Osteoarthritis (OA) is the most common form of arthritis, affecting millions of people worldwide. Often referred to as “wear-and-tear” arthritis, it is a chronic condition that results from the breakdown and eventual loss of cartilage in one or more joints. While it is more prevalent in older adults, it is not an inevitable part of ageing. OA can significantly impact a person’s quality of life, causing pain, stiffness, and reduced mobility that can make everyday activities challenging.

Understanding the nature of this disease, including its underlying causes, how it progresses, and the available treatment options, is the first step towards effective management. This article provides a comprehensive guide to OA, exploring the causes of osteoarthritis, recognising the key symptoms, outlining established treatment options, and addressing common questions about this pervasive condition.

What is Osteoarthritis? The Breakdown of Cartilage

To understand OA, one must first appreciate the role of cartilage. Cartilage is a firm, slippery tissue that covers the ends of bones in a joint. It provides a smooth surface that allows bones to glide past one another effortlessly as well as acts as a shock absorber. In OA, this protective cartilage gradually deteriorates over time. As the cartilage wears down, the smooth gliding surface becomes rough and pitted.

Eventually, the bones may rub directly against each other, leading to pain, friction, and inflammation. The body’s response to this damage is to produce bone spurs (osteophytes) around the joint, which can cause additional pain and stiffness. The joint capsule may also become inflamed, a condition known as synovitis.

Unlike some other forms of arthritis, such as rheumatoid arthritis, OA is primarily a mechanical process of joint degeneration rather than an autoimmune disease. While inflammation is present, it is a secondary reaction to the joint damage rather than the primary driver of the disease.

Osteoarthritis Causes: A Complex Mix of Factors

While OA is often associated with ageing, its causes are a complex mix of genetic, mechanical, and lifestyle factors. It is not simply the result of getting older.

• Age: The risk of developing OA increases with age. As we get older, our cartilage loses some of its water content and resilience, making it more susceptible to damage.
• Obesity: Excess body weight puts significant stress on weight-bearing joints, particularly the knees, hips, and spine. Every extra stone of weight can add a substantial load to the knee joint, accelerating cartilage breakdown. Weight loss is therefore one of the most effective ways to prevent and manage OA.
• Joint Injury: A history of joint injury, such as a sports injury, fracture, or surgical procedure, can significantly increase the risk of developing OA in that joint later in life, even years after the initial injury has healed.
• Repetitive Stress: Jobs or sports that involve repetitive stress on a particular joint, such as kneeling, squatting, or carrying heavy loads, can contribute to the development of OA.
• Genetics: OA has a hereditary component. If your parents or siblings have OA, you are more likely to develop it. Genetic factors can influence the quality of a person’s cartilage or the alignment of their joints.
• Anatomical Factors: Some people are born with joint deformities or misaligned bones that can increase their risk of developing OA.

What are the 4 Stages of Osteoarthritis?

OA progression is often categorised into four stages, based on the severity of cartilage damage and bone spur formation as seen on an X-ray.

Osteoarthritis Symptoms: Recognising the Signs

Recognising the symptoms of osteoarthritis is key to early diagnosis and management. The signs often develop gradually over time and can vary in severity from person to person.

• Pain: The most common symptom. It often worsens with activity and improves with rest. It can be a deep ache or a sharp, stabbing pain.
• Stiffness: A feeling of joint stiffness, particularly in the morning or after periods of rest. This “morning stiffness” is usually brief, lasting less than 30 minutes, which helps distinguish it from the longer stiffness of inflammatory arthritis.
• Swelling: The joint may become swollen and tender due to inflammation.
• Grating or Cracking Sensation: A crunching or grating sound (crepitus) may be heard or felt when the joint is moved, caused by the rough cartilage surfaces rubbing together.
• Reduced Range of Motion: The ability to move the joint fully may decrease over time.
• Weakness: Muscles around the joint may weaken due to pain and reduced use.

For conditions like osteoarthritis in the knee, symptoms can make it difficult to walk, climb stairs, or get up from a seated position.

Diagnosis of Osteoarthritis

A correct diagnosis of osteoarthritis is typically made through a combination of a physical examination, a review of symptoms, and imaging tests.

