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  • Title: The effect of the hypermobility syndrome on knee joint proprioception.
    Author: Hall MG, Ferrell WR, Sturrock RD, Hamblen DL, Baxendale RH.
    Journal: Br J Rheumatol; 1995 Feb; 34(2):121-5. PubMed ID: 7704456.
    Abstract:
    Proprioceptive sensory feedback is utilized by the central nervous system for conscious appreciation of the position and movement of the body and limbs. In patients with the hypermobility syndrome (HMS), it has been suggested that there is alteration of proprioceptive acuity. Proprioceptive performance of the knee joint was investigated in 10 female subjects who suffered from HMS using a threshold detection paradigm (accurate determination of the onset and direction of knee joint displacement at constant angular velocity). Compared to age- and sex-matched controls, HMS subjects showed significantly higher detection levels at starting knee flexion angles of 30 degrees P < 0.001) and 5 degrees (P < 0.001). Control subjects showed no significant difference in threshold acuity between the sexes (at 5 degrees P = 0.63, at 30 degrees P = 0.48). The increased acuity in proprioception observed towards full extension in the control population (P < 0.001) was absent in the HMS subjects (P = 0.596). Findings reported here suggest that HMS subjects have poorer proprioceptive feedback than controls. Reduced sensory feedback may lead to biomechanically unsound limb positions being adopted. Such a mechanism may allow acceleration of degenerative joint conditions, and may account for the increased prevalence of such conditions seen with HMS subjects.
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