H. JOE PRYOR, M.D.
To the editor: In regard to the review, "Rheumatoid Arthritis, 1970-1972," by Johnson, and associates (Ann Intern Med 78:937-953, 1973) under the subheading "entrapment syndromes," two errors should be noted. First, the prosterior interosseous is a branch of the radial, not the ulnar, nerve. Second, the medial calcaneal is a branch of the posterior tibial (not the sural), which is the nerve occasionally entrapped in the tarsal tunnel. The only calcaneal branch of the sural nerve is the lateral calcaneal, which provides sensation to the lateral side of the heel. It does not penetrate the flexor retinaculum and therefore is
PRYOR HJ. Correction: Posterior Interosseous Nerve. Ann Intern Med. ;79:765–766. doi: 10.7326/0003-4819-79-5-765_3
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Published: Ann Intern Med. 1973;79(5):765-766.
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