A nurse is reinforcing teaching to a client who was recently diagnosed with osteoarthritis about the disease process. Which of the following statements about the pathophysiology of osteoarthritis should the nurse include in the teaching?

Choice A rationale This statement is physiologically incorrect because osteoarthritis does not involve rapid bone growth that enhances movement. Instead, the body may attempt to repair damaged cartilage by creating osteophytes or bone spurs. These bony projections actually restrict the range of motion in the joint and increase friction. Rather than reducing discomfort, these changes contribute significantly to the chronic pain and mechanical stiffness associated with progressive joint degeneration in patients. Choice B rationale The pathophysiology of osteoarthritis is not defined by repeated joint infections or scar tissue accumulation. While septic arthritis involves infection, osteoarthritis is primarily a non-inflammatory, degenerative condition. The stiffness felt by patients results from the mechanical breakdown of the joint structures rather than the presence of fibrotic scar tissue from previous infections. Attributing the disease to infection ignores the primary role of mechanical stress and chondrocyte dysfunction in the breakdown of articular cartilage. Choice C rationale This is the accurate description of the disease process as it involves the progressive degradation of hyaline cartilage. As the protective cartilage thins, the subchondral bone is exposed, leading to increased pressure and friction during movement. This bone-on-one contact triggers nociceptors and leads to the characteristic pain and crepitus. Understanding this wear and tear mechanism helps patients realize why weight management and joint protection are vital for managing their specific symptoms. Choice D rationale Osteoarthritis is not an autoimmune disorder; that description applies to rheumatoid arthritis. In rheumatoid arthritis, the immune system targets the synovium, causing systemic inflammation. In contrast, osteoarthritis is localized and characterized by the mechanical failure of the joint. While minor secondary inflammation may occur due to cartilage debris, the underlying cause is not a systemic immune attack. Proper identification is crucial because treatments for autoimmune conditions, like DMARDs, are not effective for osteoarthritis.