Abstract: ［Abstract］ Objective〖HTSS〗〓To explore the application in the classification of cubital tunnel syndrome by studying the surgical effect of patients with cubital tunnel syndrome(CuTS) when its motor nerve conduction velocity(MNCV) is different.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Sixty patients with cubital tunnel syndrome who underwent ulnar nerve relaxation and subcutaneous anterior transposition were divided into three groups according to MNCV. A group： MNCV is ＞40 m/s. B group： MNCV is 30-40 m/s. C group: MNCV is ＜30 m/s.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The excellent and good results of postoperative comprehensive effect in the three groups were: 90.0%(18/20), 85.0%(17/20), and 45.0%(9/20). The comprehensive effects of group A and group B were better than those of group C, and the difference was statistically significant(P＜005). The recovery of interosseous muscle atrophy, grip strength and clawshaped hand in group A and group B were better than those in group C, and the difference was statistically significant(P＜005).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓The motor nerve conduction velocity can be classified as cubital tunnel syndrome alone ,and it is worth being popularized in clinics. When MNCV is ＞40 m/s， it is mild and we can choose conservative treatment, but the MNCV should be regularly reviewed, if the MNCV is continue to slow down, surgical treatment should be taken. When the MNCV is 30-40 m/s，it is moderate and we should choose surgery treatment and the effect of surgery is good. When MNCV is ＜30 m/s, we should choose surgical treatment as early as possible but the postoperative effect is poor.

Key words: cubital tunnel syndrome, metor nerve conduction velocity, classification