What does USR stand for?

The right ulnar motor and sensory short segmental studies at the wrist revealed an abnormally prolonged latency difference between the pisiform bone and 2 cm proximal to the pisiform bone (0. 7 and 0. 8 ms respectively; upper normal limit in ulnar motor and sensory nerves, 0. 5 ms) in addition to a conduction block (54. 1%) of the ulnar sensory response over the same segment (Fig. 1-A, B). 4 Needle electromyographic findings from the right ulnar innervated muscles revealed no spontaneous activity, although the normal motor unit potentials had reduced recruitment patterns in the ADM and FDI muscles.