Which surgical procedure is described for tarsal tunnel syndrome caused by a low-lying tibialis posterior muscle belly?

Which surgical procedure is described for tarsal tunnel syndrome caused by a low-lying tibialis posterior muscle belly?

• A. Tarsal tunnel release with debridement of excess muscle
• B. Nerve graft
• C. Ankle fusion
• D. Ganglion cyst removal

Answer: (A)

Compression of the tibial nerve within the tarsal tunnel can be caused by space-occupying structures, such as an abnormally positioned tibialis posterior muscle belly that crowds the nerve. The most effective treatment here is to relieve that compression by performing a tarsal tunnel release and removing the excess muscle tissue. Releasing the flexor retinaculum opens up the tunnel, and debridement of the low-lying muscle belly directly reduces the bulk that was squeezing the nerve, addressing the underlying cause and allowing the nerve to recover. Other options don’t fit this situation because they address different problems: a nerve graft would be for nerve discontinuity or irreparable nerve injury rather than compression; an ankle fusion treats joint arthritis or instability and won’t relieve neuropathic compression; removing a ganglion cyst targets a cystic lesion, not a muscular crowding issue inside the tunnel.

Compression of the tibial nerve within the tarsal tunnel can be caused by space-occupying structures, such as an abnormally positioned tibialis posterior muscle belly that crowds the nerve. The most effective treatment here is to relieve that compression by performing a tarsal tunnel release and removing the excess muscle tissue. Releasing the flexor retinaculum opens up the tunnel, and debridement of the low-lying muscle belly directly reduces the bulk that was squeezing the nerve, addressing the underlying cause and allowing the nerve to recover.

Other options don’t fit this situation because they address different problems: a nerve graft would be for nerve discontinuity or irreparable nerve injury rather than compression; an ankle fusion treats joint arthritis or instability and won’t relieve neuropathic compression; removing a ganglion cyst targets a cystic lesion, not a muscular crowding issue inside the tunnel.