. The principles of surgery . t Exterior to the Articulation. This may be the result of rheumatism, affect-ing the periosteal investment of the articulatingextremities of the bones, as formerly described(p. 473). Or, like the last two affections, it maybe rather the mere concomitant of old age; ana-logous to ossification of cartilage, as in the ribs,and trachea. To the latter form, the hip-joint is especially ligamentum labri cartilagineum becomes ossified; deepening theacetabulum, locking the head of the bone, and greatly limiting themovement of the joint. Dislocation is rendered i
. The principles of surgery . t Exterior to the Articulation. This may be the result of rheumatism, affect-ing the periosteal investment of the articulatingextremities of the bones, as formerly described(p. 473). Or, like the last two affections, it maybe rather the mere concomitant of old age; ana-logous to ossification of cartilage, as in the ribs,and trachea. To the latter form, the hip-joint is especially ligamentum labri cartilagineum becomes ossified; deepening theacetabulum, locking the head of the bone, and greatly limiting themovement of the joint. Dislocation is rendered impossible, without dis-ruption of the elevated brim of the acetabulum; but fracture of the neckof the femur—a more formidable accident—is, on the contrary, the same time, the bone around the acetabulum is often studded,more or less copiously, with osseous nodules of recent formation. Such a state of matters is obviously not amenable to treatment, with 1 See Analysis by Davy, Listons Elements of Surgery, p. Fig. 165. Chronic ostitis; serious structural change on the exterior of the affectedbones. The result of chronic rhematism.—Linton. CHANGE OF FORM IN JOINTS. 493 the hope of cure. It is sufficient that the duties of the part shall bemade to correspond to its modified powers of performance; exposure tocasualty, by external violence, being at all times sedulously avoided. Interstitial Absorption of Bone, Implicating the Joint. This also applies especially to the hip-joint. In consequence of ex-ternal violence, as a smart blow, or fall on the trochanter major, theneck of the femur may undergo much change by interstitial absorption. Fig. 166.
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