• J Manipulative Physiol Ther · Feb 2002

    Incidence of foot rotation, pelvic crest unleveling, and supine leg length alignment asymmetry and their relationship to self-reported back pain.

    • Gary A Knutson.
    • gaknutson@aol.com
    • J Manipulative Physiol Ther. 2002 Feb 1; 25 (2): 110E.

    ObjectiveTo determine the incidence of pelvic unleveling, foot rotation, and supine leg length alignment asymmetry in a nonclinical population and to examine the validity (sensitivity, specificity, positive and negative predictive values) of these visual tests and their relationship to self-reported back pain.DesignVolunteers answered a questionnaire regarding back pain and were then examined by a chiropractor who was unaware of the status of their back pain.ParticipantsSeventy-four unscreened volunteers answered the questionnaire.Main Outcome MeasuresThe association of visual tests with back pain and their validity indices; Visual Analogue Scale ratings.ResultsFifty-one percent (n = 74) of volunteers examined had supine leg length alignment asymmetry (LLA). Pain intensity on a Visual Analogue Scale was significantly higher (P <.001) for those demonstrating supine LLA than for those without LLA. Those with back pain and recurrent back pain were significantly (P <.001) more likely to have supine LLA. The validity indices of the supine leg check showed acceptable levels for sensitivity (74%), specificity (78%), and positive predictive value (82%) [corrected] in recurrent back pain. Findings also indicated a high incidence of supine LLA in volunteers with chronic back pain (85%).ConclusionThe results indicated that, in this group of volunteers, the supine leg length alignment check had clinical validity as a stand-alone test for recurring back pain. Further testing on a larger, statistically defined cross-section of the population is recommended.

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