However, it has several limitations with respect to allowing clinicians to analyse the ROM at the gate, and tracking the hip joint during walking or in maximum squat. The goniometer is the most common method employed to measure joint angles. Early detection of FAI helps people avoid the development of osteoarthritis. The range of motion (ROM) of the hip joint is an important clinical parameter used in diagnosing femoroacetabular impingement (FAI).

The Kinect! has basic motion capture capabilities and with some minor adjustments will be an acceptable tool to measure stride timing, but sophisticated advances in software and hardware are necessary to improve Kinect! sensitivity before it can be implemented for clinical use. Variability in Kinect! measurements was smallest at the slowest velocity. Correlation between Kinect! and Vicon stride timing was high and error was fairly small. Kinect! knee measurements were somewhat better than hip, but were not consistent enough for clinical assessment. Kinect! and Vicon hip angular displacement correlation was very low and error was large. Although Kinect measurements were representative of normal gait, the Kinect! generally under-estimated joint flexion and over-estimated extension. Concurrent hip and knee peak flexion and extension and stride timing measurements were compared between Vicon and Kinect!. Twenty healthy adults (nine male, 11 female) were tracked while walking and jogging at three velocities on a treadmill. The purpose of this study was to assess concurrent validity of the Kinect! with Brekel Kinect software in comparison to Vicon Nexus during sagittal plane gait kinematics.

The Microsoft Kinect! has the potential to be used as an alternative low-cost motion analysis tool. Three-dimensional (3D) motion capture systems are widely used, accurate systems, but are costly and not available in many clinical settings. Biomechanical analysis is a powerful tool in the evaluation of movement dysfunction in orthopaedic and neurologic populations.

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