Altered landing strategy during vertical jump tasks in elite volleyball players with patellar tendinopathy.

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Abstract

[Indexed for MEDLINE] Conflict of interest statement: Declaration of competing interest This research received no financial support. The authors declare no conflicts of interest. 9. J Phys Ther Sci. 2022 Feb;34(2):103-109. doi: 10.1589/jpts.34.103. Epub 2022 Feb 23. Knee dynamics during take-off and landing in spike jumps performed by volleyball players with patellar tendinopathy. Obara K(1), Chiba R(2), Takahashi M(2), Matsuno T(3), Takakusaki K(2). Author information: (1)Department of Orthopedic Surgery, Asahikawa Medical University: 2-1-1-1 Midorigaoka-Higashi, Asahikawa, Hokkaido 078-8510, Japan. (2)Division of Neuroscience, Department of Physiology, Asahikawa Medical University, Japan. (3)Asahikawa Medical University, Japan. [Purpose] Patellar tendinopathy is a common sports injury. The risk factors for this injury can be categorized as intrinsic, extrinsic, and dynamic. We examined the dynamic factors in this study. [Participants and Methods] The participants were volleyball players who were assigned to a patient group (n=6) if they had medial patellar tendinopathy in the left knee or to a control group (n=7) otherwise. The participants performed spike jumps, and their ground reaction force and three-dimensional kinematic data were recorded. Knee angle and moment data were extracted at the peak extension moment of take-off and landing. [Results] The two groups showed no differences in knee angles. A tendency for abduction/external rotation moments at take-off and landing on both sides was observed in the control group, while the patient group showed adduction and internal rotation moments at take-off and adduction moment at landing in the left (injured) knee. [Conclusion] The observed knee joint moments in the left (injured) knee of the patient group may have been involved in the pathophysiological mechanism underlying the development of patellar tendinopathy. 2022©by the Society of Physical Therapy Science. Published by IPEC Inc. DOI: 10.1589/jpts.34.103 PMCID: PMC8860694