“Smoothness” as a Measure of Diagnostics and Effectiveness of Musculoskeletal System Rehabilitation of Athletes

The movement of a healthy person is characterized by smooth trajectories, while the damaged link of the musculoskeletal system produces intermittent movements and it is not able to produce completed movement on the range of acts, available to it. Studies of the “smoothness” parameter as a diagnostic measure and a criterion for the effectiveness of the musculoskeletal system rehabilitation in sports medicine have not been carried out yet. The research studied the average smoothness of the trajectories of markers, fixed on the lower limb during performing the Grand-plie test choreographic movement. Correlation between the level of pain syndrome and the normalized measure of smoothness for the hip joint is 0.85; for the ankle it is 0.74. Correlation between the dynamics of recovery and the normalized measure of smoothness for the hip joint = 0.96; for the ankle = 0.62. Thus, smoothness is considered to be a diagnostic indicator reflecting the adequacy of the rehabilitation load and the entire rehabilitation process.