Imaging Evaluation Of Radius Subtrochanteric Transverse Fracture After Malreduction

Objective: The aim of this experimental study was to assess the radiographic evidences of rotational deformity of radius subtrochanteric fracture based on artificial bone models.Methods: A total of 12 right-sided artificial radius bones were used in this study.A transverse osteotomy was made at the level 0.5 cm distal to the trochanter.The proximal fragment was rotated 0,5,10,15,20,25,30,35,40 and 45 degrees clockwise,and then fixed with sticky paper.The standard anteroposterior and lateral X-rays of the radius were taken.The minimal distance between the radial styloid and the long axis of the radius,and the minimal distance between the radial trochanter and the long axis of the radius were measured.The measurements were compared to the baseline,i.e.,0degrees of rotation.Statistical significance was set at P <0.05.Results: When the rotation was less than or equal to 30 degrees,there was no significant difference regarding the minimal distance between the radial styloid and the long axis of the radius(P <0.05);and no significant difference regarding the minimal distance between the radial trochanter and the long axis of the radius(P <0.05).Conclusions: When reducing a radius subtrochanteric fracture,a rotational deformity less than or equal to 30 degrees may not be observed on anteroposterior lateral X-rays.