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Rheumatism (Osteoarthritis) – A Comprehensive Medical Guide

Overview

Osteoarthritis (OA), historically referred to as “rheumatism,” is the most common form of arthritis. It is a degenerative joint disease characterized by the breakdown of cartilage—the smooth, rubbery tissue that covers the ends of bones in a joint. As cartilage wears away, bones begin to rub against each other, causing pain, swelling, and loss of motion.

Who it affects: OA can affect anyone, but it most frequently appears in adults over 45. Women are more likely than men to develop knee OA after age 50, whereas men are slightly more prone to hip OA in early adulthood.<sup>[1]</sup>

Prevalence: According to the World Health Organization (WHO), more than 300 million people worldwide live with osteoarthritis. In the United States, the CDC estimates that about 32.5 million adults—roughly 14% of the adult population—have been diagnosed with OA.<sup>[2]</sup>

Symptoms

Symptoms develop gradually and may vary depending on which joint(s) are involved. Common sites include the knees, hips, hands, and spine.

• Joint pain: Typically worsens with activity and improves with rest.
• Stiffness: Most noticeable after periods of inactivity (e.g., first thing in the morning or after sitting).
• Reduced range of motion: Difficulty fully extending or bending the joint.
• Crepitus: A grinding, crackling, or popping sensation when moving the joint.
• Swelling: Often due to excess joint fluid (effusion) or bony growths (osteophytes).
• Joint deformity: Over time, bony enlargements can change the shape of fingers (Heberden’s nodes) or toes (Bouchard’s nodes).
• Muscle weakness: Disuse or pain may lead to atrophy of the surrounding muscles.
• Joint locking: In severe cases, a piece of cartilage can flap, causing the joint to temporarily “lock.”

Causes and Risk Factors

Primary (Idiopathic) Osteoarthritis

In most individuals, OA results from a combination of mechanical stress and biological changes that occur with aging. The cartilage matrix gradually loses water and proteoglycans, making it less resilient.

Secondary Osteoarthritis

OA can also develop secondary to another condition, such as:

• Joint injury or fracture
• Repeated overuse (e.g., athletes, manual laborers)
• Congenital or developmental joint abnormalities
• Inflammatory arthritis (e.g., rheumatoid arthritis)

Major Risk Factors

• Age: Risk climbs sharply after 45.
• Sex: Women are at higher risk, especially post‑menopause.
• Obesity: Each extra 5 kg (11 lb) can increase knee OA risk by 30%.<sup>[3]</sup>
• Genetics: Family history raises susceptibility; several genes linked to cartilage metabolism have been identified.
• Joint malalignment: Bow‑legged or knock‑kneed alignment places uneven stress on joint surfaces.
• Occupational factors: Jobs requiring kneeling, squatting, or heavy lifting.
• Previous joint infection or surgery.

Diagnosis

Diagnosing osteoarthritis is a clinical process that blends patient history, physical examination, and imaging or laboratory studies when needed.

Clinical Evaluation

• Detailed symptom review (onset, location, aggravating/relieving factors).
• Physical exam: tenderness, crepitus, range of motion, swelling, and alignment.

Imaging

• Plain radiographs (X‑ray): First‑line test; looks for joint space narrowing, osteophytes, subchondral sclerosis, and cysts.
• MRI: Provides a detailed view of cartilage, menisci, and soft tissues; used when diagnosis is uncertain or before surgical planning.
• Ultrasound: Helpful for detecting effusions and guiding joint‑space injections.

Laboratory Tests

Lab work is not diagnostic for OA but is useful to rule out other arthritis types.

• Complete blood count (CBC) and inflammatory markers (ESR, CRP) – usually normal in OA.
• Joint aspiration (arthrocentesis) – fluid analysis can exclude gout, septic arthritis, or rheumatoid arthritis.

Treatment Options

Treatment is individualized and often begins with non‑pharmacologic measures, progressing to medications, injections, or surgery as needed.

Non‑Pharmacologic Strategies

• Weight management: Losing 5–10% body weight can reduce knee pain by up to 50%<sup>[4]</sup>.
• Physical therapy (PT): Strengthening the quadriceps, hamstrings, and hip abductors improves joint stability.
• Low‑impact aerobic exercise: Walking, cycling, swimming, or water aerobics for 150 min/week.
• Assistive devices: Cane, walker, or shoe inserts to off‑load stressed joints.
• Thermal therapy: Heat reduces muscle spasm; cold packs lessen acute swelling.

