. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. ABNORMAL CONDITIONS OF THE KNEE-JOINT. 65 Abscess may, however, form in the interior of the heads of the tibia or lower extremity of the femur without being preceded by the death of any portion of the bone, as is proved by a specimen in the museum of the Richmond Hospital. A child, aged about twelve, had long suffered from chronic disease of the upper portion of the tibia. A chronic symptomatic abscess pointed and opened spontaneously in the popliteal space, and here a fistulous open- ing remained discharging a quantity
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. ABNORMAL CONDITIONS OF THE KNEE-JOINT. 65 Abscess may, however, form in the interior of the heads of the tibia or lower extremity of the femur without being preceded by the death of any portion of the bone, as is proved by a specimen in the museum of the Richmond Hospital. A child, aged about twelve, had long suffered from chronic disease of the upper portion of the tibia. A chronic symptomatic abscess pointed and opened spontaneously in the popliteal space, and here a fistulous open- ing remained discharging a quantity of thin sanious pus. While under treatment for this chronic disease, a sudden attack of acute ar- thritis set iu, which threatened the patient's life, and amputation was immediately per- formed. Upon examination of the knee-joint and of the interior of the bones, which were exposed by a vertical section made from before backwards, an abscess was discovered in the centre of the head of the tibia, capable of con- taining a walnut. This communicated with the popliteal abscess, which had long had a fistulous opening in the ham ; but the abscess in the interior of the tibia was now found to have another opening into the cavity of the knee-joint, which had all the appearance of having been quite recent. The matter of the abscess of the tibia having suddenly made its way into the cavity of the knee-joint was the immediate exciting cause of the acute arthritis genu, evidences of which were seen in a layer of lymph which invested the synovial mem- brane and the cartilages. The patient ulti- mately recovered. When the chronic form of necrosis affects the tibia and the epiphysis is included in the disease, the knee-joint sometimes remains but little altered, but in other cases remarkable changes in its form take place. The leg is sometimes fully extended, and is even in ad- vance of the natural line, but it is more gene- rally flexed on the femur, and the tibia is at the same time somewh
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