Hospital for Sick Children, Toronto, Ontario, Canada. Reprinted from the Jefferson Orthopaedic Journal 7:7, 1978. Presented as the Seventh Annual Anthony F. De-Palma Oration at the Eighteenth Annual Meeting of the Jefferson Orthopaedic Society, December, 1977. Received: August 10, 1979.
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Robert B. Salter (1980) studied this question.