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The Journal of Bone and Joint Surgery 81:1165-69 (1999)
© 1999 The Journal of Bone and Joint Surgery, Inc.

Osteonecrosis of the Lateral Aspect of the Talar Dome After Triple Arthrodesis. A Report of three Cases*

CHRISTOPHER K. JONES, M.D.{dagger} and JAMES A. NUNLEY, M.D.{dagger}, DURHAM, NORTH CAROLINA

Investigation performed at the Division of Orthopaedic Surgery, Duke University Medical Center, Durham


   Introduction
 
Disruption of the blood supply to the talar dome leads to bone infarction that may be segmental or involve the entire dome. There is ischemic death of the cellular constituents in the infarcted area, which leads to osteonecrosis. Histologically, this process is recognized on the basis of the disappearance of osteocytes from within the lacunae. Radiographs give the appearance of osteoporosis of the surrounding bone due to hyperemia, whereas the infarcted bone retains its density. Disruption of the blood supply can be secondary to trauma6,12,14,20, external compression, or intraluminal obstruction1,3. Disruption due to external compression can occur when a space-occupying lesion physically compresses the arterial supply and inhibits blood flow. Intraluminal obstruction occurs when there is an intravascular process that interrupts blood flow. Fat emboli can occlude blood vessels; this has been seen in histological studies performed on specimens of osteonecrotic femoral heads3.

Osteonecrosis of the talus . . . [Full Text of this Article]


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