MSK-26 · Nerve Injury Classification and EDX Correlation

Nerve Injury Classification and EDX Correlation. Part of the Musculoskeletal series of the Reflex PM&R Board Review podcast. Audio corrections: (1) In the audio: the timeline is always 12 to 18 months. — Correct: The motor endplate viability window is a rule of thumb of roughly 12 to 24 months, most sources favouring 18 to 24, not a fixed 12 to 18. It is not a hard biological deadline either: human biopsy work has found structurally intact motor endplates surviving more than 3 years after injury. (2) In the audio: Those distal muscles won't fibrillate until three to six weeks after the injury. — Correct: Distal hand and foot muscles develop fibrillation potentials by about three to four weeks (roughly 21 to 30 days for the longest stumps). The six-week upper bound overstates the delay. (3) In the audio: It's often nicknamed honeymoon palsy or strawberry picker's palsy. — Correct: Honeymoon palsy is a radial nerve eponym at the spiral groove, the bedfellow of Saturday night palsy, not a peroneal one. Peroneal compression at the fibular head from leg crossing is crossed-leg palsy; strawberry picker's palsy is a correct name for it. The written chapter is correct. Full correction register: https://www.reflexpmr.com/errata. The full companion chapter and a linked board-style Q-bank set for this topic are at https://www.reflexpmr.com/read/MSK-26.