Lower-limb adaptation during squatting after isolated posterior cruciate ligament injuries.
Summary of "Lower-limb adaptation during squatting after isolated posterior cruciate ligament injuries."
BACKGROUND:
While many studies point out that posterior cruciate ligament plays an important role in squatting, not many, if any, have looked into knee kinematics or kinetics for isolated posterior cruciate ligament injuries. This study explores lower-limb adaptation during squatting for asymptomatic patients with isolated chronic posterior cruciate ligament injuries.
METHODS:
Thirteen research subjects or test participants with isolated chronic posterior cruciate ligament injuries were recruited to analyze the kinematics and kinetics on both sides of their hip, knees and ankle joints during squatting. We adopted ExpertVision motion analysis system and two Kistler force plates to record the three-dimensional trajectories of the reflective markers used and the ground reaction forces respectively.
FINDINGS:
The peak vertical ground reaction force exerted on the participants, their peak support moment and the knee-joint peak extension moment exhibited at their non-involved side are significantly greater than that at their involved side. We also find that the involved side's knee joint (extension moment) exhibits a reduced percentage on the peak support moment contributed by the individual joints, while the joints of the hip and ankle signify increased percentages.
INTERPRETATION:
In this study, the asymptomatic participants having isolated chronic posterior cruciate ligament injuries tend to shift their weight to their non-involved side, and part of their injured knee-joint load to their ipsilateral joints of the hip and ankle. The causes seem to be a habitual gravity center shift, insufficient muscle strength at the involved side, and a reduced mechanical efficiency in their extensor mechanism.
Affiliation
Institute of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan; Department of Physical Therapy, Kaohsiung Medical University, and Department of Rehabilitation Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
Journal Details
This article was published in the following journal.
Name: Clinical biomechanics (Bristol, Avon)
ISSN: 1879-1271
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20655133
- DOI: http://dx.doi.org/10.1016/j.clinbiomech.2010.06.014
Medical and Biotech [MESH] Definitions
Internal Capsule
White matter pathway, flanked by nuclear masses, consisting of both afferent and efferent fibers projecting between the cerebral cortex and the brainstem. It consists of three distinct parts: an anterior limb, posterior limb, and genu.
Lower Extremity
The region of the lower limb in animals, extending from the gluteal region to the FOOT, and including the BUTTOCKS; HIP; and LEG.
Limb Buds
Distinct regions of mesenchymal outgrowth at both flanks of an embryo during the SOMITE period. Limb buds, covered by ECTODERM, give rise to forelimb, hindlimb, and eventual functional limb structures. Limb bud cultures are used to study CELL DIFFERENTIATION; ORGANOGENESIS; and MORPHOGENESIS.
Adaptation, Ocular
The adjustment of the eye to variations in the intensity of light. Light adaptation is the adjustment of the eye when the light threshold is increased; DARK ADAPTATION when the light is greatly reduced. (From Cline et al., Dictionary of Visual Science, 4th ed)
Ankle
The region of the lower limb between the FOOT and the LEG.
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