Cubitus varus deformity is a common complication after supracondylar fracture of the humerus. The reason of this complication is thought to be due to the varus and internal rotation of the distal fragment. The varus position of the distal fragment can be controlled, but not by X-ray examination, and the internal rotation by ultrasonographical examination of the humeral torsion. However it has been reported that humeral torsion changes with age. Consequently we measured the humeral torsion using ultrasonography to investigate the changes in the humeral torsion with age as well as laterality.
103 males and 98 females, aged between 2 to 18 with a mean age of 10.7 years, were investigated. The results show that humeral torsion increases with age, and there exists no significant difference in laterality and gender in humeral torsion.
These results are considered useful for the treatment humeral shaft fracture and the correction of internal rotational deformity after supracondylar fracture of the humerus by measuring the contra lateral side.