Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


The pressure of the articular surfaces against one another favours the
progress of ulceration of cartilage and of articular caries. These
processes are usually more advanced in the areas most exposed to
pressure--for example, in the hip-joint, on the superior aspect of the
head of the femur, and on the posterior and upper segment of the
acetabulum.


The occurrence of _pathological dislocation_ is due to softening and
stretching of the ligaments which normally retain the bones in position,
and to some factor causing displacement, which may be the accumulation
of fluid or of granulations in the joint, the involuntary contraction of
muscles, or some movement or twist of the limb. The occurrence of
dislocation is also favoured by destructive changes in the bones.

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