Characteristics of the humeral spiral fractures caused by grenade throwing and its biomechanical impli-cations
- VernacularTitle:投弹致肱骨螺旋骨折的形态特征及生物力学意义
- Author:
Shimin ZHANG
;
Daxiong LIU
- Publication Type:Journal Article
- Keywords:
Humerus;
Throwing fracture;
Spiral fracture
- From:
Chinese Journal of Orthopaedic Trauma
2002;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the X-ray characteristics of humeral spiral fracture cau sed by hand grenade throwing.Methods Forty-six soldiers suffered humera l fracture caused by grenade throwin g in military training.Their X-ray film s were evaluated and fracture featur es were measured.Results All fractures involved the mid-distal humeral shaft.The spiral fracture lines were sy mmetrical in the proximal and distal parts.The lengths of fractures were above 30mm,with 51～90mm in 31cases(67.4%).All fracture angles were less than 45?,with 40?～45?in 42cases(91.3%).The spiral arcs of fractures were 285?～326?with an average of 305.5?(0.85circle).Four cases had a butterfly fracture piece on the medial side.Conclusions Spiral fractures due to grenade thro wing mainly occur at the acceleratio n phase of throwing,and are mainly caused by the combination of torsion al and compressive forces.Humeral t hrowing fractures are characterize d by long fracture line,sharp fracture a ngle,and large spiral arc.
