The short-term effect of sacroiliac manipulation on hip muscle strength in patients suffering from chronic sacroiliac syndrome
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Arthrogenic muscle inhibition (AMI) is the reflex inhibition of the muscles that surround an injured joint in consequence to disturbed afferent feedback originating from the receptors of that joint. The resultant altered afferent innervation of the motor neuron pool leads to a decrease in recruitment ability within the motor neuron pool, a decrease in contraction force of the muscles that fall within the motor neuron pool, and hence the clinical manifestation of AMI as a decrease in muscle strength. Spinal manipulation has been proposed to activate mechanoreceptors and proprioceptors within and around the manipulated joint. The altered afferent input arising from their stimulation is thought to cause changes in motor neuron excitability. In this respect, sacroiliac manipulation has been shown to effectively reduce muscle inhibition and increase muscle strength of the quadriceps muscle group in patients with anterior knee pain. The focus of AMI has been aimed primarily at the quadriceps muscle group whereas little information is available on the functional properties of the muscles moving the hip joint. Thus, the purpose of the present cohort study was to determine the short - term effect of sacroiliac manipulation on ipsilateral hip muscle strength and subjective low back pain intensity in thirty male subjects presenting with low back pain, attributable to chronic sacroiliac syndrome. The first objective of the study was to evaluate the short - term effect of sacroiliac manipulation on the strength of the musculature of the ipsilateral hip joint for the actions of flexion, extension, adduction and abduction by means of the Cybex Orthotren II Isokinetic Rehabilitation System, with respect to objective clinical findings.