Femoral Nerve Transfer for Treatment of Brachial Plexus Root Avulsion

Abstract

Femoral nerve transfer to the muscular branches of the thenar and hypothenar muscles was performed to determine its protective effect on the hand intrinsic muscles. Seven cases of brachial plexus root avulsion treated from May of 1989 to October of 1991 were involved. The femoral nerve transfer to the muscular branches of the thenar and hypothenar muscles was done at the same stage of multiple neurotization. The muscular branches derived from the femoral nerve were isolated and coapted with the thenar muscle branch of the median nerve and the deep branch of the ulnar nerve. A groin flap was harvested simultaneously to form a skin-tube pedicle that covered the nerve bridge. At the second stage, when regeneration of the median and ulnar nerves was found to reach as far as the level of the wrist, the femoral nerve was divided and the muscular branches of the thenar and hypothenar muscles were anastomosed with the regenerated median and ulnar nerves. All the cases were followed up for more than 6 years. Six months after femoral nerve transfer, muscle power of the interosseous muscles and adductor pollicis recovered to MRC3, whereas that of the abductor pollicis brevis recovered to MRC1 to 2. Five cases underwent second-stage transfer. Four to five years of follow-up revealed that the muscle power of the interosseous muscles and adductor pollicis was MRC2 in one case, MRC1 in three cases, and MRC0 in one case. As for the donor area, muscle power of the quadriceps femoris reduced to M3 to 4 within 1 month after femoral nerve transfer and recovered to normal at 3 months. In conclusion, femoral nerve transfer to the muscular branches of the thenar and hypothenar muscles has some protective effect on the hand intrinsic muscles. The outcome of the second stage, however, is not satisfactory.

Concepts of nerve regeneration and repair applied to brachial plexus reconstruction

“…Several months later, femoral-nerve baby-sitting is interrupted, and thenar and hypothenar branches are coapted to their parent nerves. According to Gu et al, 14 there are no benefits to this procedure. 2.…”

Restoration of Shoulder Abduction in Brachial Plexus Injury with Phrenic Nerve Transfer

“…In root avulsion injuries of the brachial plexus, nerve transfer is probably the first option when restoring the basic limb function. Many donor nerves have been used including the intercostal nerve, 1,2 the spinal accessory nerve, 3–7 the contralateral C7 nerve root, 8,9 the femoral nerve, 10 part of the ulnar nerve 11,12 and the phrenic nerve. 13,14 According to Gu and Ma, phrenic nerve transfer was found to be superior to double intercostal nerve transfer, accessory nerve transfer, and single intercostal nerve transfer on the basis of superior neural regeneration in a rat model.…”