. Operative surgery, for students and practitioners . be steadied with both hands ofan assistant who supports himself by resting his elbows upon thetable. The end of the bone should be forced sufficiently far upwardout of the wound so as to make the use of a towel to protect the softparts during its section unnecessary. The piece of bone resectedmust be of the same thickness anteriorly, posteriorly, and upon eitherside, otherwise, when the operation is completed, the limb will befound to be in a position of knock-knee or bow-leg, or there will betoo much or too little extension. The section sh
. Operative surgery, for students and practitioners . be steadied with both hands ofan assistant who supports himself by resting his elbows upon thetable. The end of the bone should be forced sufficiently far upwardout of the wound so as to make the use of a towel to protect the softparts during its section unnecessary. The piece of bone resectedmust be of the same thickness anteriorly, posteriorly, and upon eitherside, otherwise, when the operation is completed, the limb will befound to be in a position of knock-knee or bow-leg, or there will betoo much or too little extension. The section should pass through a plane which is parallel withthe articular surface of the bone, and not at right angles with the long AMPUTATIONS, RESECTIONS, ETC. 609 axis of the bone, and therefore in making the section one should dis-regard the long axis of the bone, and rather keep his eye on the planeof the articular surface. The end of the tibia is now likewise stripped of its soft parts andprojected upward out of the wound well beyond the sawn surface of. Fig. 261.—Resection of Knee-joint. A, A1, long axes of the femur andtibia; B, line drawn at right angles to the long axis of the femur. C, linesthrough the lower end of the femur and upper end of the tibia parallel withthe plane of the articular surfaces. Through these planes the section shouldbe made in resecting the knee-joint. the femur, and a section of the bone removed, as in the case of thefemur, parallel with the plane of its articular surface. At times it is necessary to excise two or three inches of the bones(femur and tibia together), but one should remove as little as the con-ditions present will permit, especially in children. The sharp spoonmay be used to extirpate foci which extend into the substance of the 610 LOWER EXTREMITY. bone beyond the surface exposed by the section, and, if the cortex ishealthy, one may remove much of the medullary portion of a bonerather than sacrifice more of the length of the limb by remo
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