Internal Derangement of the Knee in Children and Adolescents By H. A. T. FAIRBANK, M.S.THE purpose of this short paper is to call attention to the chief differences to be found when a series of cases of derangement of the knee-joint in young patients is compared with those of adult age. It is generally agreed that derangement calling for operation is rare in the young child, and that the frequency increases during adolescence and early adult life. TABLE I.-NON-ARTHRITIs KNEE CASES UNDER AGE OF 20 YEARS. Cases Congenitally abnormal external semilunar cartilage (13 cartilages) . . . -... ... 12 Fractures of normal semilunar cartilages (proved at operation. Int. = 12.
The thermal conductivity of liquid He 3 at a pressure of § atmosphere has been determined experimentally and found to increase slowly from 7X10~5 watt/cm°K at 0.24°K to 16X10" 5 watt/cm°K at 2.7°K with no evidence of superfluidity. Several models of liquid He 3 based on Fermi-Dirac statistics predict a 1/T dependence for the thermal conductivity of He 3 at the lowest temperatures, but no such behavior has been observed down to 0.24°K in the present work. A study of the convective heat transport in the liquid has indicated that the coefficient of thermal expansion becomes negative below about 0.5 °K. A thermal boundary resistance across a copper-liquid He 3 interface has been found which is similar in magnitude and temperature dependence to that found for a copper-superfluid He 4 boundary.
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