Osteoarthritis is a widespread condition that often flies under the radar despite affecting millions, especially older adults throughout the UK. It occurs when the smooth cartilage that cushions bones in our joints gradually wears away, leading to pain, stiffness, and difficulty moving. This long-term joint disorder most commonly targets weight-bearing joints like the knees and hips, as well as the small joints of the fingers. With our population ageing, osteoarthritis is becoming an increasing concern for health and wellbeing. This article aims to clear up the confusion by breaking down its progression through different stages, explaining how it differs from rheumatoid arthritis, and sharing practical steps to slow its development and ease symptoms.

What is Osteoarthritis? Core Causes and Symptoms

Osteoarthritis happens when the cartilage—a smooth, flexible tissue allowing bones to glide easily inside joints—starts to break down. As cartilage wears away, bones can rub against one another, causing discomfort, swelling, and stiffness. Yue and Berman (2022) explain that “changes occur in both the cartilage and bone of joints that lead to joint pain, stiffness and swelling.” Recent studies also highlight a deeper cause behind this: “Mitochondria play an important role in some events involved in the pathogenesis of OA, such as energy production, the generation of reactive oxygen and nitrogen species, apoptosis, autophagy, senescence and inflammation” (Fernández-Moreno et al., 2021). Typical symptoms are tenderness, reduced joint movement, and sometimes a crunchy or grating sensation during motion. The knees, hips, and small finger joints are the most commonly affected areas. Specifically, “Knee osteoarthritis is a common type of arthritis that affects the knee joint, causing pain, swelling, and stiffness” (Voelker, 2024). Risk factors include ageing, family history, previous joint injuries, obesity, and repetitive use. Yue and Berman (2022) also point out that, “Risk factors for OA include being overweight, joint injury, muscle weakness, having other forms of arthritis, and heredity.” Doctors often use a combination of physical examinations and imaging such as X-rays, which typically show joint space narrowing and bone spur formation, to diagnose osteoarthritis.

The Four Stages of Osteoarthritis

Osteoarthritis doesn’t appear overnight—it develops gradually through four stages, each with its own set of changes and symptoms. Stage one usually involves minor cartilage damage with little or no pain. Stage two sees more noticeable wear, with occasional pain and stiffness. By stage three, there’s moderate cartilage loss alongside increased pain, swelling, and stiff joints—commonly in the hip or knee. Diagnosis typically involves a physical exam backed by imaging, as “Doctors may diagnose knee osteoarthritis based on a patient’s symptoms and a physical examination, sometimes supported by X-rays” (Voelker, 2024). Stage four is the most severe, with cartilage almost gone, causing bone to rub against bone. This leads to chronic pain, swelling, and a significant loss of joint function. Understanding these stages, especially what’s happening in the hip or knee joints at each point, helps guide treatment and management.

Osteoarthritis vs Rheumatoid Arthritis: Key Differences

It’s easy to mix up osteoarthritis with rheumatoid arthritis, but they’re quite different. Osteoarthritis results mainly from “wear and tear” of the cartilage over time. Rheumatoid arthritis, on the other hand, is an autoimmune condition where the immune system wrongly attacks the lining of the joints, causing inflammation. Osteoarthritis tends to affect joints unevenly—often targeting knees, hips and finger joints—while rheumatoid arthritis usually affects smaller joints symmetrically, such as in both hands and wrists. Rheumatoid arthritis typically comes with more visible inflammation like redness and swelling, plus symptoms such as fatigue. Osteoarthritis’s hallmark signs tend to be pain and stiffness without widespread inflammation. Because rheumatoid arthritis progresses rapidly and affects the whole body, it is often seen as the more severe condition. In short, osteoarthritis is about cartilage breakdown linked to age and injury, while rheumatoid arthritis involves chronic inflammation of the joint lining.

How to Slow Osteoarthritis: Prevention, Diet, and Lifestyle Strategies

Although there’s no cure for osteoarthritis, you can take effective steps to slow its progress and ease symptoms. Losing excess weight is especially helpful because it reduces pressure on joints like the knees and hips. Low-impact exercises such as swimming, cycling or walking strengthen muscles around the joints without causing further damage. Avoiding strenuous or high-impact activities that could aggravate pain is key. Diet also matters—a well-balanced intake rich in anti-inflammatory foods like oily fish, leafy greens and colourful fruits supports joint health. Some UK-based people turn to supplements like glucosamine and chondroitin, which may aid cartilage repair, though research is still ongoing. As Fernández-Moreno et al. (2021) highlight, “mitochondrial dysfunction together with mtDNA damage could contribute to cartilage degradation via several processes.” Anecdotal experiences suggest combining diet, gentle exercise, and natural remedies can improve symptoms. Choosing exercises that help, rather than worsen, knee and hip osteoarthritis is especially important.

Latest Non-Surgical Interventions and Self-Management for Advanced Osteoarthritis

For those with advanced osteoarthritis (particularly stage four in the knee or hip), surgery might seem like the only option—but it's not always necessary right away. Non-surgical treatments can relieve pain and improve mobility. These include physiotherapy, painkiller medications, and newer options like platelet-rich plasma injections or hyaluronic acid to cushion the joint. Managing diet remains important, alongside pain relief techniques such as acupuncture or gentle movement therapies like yoga and tai chi. Accessing support networks and educational resources can boost self-management confidence. As Yue and Berman (2022) reassure, “Osteoarthritis can be a serious condition, but it is treatable – most people do get better with treatment.” While these approaches won’t restore damaged cartilage, they can greatly enhance quality of life. Many have successfully managed advanced osteoarthritis by combining therapies suited to their needs, particularly for hip osteoarthritis. Voelker (2024) adds, “Treatments for knee osteoarthritis often include exercise, physical therapy, weight loss, pain relief medications, and sometimes injections.”

Conclusion

Grasping what osteoarthritis truly means—from its causes and symptoms to how it differs from rheumatoid arthritis—helps in managing the condition effectively. While it can cause pain and limit movement, early diagnosis and a combined approach of lifestyle, diet and medical care can slow the disease and improve daily life. If knee pain, stiffness or swelling linger, “See a doctor if you have pain, stiffness, or swelling in your knee that doesn’t go away” (Voelker, 2024). Armed with knowledge and proactive care, people living with osteoarthritis can take clear, practical steps towards better joint health and wellbeing.

References

• Yue, L., & Berman, J. (2022). What Is Osteoarthritis? JAMA, 327(19), e1980. https://doi.org/10.1001/jama.2022.1980
• Fernández-Moreno, M., Rego-Pérez, I., & Blanco, F. (2021). Is osteoarthritis a mitochondrial disease? What is the evidence. Current Opinion in Rheumatology, 33(1), 93–101. https://doi.org/10.1097/BOR.0000000000000855
• Voelker, R. A. (2024). What Is Knee Osteoarthritis? JAMA, 331(14), 1430. https://doi.org/10.1001/jama.2024.17482