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Updated: June 23, 2025
This affection is probably caused in most instances by direct injury to the parts, such as may be occasioned by being kicked, falling on pavement, or being struck by the body of a heavy wagon. Strains in pulling or in slipping are undoubtedly causative factors and in draft horses such strains may result in involvement of this synovial apparatus. Symptomatology.
The synovial membrane proliferates, grows over the cartilage, and replaces it, and when two such articular surfaces are in contact they tend to adhere, thus obliterating the joint, cavity, and resulting in fibrous or bony ankylosis. Clinical Features.
Some hours before death pus was taken from an abscess on the arm, and blood from a puncture in a finger. Both were sowed. The flask containing the blood was sterile. The autopsy was at ten o'clock on the morning of the sixteenth. Blood from a vein of the arm, pus from the uterine walls and that from a collection in the synovial sac of the knee were all placed in culture media.
Round or flat ligaments may extend from one articular surface to the other, and attached to the margins of the articulation are membranous, flat or round ligaments. Muscles and tendons that cross the articulations should be included among the structures binding them together. Movable joints possess a synovial membrane.
Excepting in cases of acute inflammation attending synovitis of these parts, no lameness marks its existence and in chronic cases of synovial distension the service of affected animals is not interfered with. These distensions constitute unsightly blemishes and they are treated chiefly for this reason.
In the tertiary stage the joint lesions are persistent and destructive, and result from the formation of gummata, either in the deeper layers of the synovial membrane or in the adjacent bone or periosteum. Peri-synovial and peri-bursal gummata are met with in relation to the knee-joint of middle-aged adults, especially women.
A subsynovial lipoma grows from the fat surrounding the synovial membrane of a joint, and projects into its interior, giving rise to the symptoms of loose body.
The gonococcus is carried to the joint in the blood-stream and is first deposited in the synovial membrane, in the tissues of which it can usually be found; it may be impossible to find it in the exudate within the joint. The joint lesions may be the only evidence of metastasis, or they may be part of a general infection involving the endocardium, pleura, and tendon sheaths.
The abscess may develop so insidiously that it does not attract attention until it has attained considerable size, especially when associated with disease of the spine, pelvis, or hip. The position of the abscess in relation to different joints is fairly constant and is determined by the anatomical relationships of the capsule and synovial membrane to the surrounding tissues.
The extension of the ossification into the synovial reflection and capsular ligament adds a collar or "lip" of new bone, known as "lipping" of the articular margins, and also into other ligaments, insertions of tendons and intermuscular septa giving rise to bony outgrowths or osteophytes not unlike those met with in the neuro-arthropathies.
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