By John H. Dumbleton

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It has been suggested that the character of the cartilage is all important in determining the lubrication of the joint. A series of experiments at Leeds using different types of cartilage and synovial fluid in a reciprocating machine rubbing cartilage on glass lifted the specimens at 1 sec. and 1 min. (ref. 3 8 ) , and showed that the nature of both the cartilage and the fluid are important. (see Tables 2 and 3 ) . TABLE 2 Shear stress (kg/sq. cm) with normal cartilage Tacky Normal Watery 1 sec.

80).

G. metacarpo-phalangeal and radio-carpal joints. This is a spheroidal joint, one of the axes being longer. g. humero-ulnar. g. knee and temporo-mandibular joints. One bone articulates with the other by two distinct surfaces whose movements are not dissociable. These surfaces are termed condyles. g. superior radio-ulnar and atlanto-odontoid joints. g. first carpo-metacarpal joint. e. move about three mutually perpendicular axes. Thus a hinge joint has one degree of freedom, and a ball and socket joint three degrees of freedom.

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