The sharp limitation of the occurrence of slipping of the upper femoral epiphysis to the accelerative phase of the pubertal growth spurt, such variations as occur duplicating strikingly a frequency curve of the time of occurrence of the "year of maximum growth—the MG year"1 (Fig. 1), suggests conditioning of the episode by a metabolic abnormality peculiar to this period. The fact that it occurs most frequently in the overweight child recalls an old observation of a reciprocal relationship between gain in weight and calcium retention2; the more rapidly the growing animal was permitted to gain in weight, the more florid the rickets that resulted from the Steenbock diet. A similar phenomenon is observed when testosterone is administered to the normal boy; marked increase in the retention of nitrogen is accompanied by reciprocal fall in calcium storage.3 It is the thesis of this paper that suboptimal mineralization is
JOHNSTON JA, MANSON G, MITCHELL CL. Epiphysiolysis. AMA Am J Dis Child. 1956;92(4):337–346. doi:10.1001/archpedi.1956.02060030331003
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