Abstract:Objective To analyze the differences in wrist morphological parameters between anteroposterior (AP) and posteroanterior (PA) radiographs.Methods AP and PA radiographs of right hand-wrist joints of 30 healthy volunteers recruited in July 2020 were taken by standard X-ray technique.The maximum width of distal radius,minimum width of distal radius,width of sigmoid notch,height of radial styloid process,ulnar deviation angle,scapholunar joint space,ulnar variation,carpal angle,lower radioulnar joint space and ulnar styloid process index were measured on AP and PA radiographs respectively.Results There were no significant differences in the minimum width of distal radius,the maximum width of distal radius,the width of the sigmoid notch,the ulnar deviation angle and the height of radial styloid process between AP radiographs and PA radiographs(P>0.05).However,the scapholunar joint space and carpal angle in PA were statistically less than those in AP,ulnar variation and ulnar styloid process index were significantly greater than those in AP(P<0.01 ).The displaying rate of scapholunar space (36.67% vs 83.33%,χ2=13.611,P<0.01 ) and lower radioulnar joint (33.33% vs73.33%,χ2=9.643,P<0.01 )in PA were sigificantly lower than those in AP.Conclusion The significant differences in some measurement indexes of normal wrist between AP and PA X-ray pictures can be used to guide the diagnosis and treatment of wrist bone and ligament injuries in the emergency.