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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology


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ORIGINAL ARTICLE  SPORT INJURIES AND REHABILITATION


The Journal of Sports Medicine and Physical Fitness 2017 July-August;57(7-8):1003-13

DOI: 10.23736/S0022-4707.17.06911-0

Copyright © 2017 EDIZIONI MINERVA MEDICA

language: English

Leg stiffness, valgus knee motion, and Q-angle are associated with hypertrophic soft patella tendon and idiopathic knee pain in adolescent basketball players

Danguole SATKUNSKIENE, Mantas MICKEVICIUS, Audrius SNIECKUS, Sigitas KAMANDULIS

Institute of Sport Science and Innovations, Lithuanian Sports University, Kaunas, Lithuania


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BACKGROUND: Knee pain without knee degenerative symptoms is a common phenomenon among young basketball players. The aim of this study was to identify factors predisposing young basketball players to suffer from knee pain.
METHODS: The study involved 20 male adolescent (14-15 years) basketball players who were divided into two equal groups based on knee pain symptoms. Legs torque was tested on an isokinetic dynamometer. The length, elongation and the cross-sectional area (CSA) of the patellar tendon were measured with ultrasonography. Quadriceps angle (Q-angle), knee valgus motion, and joint angular displacement in the sagittal plane were analyzed using video recording during countermovement jump. Ground reaction force was measured using a force platform.
RESULTS: Knee pain (KP) participants had a significantly lower Q-angle (P=0.045) and lower maximum varus knee angle (P=0.035), and a greater knee inside displacement (P=0.039) during squat phase. In the KP group, the CSA at the top of the tendon was significantly greater than in the middle (P=0.006) and at the bottom (P=0.039). Absolute tendon stiffness (P=0.013) and Young’s modulus (P=0.034) were significantly lower in the KP group compared with controls. Leg stiffness during landing was significantly greater in the control group (P=0.015).
CONCLUSIONS: Leg stiffness, valgus knee motion, and Q-angle are associated with hypertrophic soft patella tendon and idiopathic knee pain in adolescent basketball players.


KEY WORDS: Elastic modulus - Patellofemoral pain syndrome - Patellar ligament - Ultrasonography

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Publication History

Issue published online: June 12, 2017
Article first published online: January 13, 2017
Manuscript accepted: January 5, 2017
Manuscript revised: December 5, 2016
Manuscript received: August 8, 2016

Cite this article as

Satkunskiene D, Mickevicius M, Snieckus A, Kamandulis S. Leg stiffness, valgus knee motion, and Q-angle are associated with hypertrophic soft patella tendon and idiopathic knee pain in adolescent basketball players. J Sports Med Phys Fitness 2017;57:1003-13. DOI: 10.23736/S0022-4707.17.06911-0

Corresponding author e-mail

audrius.snieckus@lsu.lt