The authors present the cases of 3 patients with severe injuries affecting the peroneal nerve combined with loss of tibialis posterior function (inversion) despite preservation of other tibial nerve function. Loss of tibialis posterior function is problematic, since transfer of the tibialis posterior tendon is arguably the best reconstructive option for foot drop, when available. Analysis of preoperative imaging studies correlated with operative findings and showed that the injuries, while predominantly to the common peroneal nerve, also affected the lateral portion of the tibial nerve/division near the sciatic nerve bifurcation. Sunderland’s fascicular topographic maps demonstrate the localization of the fascicular bundle subserving the tibialis posterior to the area that corresponds to the injury. This has clinical significance in predicting injury patterns and potentially for treatment of these injuries. The lateral fibers of the tibial division/nerve may be vulnerable with long stretch injuries. Due to the importance of tibialis posterior function, it may be important to perform internal neurolysis of the tibial division/nerve in order to facilitate nerve action potential testing of these fascicles, ultimately performing split nerve graft repair when nerve action potentials are absent in this important portion of the tibial nerve.
ABBREVIATIONSFDL = flexor digitorum longus; FHL = flexor hallucis longus; MRC = Medical Research Council; NAP = nerve action potential.
Correspondence Robert J. Spinner: Mayo Clinic, Rochester, MN. firstname.lastname@example.org.INCLUDE WHEN CITING Published online December 21, 2018; DOI: 10.3171/2018.8.JNS181190.Disclosures The authors report no conflict of interest concerning the materials or methods used in this study or the findings specified in this paper.
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OberlinC, BéalD, LeechavengvongsS, SalonA, DaugeMC, SarcyJJ: Nerve transfer to biceps muscle using a part of ulnar nerve for C5-C6 avulsion of the brachial plexus: anatomical study and report of four cases. 19:232–237, 1994)| false