The principles of myodynamics / By J.S. Wight.

  • Wight, J. S. (Jarvis Sherman), 1834-1901.
Date:
1881
Catalogue details

Licence: Public Domain Mark

Credit: The principles of myodynamics / By J.S. Wight. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    was one inch and a half, while the depth of the external condyle was one inch: This permitted pressure to be made only on the internal con- dyle. When the pressure was some 600 pounds the internal condyle gave way and settled to a level with the external condyle : And the two condyles then sustained a pressure of over 2,200 pounds. As the cut surface was not quite transverse antero-posteriorly, the condyles split nearly in two from side to side. It would appear, therefore, in this case, that one condyle would be inadequate to sustain the pressure of the quadriceps extensor, as obtained above, by theoretical considerations—namely, over 1,000 pounds—and that both condyles of the femur would be adequate to do the work required by the myodynamic relations. 143. The practical conclusions are : (i.) That, under ordinary conditions, the cancellous tissue of bone-ends can sustain the pressure applied to it by the daily use of the muscles. (2.) That the structural conditions of the bone-ends may so change, on account of disease or injury that the action of the muscles may cause absorp-