Physical Examination: A doctor will examine the affected joint for tenderness, swelling, redness, and flexibility.

Medical History: The doctor will ask about your symptoms, past injuries, and family history to help identify risk factors.

Imaging Tests:

• X-rays: These are the most common diagnostic tool. While X-rays cannot show cartilage directly, they can reveal a narrowing of the joint space (indicating cartilage loss) and the presence of bone spurs, which are key signs of OA.
• MRI: An MRI provides a more detailed image of the soft tissues, including cartilage, tendons, and ligaments. While not usually needed for a standard OA diagnosis, it can be helpful in more complex cases or to rule out other conditions.

Blood Tests: Blood tests are not used to diagnose OA, as it is not an autoimmune disease. However, they may be used to rule out other types of arthritis, such as rheumatoid arthritis, which is important for determining the correct treatment plan.

Treatment of Osteoarthritis: A Multifaceted Approach

The primary goal of osteoarthritis treatment is to manage pain, improve joint function, and slow the progression of the disease. While there is no cure for OA, a range of therapies and lifestyle modifications can be highly effective.

Non-Surgical Treatments

Non-surgical treatments may include:

Weight Management

Losing even a small amount of weight can significantly reduce stress on weight-bearing joints and ease pain. This is arguably the most impactful lifestyle change for OA, particularly in the knees and hips.

Physical Activity and Exercise

It might seem counterintuitive, but exercise is crucial. Low-impact aerobic activities like swimming, cycling, or walking keep the joints moving and flexible. Strengthening exercises for the muscles around the joint provide better support and stability. A physiotherapist can design a safe and effective exercise programme.

Medication

• Over-the-Counter Pain Relievers: Acetaminophen (paracetamol) and nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen can help manage pain and inflammation.
• Prescription Medications: Stronger NSAIDs or other pain relievers may be prescribed.
• Topical Treatments: Creams, gels, or patches containing NSAIDs or capsaicin can provide localised pain relief.

Assistive Devices

Using a cane, walker, or knee brace can reduce stress on the joint and improve stability.

Injections

• Corticosteroid Injections: Injecting a powerful anti-inflammatory steroid directly into the joint can provide temporary but rapid pain relief, lasting from a few weeks to several months.
• Hyaluronic Acid Injections: Also known as “viscosupplementation,” these injections of a gel-like substance can help lubricate the joint and reduce pain.

Surgical Treatments

When non-surgical options are no longer effective and the pain significantly interferes with a person’s quality of life, surgery may be considered.

• Joint Preservation Surgery: These procedures, such as osteotomy, aim to realign bones to shift weight away from the damaged part of the joint.
• Joint Replacement Surgery (Arthroplasty): This is a highly effective procedure, particularly for severe OA of the hip or osteoarthritis knee. The damaged joint is removed and replaced with an artificial one made of metal, plastic, or ceramic. This can provide dramatic pain relief and restore function.

The Bottom Line

Osteoarthritis is a chronic and progressive condition, but it is not a diagnosis without hope. By understanding the causes and recognising the symptoms at an early stage, individuals can take proactive steps to manage the disease. While there is no cure, a multi-faceted approach to osteoarthritis treatment can be incredibly effective in controlling pain, improving mobility, and maintaining an active lifestyle. Whether it’s through simple lifestyle changes like weight loss and exercise or more advanced medical interventions like injections and surgery, a personalised treatment plan is the key to living well with OA. The journey to a healthier, more active life with OA begins with knowledge and a commitment to positive change. By embracing a proactive approach, individuals can regain control over their joint health and continue to enjoy a fulfilling and mobile future.

Sources:

• https://www.verywellhealth.com/osteoarthritis-7108564
• https://my.clevelandclinic.org/health/diseases/5599-osteoarthritis
• https://www.mayoclinic.org/diseases-conditions/osteoarthritis/symptoms-causes
• https://www.verywellhealth.com/osteoarthritis
• https://versusarthritis.org/about-arthritis/conditions/ostearthritis/
• https://www.arthritis.org/diseases/osteoarthritis