Abstract:[Abstract] Objective To study and compare the clinical effect of Neer type Ⅱfractures of the lateral end of clavicle treated with clavicular hook plate and Ao locking plate fixation. Methods From January 2008 to January 2009, the 45 patients treated Neer Ⅱ type fracture, in which 25 patients with clavicular hook plate, 20 patients were treated with AO locking clavicle plate by Constant-Murley shoulder function Evaluation and compare the clinical efficacy.Results 2 groups were I wound after healing, patients were followed up for 1 to 2 years, with an average of 1.3 years. Clavicular hook plate group of 23 patients with fracture healing time was 13w (10 ~ 16w). Among them, 2 cases of delayed union, adhere to the shoulder healed after 1 month of exercise, 3 patients had shoulder discomfort, pain during activity, 1 patient had impingement, internal fixation after removing the symptoms gradually disappear. 2 cases because of poor position the tip of the hook slide hook there. AO locking clavicle plate group: 20 patients with fracture healing time 12w (11 ~ 15w), no delayed healing. AO clavicle was found loose or broken lateral locking plate. 2 cases of postoperative shoulder discomfort, pain during activity, the symptoms disappeared after removal of internal fixation. 1 year after surgery were evaluated according to Constant score, the quantitative scores were not significantly different (p> 0.05). One group of clavicular hook plate group were excellent in 15 cases, good in 6 cases, fair in 2 and poor in 2 cases, good in 84%; clavicle lateral locking plate group were excellent in 13 cases, good in 5 cases, fair in 2 cases, good in 90 %.Conclusions Coracoclavical screw and clavicular hook plate fixation for Neer type Ⅱfractures of the lateral end of clavicle both result in good shoulder function. However, a low incidence of postoperative and disease, is conducive to the early functional exercises