Improvement in the Contraction of the Transversus Abdominis Following Lumbo-Pelvic Manipulation – A Case Study

Abstract

As a clinician, everyone undergoes a difficult time in clinical decision-making when attempting to apply a clinical prediction rule for manipulation (Flynn et al., 2002; Childs et al., 2004) to a patient with a history and physical examination consistent with clinical lumbar instability (Hicks et al., 2005). The effect on neural pathways associated with manipulation has been suggested as one possible mechanism that may improve muscle performance (Pickar, 2002) and patient symptoms. Support exists for an association between spinal manipulation and improved muscle function in the quadriceps (Suter et al., 1999), the erector spinae (Keller and Colloca, 2000), and the deep neck flexors (Sterling et al., 2001). Therefore, it is reasonable to hypothesize that spinal manipulation, by a reflexogenic mechanism, may improve the performance of the deep trunk stabilizers. In turn, improved relaxation and contractility of the lumbar multifidus and the transversus abdominis (TrA) theoretically could lead to improved functional stability of the spine through enhancement of the neurological and active subsystems as defined by Panjabi (1992a, b). This single case study describes changes observed in the TrA musculature pre- to post-manipulation in a patient that presented with a clinical paradox (symptoms suggestive of clinical lumbar instability but also meeting the clinical prediction rule to succeed with lumbar manipulation therapy). Real-time ultrasound imaging (USI) was used to describe the changes in the TrA musculature..