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- Title
Differences in Isokinetic Strength of the Knee Extensors and Flexors in Men With Isolated and Combined Cruciate-Ligament Knee Injury.
- Authors
Kaminska, Ewa; Piontek, Tomasz; Wiernicka, Marzena; Cywinska-Wasilewska, Grazyna; Lewandowski, Jacek; Lochynski, Dawid
- Abstract
Context: The extent of knee extensor and flexor weakness after disruption of knee ligaments affects a rehabilitation output and functional recovery and may give prognostic information on a possible risk of development of knee osteoarthritis. Objective: The hypothesis tested was whether patients with a multiple-ligament tear would have larger abnormalities in strength of the knee extensors and flexors than patients with an isolated-ligament rupture. Design: Cross-sectional study, level III. Setting: Outpatient orthopedic clinic. Participants: 3 groups of recreationally active men: noninjured control (CON, n = 12), with an anterior cruciate ligament injury (ACLI, n = 10), and with combined anterior and posterior cruciate ligament injury (APCLI, n = 9), matched according to age, body mass, and height. Intervention'. All patients received conservative treatment and rehabilitation and awaited ligament reconstruction surgery. Main Outcome Measures: Isokinetic maximum-repetition peak torque per body mass (PT/BM) and total work (TW), PT and TW limb-symmetry index (LSI), and flexorto- extensor PT ratio were evaluated during concentric knee extension-flexion movements at lower (607s) and higher (2407s) isokinetic velocities. Results: The main finding was that compared with the individuals with ACLI, patients with APCLI produced in their injured limbs lower mean TW (extension: 30.3%, flexion: 28.2%) and had lower mean TW LSI (extension 74% in APCLI vs 91.6% in ACLI; flexion 61.3% in APCLI vs 90.8% in ACLI) at the higher but not lower speed of isokinetic testing. However, at the lower velocity the quantified size of reduction in PT/BM and TW was greater in subjects with APCLI than ACLI as compared with the CON individuals. Conclusions: After bi-cruciate-ligament injury the capacity to produce torque by concentric muscle contractions throughout knee-extension and -flexion movements performed with high speed is lower in injured limbs than after isolated anterior cruciate ligament tear.
- Subjects
POLAND; KNEE physiology; TORQUE; ANALYSIS of variance; ANTERIOR cruciate ligament injuries; ANTHROPOMETRY; CONFIDENCE intervals; EXERCISE physiology; EXERCISE tests; ISOKINETIC exercise; RANGE of motion of joints; KNEE injuries; LIGAMENT injuries; MUSCLE contraction; MUSCLE strength; MUSCLE strength testing; PROBABILITY theory; RESEARCH funding; SPORTS sciences; STATISTICS; COMORBIDITY; DATA analysis; EFFECT sizes (Statistics); CROSS-sectional method; SEVERITY of illness index; EXERCISE intensity; DATA analysis software; POSTERIOR cruciate ligament injuries
- Publication
Journal of Sport Rehabilitation, 2015, Vol 24, Issue 3, p268
- ISSN
1056-6716
- Publication type
Article
- DOI
10.1123/jsr.2014-0157