Many practitioners have
associated a difference in the length of the legs with low back pain. When a patient
has a short leg, it's called a leg length discrepancy (LLD). The idea is that
shorter leg indicates an asymetrical pelvis or SI joint, or causes unequal forces to be
distributed to the low back and thus leads to pain. There are some well done
medical studies on this question. None have found an association between a short leg
and low back pain. Here are some of the better articles::
