number), and the range of knee flexion (°) and maximal knee flexion (°) during the complete gait cycle 18 .