Fractures and dislocations / by T. Pickering Pick.

  • Thomas Pickering Pick
Date:
1885
Catalogue details

Licence: Public Domain Mark

Credit: Fractures and dislocations / by T. Pickering Pick. Source: Wellcome Collection.

    439/548 (page 427)
    variety of dislocation generally rests on the dorsum of the ilivim, just above the small facet which marks the origin of the reflected tendon of the rectus muscle (Fig. 7-1:); but its position varies, and the height to which it ascends depends mainly upon the nature of the dislocating force, and the amount of lacei'ation of the capsule and external rotator muscles. It is always situated above the obturator internus muscle, while the sciatic form is below it, and it is by the relative posi- tion of the head of the bone to this muscle that Bigelow distinguished the two forms of disloca- tion ; describing them as dislocation backwards, above or below the obturator internus. They appear both to be pro- duced in the same way, and the dislocation under consideration must be regarded as a more ad- vanced grade of the sciatic form. Cause's.—One of the most frequent ways in which a dislocation of the hip backwai'ds on to the dorsum ilii is produced is, as Sir Astley Cooper has pointed out, in consequence of the person falling whilst carrving a heavy weight on his shoulder, or from a severe blow under the .same cii'cumstances. In these cases the lirnb would in all probability be flexed and abducted, in order to enable the patient to bear the weight by bending the body forwards and widely Fig. 74.—Dislocation on to the Dorsum of the Ilium. Tlie head of the heme is resting on the ilnrsuin ilii, ahuve the obturator iDterniis musclo.