A practical treatise on fractures and dislocations . the foot is violently twisted outward, the astragalus becomes tilted upon its outerand upper margin in such a way that this margin slides inward andplaces itself underneath the middle portion of the lower articulatingsurface of the tibia ; its upper and inner margin descends toward theextremity of the malleolus internus, and the outer surface of the astragaluspresents obliquely upward and outward, instead of directly outward as itwould do in its natural position. This cannot occur without a ruptureof the internal tibio-tarsal ligaments, or a
A practical treatise on fractures and dislocations . the foot is violently twisted outward, the astragalus becomes tilted upon its outerand upper margin in such a way that this margin slides inward andplaces itself underneath the middle portion of the lower articulatingsurface of the tibia ; its upper and inner margin descends toward theextremity of the malleolus internus, and the outer surface of the astragaluspresents obliquely upward and outward, instead of directly outward as itwould do in its natural position. This cannot occur without a ruptureof the internal tibio-tarsal ligaments, or a fracture of the malleolusinternus, or both; indeed, a fracture of the internal malleolus is a verycommon circumstance in connection with this form of dislocation. Muchmore frequently, however, the fibula itself gives way at a point withinfrom two to five inches of its lower extremity ; or sometimes the fracturein the fibula occurs through that portion which forms the malleolusexternus. For more particular information as to the causes and relative. Dislocation of the lower end of the tibia inward(foot turned outward). (Potts fracture.) 772 DISLOCATIONS OF THE LOWER END OF THE TIBIA. frequency of these fractures, I refer the reader to the chapter on frac-tures of the fibula. Rarely it happens that, instead of this lateral rotation of the astragalus,there occurs a true lateral displacement of the tibia inward upon theastragalus, and the outer portion of the lower articulating surface of thetibia conies to rest upon the inner portion of the upper articulating sur-face of the astragalus; or it may slide completely off in the same direc-tion ; a result which is usually attended with a laceration of the musclesand integuments, converting the accident into a compound some cases this extreme displacement occurs without such this form of the accident, the true lateral dislocation, the fibula mayremain unbroken and undisturbed, the tibia merely having become
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Keywords: ., bookcentury1800, bookdecade1890, booksubjec, booksubjectfractures
