The Effect of Joint Position on Juxta-Articular Bone Marrow Pressure:Relation to Intra-articular Pressure and Joint Effusion—An Experimental Study on Horses

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Abstract
Metacarpo-phalangeal joints [6] of adult horses were studied. Pressure measurements were made in the joint and the metacarpal bone with simultaneous measurement of the systemic arterial blood pressure. Investigations performed to study the effect of joint position on juxtaarticular bone marrow pressure showed that an increase in joint flexion was always followed by a rise in intraosseous pressure with a significant increase at flexion above 60.degree.. Increase in intraarticular pressure which was achieved by injection of saline was always followed by a slower rise in intraosseous pressure. Even a few milliliters of saline in the joint caused a rise in intra-articular pressure. Joint position changes and effusion may block the drainage vessels from the bone marrow as they pass through the joint.

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