For Patients & General Readers
Osteoarthritis is a common condition where the protective cartilage that cushions your joints wears down over time. It most often affects weight-bearing joints like knees and hips, as well as hands and spine, leading to pain, stiffness, and reduced mobility. While it's more common with age, it can significantly impact daily life and quality of life.
Clinical Overview
Osteoarthritis (OA) is a degenerative joint disease characterized by the breakdown of articular cartilage, leading to subchondral bone changes, synovial inflammation, and osteophyte formation. It is the most prevalent form of arthritis, primarily affecting weight-bearing joints and hands, and is associated with pain, stiffness, and functional limitation.
Clinical Presentation
- Insidious onset of joint pain, typically exacerbated by activity and relieved by rest.
- Morning stiffness lasting less than 30 minutes, improving with movement.
- Joint swelling, often mild and non-pitting, particularly after overuse.
- Crepitus (a grinding or popping sensation) with joint movement.
- Decreased range of motion and functional limitations.
- Bony enlargement, particularly in distal interphalangeal (DIP) and proximal interphalangeal (PIP) joints (Heberden's and Bouchard's nodes, respectively).
Signs & Symptoms
Symptoms (Patient-Reported)
- Joint pain that worsens with activity and improves with rest
- Stiffness, especially in the morning or after periods of inactivity
- A feeling of grating or clicking in the joint
- Tenderness when pressure is applied to the joint
- Loss of flexibility or reduced range of motion
- A feeling of bone rubbing against bone
Signs (Clinician-Observed)
- Joint crepitus on passive or active range of motion
- Bony enlargements (osteophytes) at joint margins
- Palpable joint effusion (less common, typically mild)
- Tenderness to palpation over the joint line
- Reduced range of motion
Differential Diagnoses
| Condition | Distinguishing Feature |
|---|
| Rheumatoid Arthritis (RA) | RA is typically symmetrical, involves small joints of hands and feet, often with morning stiffness > 1 hour, and systemic inflammatory symptoms; OA is usually asymmetrical and affects weight-bearing joints. |
| Gout/Pseudogout | Characterized by acute, severe, inflammatory flares with marked erythema and warmth; OA is chronic and degenerative with less acute inflammation. |
| Septic Arthritis | Acute onset of severe joint pain, swelling, erythema, warmth, and fever; requires urgent diagnosis and treatment to prevent joint destruction. |
| Avascular Necrosis (AVN) | Insidious onset of deep, boring pain, often in the hip, exacerbated by weight-bearing; risk factors include corticosteroid use, alcohol abuse, and trauma. |
| Fibromyalgia | Widespread musculoskeletal pain, fatigue, sleep disturbances, and cognitive difficulties; joint pain is diffuse and not typically associated with objective joint findings. |
| Bursitis/Tendonitis | Localized pain and tenderness over specific bursae or tendons, often exacerbated by specific movements; OA involves diffuse joint pain and cartilage degeneration. |
Red Flags — Seek Immediate Care
- Sudden onset of severe joint pain and swelling, especially with fever, suggestive of septic arthritis.
- Significant joint effusion with signs of inflammation (redness, warmth) and systemic symptoms, potentially indicating an inflammatory arthropathy or infection.
- Joint pain that is unremitting, wakes the patient from sleep, or is associated with unintentional weight loss, suggesting malignancy or other systemic disease.
- Suspected fracture or significant trauma leading to joint instability or deformity.
Key Investigations
- Plain radiography (X-rays): Standard initial imaging to assess joint space narrowing, osteophytes, subchondral sclerosis, and cysts.
- Laboratory tests: Erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) are typically normal in primary OA but can be elevated in inflammatory conditions or secondary OA.
- Joint aspiration: Indicated if infection or crystal arthropathy is suspected; synovial fluid analysis for cell count, crystal identification, and culture.
- Magnetic Resonance Imaging (MRI): May be used in select cases to assess soft tissues, cartilage integrity, meniscal tears, or bone marrow edema, particularly when X-rays are inconclusive or for surgical planning.
Management Overview
Management of osteoarthritis is multimodal and focuses on symptom relief, functional improvement, and slowing disease progression. It includes non-pharmacological interventions such as exercise, weight management, and physical therapy, alongside pharmacological options like analgesics (acetaminophen, NSAIDs) and intra-articular injections (corticosteroids, hyaluronic acid). Surgical interventions, such as arthroplasty, are reserved for severe, refractory cases.
Disclaimer: This article is for educational purposes only and does not constitute medical advice.
Always consult a qualified healthcare professional for diagnosis and treatment.
TruelyserMD does not replace clinical judgement.