Lateral curvature of the spine and round shoulders . lengthof the spine, the feet of the cadaverbeing fastened to the table. Whilethe traction on the head was thus inforce the same side pull of 25 poundswas made as before and the resultsnoted. Two experiments of this sortwere made. It was found that thespine without traction was displacedto the side nearly twice as far bya definite side pull as by the sameamount of side pull when tractionwas being made. A confirmatory experiment wasmade on a healthy boy of fifteen,using 75 pounds of head traction and15 pounds of side pull. The resultwas the sa
Lateral curvature of the spine and round shoulders . lengthof the spine, the feet of the cadaverbeing fastened to the table. Whilethe traction on the head was thus inforce the same side pull of 25 poundswas made as before and the resultsnoted. Two experiments of this sortwere made. It was found that thespine without traction was displacedto the side nearly twice as far bya definite side pull as by the sameamount of side pull when tractionwas being made. A confirmatory experiment wasmade on a healthy boy of fifteen,using 75 pounds of head traction and15 pounds of side pull. The resultwas the same. The conclusion is that extension ofthe spine by an upward pull on thehead is a corrective force in the nor-mal spine, but that much more forceis required to accomplish a certainamount of side correction than is thecase if the force is applied from theside. The other conclusion is that tosecure the maximum of side dis-placement from a given amount ofside pressure the spine must be slackand not stretched in its length. Fig. 128.—Head (4) PASSIVE STRETCHING BY SUSPENSION The patient stands or sits erect, and the head is pulled vertically upward bymeans of a Sayre head-sling, which embraces the chin and occiput. Tractionshould be made by a compound pulley, and the patient or the surgeon niay holdthe rope. Suspension is mildest—(i) when the feet are not made to leave thefloor; next in grade comes (2) the position of tiptoe induced by the traction, and(3) a greater pull is secured by lifting the whole body until the feet swing free. 156 TREATMENT In this case the traction force equals the body-weight. The maximum tractioncan be secured (4) by strapping the thighs down to a seat on which the patientsits. An upward pull greater than the body-weight can now be exerted on thehead (Fig. 128). Apparatus for the purpose has been devised, and is known as theWeigel-Hoffa frame, in which the patient is suspended by the head,
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