Table 2.

Presentation, Physical Examination, Ultrasound,⁴¹ and Electrodiagnostic Parameters³⁶ for the Diagnosis of CuTS

Spectrum of Disease	Mild (Dynamic ischemia)	Moderate (Demyelination)	Severe (Axonal loss)
Presentation	Intermittent paresthesias in ulnar nerve distribution with elbow flexion	Sensory symptoms more constant, some motor weakness	Hand weakness, clawing
Physical examination	Positive findings on provocative testing (elbow flexion test, Tinel sign, scratch collapse test)	Decreased 2-point discrimination, weakness on strength testing (grip and apposition pinch)	Atrophy of intrinsic hand muscles with profound sensory disturbances
US CSA of ulnar nerve	11.1 ± 3.4 mm2	15.8 ± 3.8 mm2	18.3 ± 5.1 mm2
Electromyography	Normal	Normal	Abnormal
Conduction velocity	Normal	Slowed	Slowed