Patient demographics, clinical data, quantitative and qualitative imaging findings.

Patient data, including age (in years), sex, time since HRS (in months), clinically and electrophysiologically affected nerve, muscle strength of affected muscles according to the MRC scale, ratio of T2- signal intensity of the peroneal and tibial nerve related to normal appearing musculature (SR), denervation pattern of target muscles at thigh and calf level, and conclusive imaging diagnosis. F: female, M; male, n.a.: not available, SR: nerve-to-muscle T2- signal intensity ratio. Abbreviations: atm: anterior tibialis muscle; bfm: biceps femoris muscle; edbm:extensor digitorum brevis muscle; edlm: extensor digitorum longus muscle; gm: gastrocnemius muscle; p: peroneal portion of the sciatic nerve or peroneal nerve; pbm: peroneus brevis muscle; plm: peroneus longus muscle; pom: popliteus muscle; sem: semimembranosus muscle; sn: sciatic nerve; t: tibial portion of the sciatic nerve or tibial nerve; ptm: posterior tibialis muscle.