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Touch pressure and sensory density after tarsal tunnel release in diabetic neuropathy
William H Gondring1, Prashant K Tarun, Elly Trepman
1St. Joseph Orthopedics and Heartland Regional Medical Center, St. Joseph, MO 64506, USA. gondring@stjoelive.com
Background:
Limited quantitative information is available about the improvement of protective sensation after tarsal tunnel release in patients with diabetic peripheral neuropathy.
Methods:
Prospective, non-blinded, non-randomized case series of 10 feet in 8 diabetic patients and 24 feet in 22 non-diabetic patients who had tarsal tunnel release. Preoperative and postoperative (average, 8-9 months) anatomic, quantitative sensory testing was done with touch pressure 1-point threshold (Semmes-Weinstein monofilaments) and 2-point discrimination.
Results:
There was marked, significant postoperative improvement of mean touch pressure 1-point threshold, compared with preoperative values, for medial calcaneal, medial plantar, and lateral plantar nerves in both non-diabetic and diabetic patients. There was minimal improvement in 2-point discrimination only for the medial calcaneal nerve in non-diabetic, but not in diabetic, patients.
Conclusions:
Nerve entrapment at the tarsal tunnel is an important component of diabetic peripheral neuropathy. Tarsal tunnel decompression may improve sensory impairment and restore protective sensation.
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