The Fundamental Principles of Mechanico-Therapy in Hip Disease (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ...imperceptible, even though particular attention be paid to detecting it. If, instead of walking on the ground, we walk in the ordinary way upon a stone pavement, the jarring will be much more apparent than in walking on tfie earth. Still more perceptible will it be if we do not flex our knee and ankle joints, so that we walk "stiff-legged," as it is termed. And, instead of walking on the stone pavement, should we increase our pace and run, we shall find the amount of jarring or shock to the body has been materially augmented. From these and the foregoing observations we are enabled to see that--The visible rectilinear velocity of the limbs during locomotion is converted by impact into molecular vibrations (known in common parlance as jars), which are imparted by the individual to the surface walked upon, and reciprocally imparted to and conducted back along the bony frame work of the body with each successive step These commonly observed, reciprocal, kinetic sequences'of the successive impacts of the feet against the earth serve to illustrate, in a very meagre way to be sure, the now universally accepted hypothesis among scientists, that the various manifestations of energy are correlated, and that force is indestructible. Hence we are justified in the assertion that, though there has been a transformation of force, the resulting mechanical effects of impact, summed up, point to the verifiable existance of an equivalency of energy. Vibratory Impulses, or Jars, when severe or too long continued, prove Disastrous to Healthy Tissues.--But let us regard still more fully the traumatisms resulting from voluntary muscular efforts. If the subject of our observation, instead of walking along the stone pavement, executes a series of jumps on two...