Arthrosis

Arthrosis is damage of the articular cartilage and secondary disintegration of the articular surface of bones.

Stage I

 * Mild clinical symptoms
 * X-ray may show discrete sclerotization of the cotyloid cavity
 * The articular space and the condyle remain intact

Stage II

 * The mobility of the joint decreases due to pain
 * The rigidity of the joint
 * There appear small cysts in the cotyloid cavity
 * X-ray may show fine osteophytes

Stage III

 * The mobility of the joint significantly limited.
 * Secondary inflammation may occur.
 * X-ray may show cavitary or condylar cysts
 * Irregularly narrowing of articular cavity.

Stage IV

 * The joint is almost stiff, and immobile.
 * Usually signs of secondary inflammation are present often takes place,
 * Signs of muscle decompensation are observable.
 * X-ray may show severe deformation of the joint as:
 * deformation of the condyle and acetabulum
 * cystic degeneration
 * detritus in the articular cavity
 * bizarre osteophytes
 * extremely narrow articular space