| Objective: To study the biomechanical characteristics of a new preventslide clavicular nail for treatment of clavicular fracture. This study was made to provide some biomechanical evidences for better clinical operation. To evaluate the clinical effect of prevent-slide clavicular nail(PSCN) in threatment of clavicular fracture. Methods: 9 adult clavicles were divided into 3 groups randomly, and made a model for the middle and lateral fractures. Those 3 groups was fixed with prevent-slide clavicular nail(PSCN), 4 holes steel plate(4SP) or kirschner's pin(KP),respectively. The biomechanical test was performed and the stress was analyzed. Twenty-onepatients of clavicular fracture were threated with the self-designed PSCN .All the patients were given regular follow-up and image examinations, of which the therapeutic effects were evaluated. Results: (1) bending strength of internal fixation with 4SP and PSCN were close to normal specimen group(NS) (P>0.05); but KP group was less than normal specimen group (P<0.05) (3) Anti-putout strength and stiffness of internal fixation 4SP and PSCN were larger than KP group (P<0.05); Anti-putout power of internal fixation with PSCN were larger than KP group (P<0.05). (4) Stress shielding of internal fixation with PSCP were less than 4SP group (P<0.05). All the patients were followed up from 6 to 18 months with an average 10 months, The rate of healing reached 100% .According to standard of clinical effect and integrative evaluation : excellent 16 cases, good 4 cases, fair 1 case, poor 0 case . The rate of excellent and good was 95.2% . Sliding-out of clavicular nail was in 1 case .Conclusions: (1) The strength and stiffness of PSCN was larger than that of KP, and was close to 4SP. The stress shielding of PSCN was the less. The internalfixation with PSCN is an ideal method for treating clavicular fracture. (2)The PSCN can provide reliable fixation with fewer injuries and is simple , safe and easy to use.
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