Anatomico-chirurgical observations on dislocations of the astragalus / by Thomas Turner.

  • Turner, Thomas, (1793-1873)
Date:
1843
Catalogue details

Licence: Public Domain Mark

Credit: Anatomico-chirurgical observations on dislocations of the astragalus / by Thomas Turner. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    kinds of luxation, to which this bone is liable, but it will enable us to understand the mechanical difficulties which the contact of irregular processes and concavities opposes to its reduction. The author of this paper will employ the term form as applicable to dislocation, in being incom- plete or partial, or complete : the term course refers to the direct or indirect ejection of the bone from its articular surfaces ; the latter implying a change in the position or axis of the astragalus, in being everted, inverted, retroverted, or turned upon itself: and the term kind is adopted in reference to the simple, compound, or complicated nature of the accident. When the astragalus is partially luxated forwards, the inner hook-like process, bounding the posterior or outer articulatory process for the calcaneum, is received into a hollow between the two articulating processes of the latter bone; and the posterior surface of the astragalus is brought into contact with the anterior, instead of the posterior facet of the os calcis. In this way the navicular facet of the astra- galus juts forward, and above the anterior range of the tarsal bones, and rests upon the schaphoid bone ; there is a considerable vacuity at the inner part of the foot behind the astragalar cavity of the navicu- lar bone, and below the malleolus internus. The tibia and fibula will, in all probability, be carried forwards so as to increase the distance between the tibia and tendo achillis, thus lengthening the heel, whilst the foot and toes are turned inwards; or the tibia and fibula may remain partially supported by the posterior part of the astragalus, and thus be prevented from descending on the os calcis, as they do in complete luxation.