. A practical treatise on fractures and dislocations. obilizethe part by plaster of Paris, taking care to keep the foot well pressedinward while the plaster is setting in order that the malleolar mortiseshall not be widened. In the third variety the effort must be made tocorrect the displacement of the tibial fragment by pressing it down-ward and outward, and to immobilize with the foot well forward,guarding against backward displacement, and the external malleoluspressed snugly against the tibia, guarding against outward displacement. 398 FRACTURES. F. Fracture of the Posterior Portion of the
. A practical treatise on fractures and dislocations. obilizethe part by plaster of Paris, taking care to keep the foot well pressedinward while the plaster is setting in order that the malleolar mortiseshall not be widened. In the third variety the effort must be made tocorrect the displacement of the tibial fragment by pressing it down-ward and outward, and to immobilize with the foot well forward,guarding against backward displacement, and the external malleoluspressed snugly against the tibia, guarding against outward displacement. 398 FRACTURES. F. Fracture of the Posterior Portion of the Articular Surface of the This may be a complication of Potts fracture, the fragment beingrather small, or the crush may be so extensive that the symptoms andtreatment are very different. In the slighter form the breaking of thetibia is apparently produced by the weight of the body pressing theposterior and outer part of the articular surface against the displacedastragalus, and yet I have known it to be caused by the comparatively Fig. Fracture and displacement of the posterior portion of the lower articular surface of the tibiaand of the fibula and internal malleolus. (See also Plate XXXIV., fig. 2.) slight violence of a fall from an almost stationary bicycle. I havenever seen it in a fresh injury and do not know whether it could berecognized ; the signs of Potts fracture would be recognizable, ofcourse, and possibly the additional fracture might be shown by dis-placement of the foot (astragalus) slightly upward as well as backwadand outward. The treatment is that of Potts fracture with special care to bring thefoot well forward. The more severe form is rare and apparently the result of a fall froma height upon the foot. I have one old specimen of extensive crushing 1 See also Backward Dislocation of the Foot. FRACTURES OF THE BONES OF THE LEO. 399 with fracture of the external malleolus and ils displacement repair has obliterated mosi of the deta
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