Osteoarthritis and Degenerative Joint Disease

Osteoarthritis is the most common form of arthritis and the leading degenerative joint disease, characterized by progressive loss of articular cartilage together with changes in the underlying bone and surrounding joint tissues. For nursing, it is largely a chronic condition in which pain, stiffness, and reduced function are managed over time, often with attention to physical activity, weight, and joint protection.

Definition

Osteoarthritis is a chronic, progressive joint disorder involving loss of articular cartilage, subchondral bone remodeling, osteophyte formation, and low-grade synovial inflammation, producing joint pain, stiffness, and functional limitation.

Scope

This topic covers the nature of osteoarthritis as a whole-joint disorder, its principal risk factors and joint distribution, the pathophysiology of cartilage and bone change, and the broad shape of its management. It is a reference overview and does not provide drug regimens, injection techniques, or individualized treatment recommendations.

Core questions

• Why is osteoarthritis now understood as a disease of the whole joint rather than simple cartilage wear?
• Which joints are most often affected and what are the major risk factors?
• How do cartilage, subchondral bone, and synovium each contribute to disease?
• What are the broad, non-prescriptive directions of osteoarthritis management?

Key concepts

• Articular cartilage degradation
• Subchondral bone remodeling
• Osteophyte formation
• Whole-joint disease concept
• Joint pain and stiffness
• Mechanical load and obesity
• Functional limitation

Mechanisms

Osteoarthritis is increasingly understood as a disease of the whole joint rather than passive cartilage wear: progressive breakdown of articular cartilage occurs alongside subchondral bone remodeling, osteophyte (bone spur) formation, synovial inflammation, and changes in ligaments and periarticular muscle (Hunter & Bierma-Zeinstra, 2019; Glyn-Jones et al., 2015). Mechanical load, joint injury, ageing, genetics, and obesity interact to drive an imbalance between tissue damage and repair. The resulting pain and stiffness reduce activity, which can in turn weaken supporting muscle and perpetuate the cycle.

Clinical relevance

Osteoarthritis is a major cause of chronic pain and disability in older adults and a common reason for joint replacement surgery, so nursing care frequently involves supporting self-management, mobility, and recovery after arthroplasty. This entry describes how the disease is understood and broadly managed for educational purposes and is not a substitute for clinical assessment or individualized care.

Epidemiology

Osteoarthritis is the most prevalent joint disease worldwide and a leading contributor to disability in ageing populations, with the knee, hip, and hand the most commonly affected sites; prevalence rises with age and is strongly associated with obesity and prior joint injury (Hunter & Bierma-Zeinstra, 2019; Glyn-Jones et al., 2015).

Evidence & guidelines

Major guidelines, such as the American College of Rheumatology/Arthritis Foundation recommendations for hand, hip, and knee osteoarthritis, emphasize core non-pharmacological measures including physical activity, exercise, and weight management alongside selected pharmacological options (Kolasinski et al., 2020). The detailed choice and balance of interventions is individualized and beyond the scope of this reference entry.

History

Long viewed simply as age-related cartilage wear, osteoarthritis has been reframed over recent decades as an active disease of the entire joint involving bone, synovium, and cartilage together, shifting management emphasis toward exercise, weight control, and joint preservation as well as surgical replacement for advanced disease.

Debates

Is osteoarthritis a single disease or a group of phenotypes?

Researchers increasingly describe distinct osteoarthritis phenotypes (for example post-traumatic, metabolic, or age-related), raising the question of whether management should be stratified rather than uniform; the clinical implications are still being defined.

Seminal works

• hunter-2019
• glynjones-2015
• kolasinski-2020

Frequently asked questions

Is osteoarthritis just wear and tear?

Current understanding treats osteoarthritis as an active disease of the whole joint, involving cartilage, bone, and synovium together, rather than simple mechanical wear, although mechanical load and injury are important contributors.

What non-drug measures are central to osteoarthritis care?

Guidelines consistently emphasize physical activity and exercise and, where relevant, weight management as core measures, complemented by other interventions chosen individually with the care team.