The correct answer is:
Virchow in 1891 initially proposed the physeal theory where portion of plate separates and rotates 90 degrees; however he could not substantiate this. The plate defect theory was proposed by Keith in 1920 and supported by studies done by D'Ambrosia and Ferguson in 1968. They produced exostoses by physeal cartilage transplantation therefore demonstrating and supporting the concept.
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