The immediate effect of sacroiliac manipulation on hip strength in patients suffering from chronic sacroiliac syndrome
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The aim of this investigation was to investigate whether an immediate objective increase in hip strength was observed after an ipsilateral sacroiliac manipulation in patients suffering from chronic sacroiliac syndrome. The actions of hip flexion, extension, abduction and adduction were assessed. The study also investigated the patients’ subjective perception of pain due to the chronic sacroiliac syndrome before and after the manipulation. The proposed increases in strength would have been as a result of a reduction in arthrogenic muscle inhibition. Stimulation of nociceptors caused by the chronic sacroiliac syndrome would have lead to the presence of the arthrogenic muscle inhibition within the joint. Arthrogenic muscle inhibition has been described as an inability of a muscle group to utilise all its muscle fibres when performing a maximum voluntary contraction of that muscle group. Arthrogenic muscle inhibition is a joints natural response to pain, damage or distension within the joint. The response is an ongoing reflex inhibition of the muscles surrounding the joint in order to protect the joint. The inhibition of the surrounding musculature clinically manifests itself as a decrease in strength of the affected muscles. The decreased strength levels hampers rehabilitation of the affected joints as active exercise forms a vital role in the rehabilitation process. Current treatment options used to reduce arthrogenic muscle inhibition include lidocaine injection into the joint, cryotherapy and transcutaneous nerve stimulation. These treatments are aimed rather at the reduction of pain, joint effusions and atrophy of the related musculature than at the reduction of arthrogenic muscle inhibition. Recent studies have proposed that manipulation reduced arthrogenic muscle inhibition by causing excitation of the joint receptors, called the Wyke receptors. Stimulation of these joint receptors is thought to cause an alteration in the afferent input to the motorneuron pool resulting in a reduction of arthrogenic muscle inhibition. This study aimed to investigate whether sacroiliac manipulation could reduce arthrogenic muscle inhibition at the hip by assessing the immediate gains in hip muscle strength. The problem statement was to evaluate if an immediate subjective or objective change in hip strength was observed after an ipsilateral sacroiliac manipulation in patients suffering from chronic sacroiliac syndrome.