Medications

Medication Class	Typical Use	Key Considerations
Acetaminophen (Tylenol)	Mild‑to‑moderate pain	Maximum 3 g/day; monitor liver function.
Non‑steroidal anti‑inflammatory drugs (NSAIDs)	Pain + inflammation	GI bleeding risk; consider COX‑2 selective (celecoxib) for patients with ulcer history.
Topical NSAIDs (diclofenac gel)	Localized knee or hand OA	Fewer systemic side effects.
Intra‑articular corticosteroid injections	Acute flare‑ups	Limit to 3‑4 injections per year to avoid cartilage damage.
Hyaluronic acid (viscosupplementation)	Chronic knee OA when NSAIDs contraindicated	Evidence mixed; may provide short‑term relief.
Prescription opioids	Severe refractory pain	Use lowest effective dose, short duration; high risk of dependence.

Surgical Options

• Arthroscopy: Limited role; may be used to remove loose bodies.
• Osteotomy: Realigns knee joint to off‑load damaged compartment (usually in younger, active patients).
• Joint replacement (arthroplasty): Total knee or hip replacement is definitive for end‑stage OA with severe pain and functional limitation. Success rates exceed 90% for pain relief and improved mobility.<sup>[5]</sup>

Living with Rheumatism (Osteoarthritis)

Managing OA is a lifelong process that blends medical care with daily lifestyle adjustments.

Daily Management Tips

• Stay active, but avoid over‑loading: Break up long periods of sitting; incorporate gentle stretching every hour.
• Joint‑protective techniques: Use the “large‑muscle‑group first” rule – power movements with hips and thighs rather than the knee alone.
• Smart footwear: Shoes with cushioned soles and good arch support reduce impact forces.
• Heat & cold therapy: Apply a warm pack for 15‑20 min before activity; use ice for 10‑15 min after activity if swelling occurs.
• Nutrition: Emphasize anti‑inflammatory foods—omega‑3 fatty acids (salmon, flaxseed), colorful fruits/vegetables, and whole grains. Limit processed foods high in saturated fats and sugars.
• Weight monitoring: Weigh yourself weekly; aim for a gradual 0.5–1 kg loss per week if overweight.
• Medication adherence: Keep a pill organizer; discuss any side effects with your provider promptly.
• Mental health: Chronic pain can lead to depression or anxiety; consider counseling, support groups, or mindfulness practices.

Prevention

While aging cannot be stopped, many modifiable factors can delay the onset or lessen the severity of OA.

• Maintain a healthy weight: Even modest weight loss dramatically reduces joint load.
• Engage in regular low‑impact exercise: Strengthens the musculature that supports joints.
• Protect joints during activity: Use proper technique, wear protective gear, and avoid repetitive high‑impact motions.
• Address joint injuries promptly: Early rehab after sprains or fractures prevents maladaptive mechanics.
• Screen for alignment issues: Orthotics or physical therapy can correct gait abnormalities that overload specific joints.

Complications

If left untreated or poorly managed, osteoarthritis can lead to several downstream problems:

• Persistent pain and disability: May limit ability to work, drive, or perform self‑care.
• Joint deformity: Advanced cartilage loss can cause visible bony enlargements and malalignment.
• Muscle atrophy: Disuse weakness increases fall risk.
• Secondary depression or anxiety: Chronic pain is a known risk factor for mood disorders.
• Increased risk of falls and fractures: Especially in older adults with knee or hip involvement.

When to Seek Emergency Care

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References

1. National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). “Osteoarthritis.” Accessed May 2026.
2. Centers for Disease Control and Prevention. “Arthritis Prevalence and Impact.” 2024.
3. J. Felson et al., “Obesity and Knee Osteoarthritis: A Systematic Review,” Annals of Rheumatic Diseases, 2022.
4. American College of Rheumatology (ACR) Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee, 2023.
5. American Academy of Orthopaedic Surgeons (AAOS). “Total Joint Replacement.” 2023.

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