الفهرس 
Anatomy of Distal Radius
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Abstract
Summary The purpose of this study was to evaluate the results of management of unstable distal radius fractures using polyaxial volar locking plate. Thirty patients were included in the study. At the time of calculating the statistical analysis and the results only 25 patients had fulfilled the follow up requirements and were included. On admission, all patients were assessed by: history taking, clinical examination and appropriate radiological assessment. The mean age was 40.8 years. The youngest patient in this study was 24 years old while the oldest was 65 years old. Sixteen patients were males (64%) and nine patients were females (36%). Fourteen patients had dominant side affection (56 %), while eleven patients had non-dominant side affection (44%). The mechanism of trauma in the patients was falling on an out stretched hand in 11 patients (44%), road traffic accident in 5 patients (20%), falling from a height in 6 patients (24%), and direct trauma in 3 patients (12%). Facture type according to Frykman‘s classification was; Type I: one patient (4%), Type III: 7 patients (28%), Type IV: 3 patients (12%), Type V: one patient (4%), Type VII: 7 patients (28%), Type VIII: 6 patients (24%). Locking plate does not depend on screw purchase and friction between the plate and bone for distal fragment support but rather on direct internal buttressing provided by the fixed-angle elements. This is of special value in comminuted fractures and osteoporotic bone. Polyaxial volar locking plates are biomechanically sound for the management of intra-articular fractures of the distal radius. These plates enable insertion of screws at variable angles. Increase in the screw-locking angle results in decreased ultimate or fatigue strength. Poly axial screws allow adaptation of the plate position to volar fracture lines. This adaptation in position can be achieved by minimizing the risk of screw perforation