Part of my fellowship role is performing as a TA for NxtGen Institute of Physical Therapy’s Orthopaedic Residency program. Recently I presented to residents on material included in the Orthopaedic Section’s ISC 14.2.4 Basic Science of Bone and Cartilage. Among the information discussed was the effect of immobilization on articular cartilage; and I like to discuss immobilization in further detail within this post.
In the ISC 14.2.4 Fitzgerald did an excellent job in outlining detrimental changes to the articular cartilage after periods of immobilization. Some of these changes include thinning of articular cartilage, reduction in synthesis of proteoglycans, reduced amounts of articular cartilage matrix, and increases in water content with in the articular cartilage.1 Dr. Fitzgerald goes on to state “it’s reasonable for the therapist to assume that there have likely been some changes to the structural and mechanical properties of articular cartilage in the immobilized joints that make them temporarily less capable of bearing and distributing loads across the joint.”1 As physical therapists we would all agree with that statement based off our knowledge of anatomy and physiology.