Compared to conventional manipulative therapy treatment techniques, mobilizations with movement treatment techniques (MWM) are unique because they consist of the application of a sustained accessory glide to a joint while the patient performs a previously painful movement of that joint (Mulli- gan 1999). The most important feature of MWM is that when indicated the treatment technique produces a total and immediate relief of pain during the treatment application. This improvement is often enhanced and maintained following several repeti- tions (e.g. 2–3 sets of 6–10 repetitions) of therapist delivered treatment and over a course of several weeks by patient-delivered self-mobilization exer- cises. Mulligan (1999) postulated that the success of MWM in conferring this rapid pain relief and restoration of movement was due to its ability to reduce a positional fault of the bony segments. Hence the origination of the positional fault hypothesis of MWM. The positional fault hypothesis has not been studied.