Osteoarthritis
Background
Risk Factors
- Age
- Female versus male sex
- Obesity
- Lack of osteoporosis
- Occupation
- Previous injury
- Muscle weakness
- Genetic elements
Clinical Features
- Commonly affected joints
- Cervical and lumbar spine
- First carpometacarpal joint
- Proximal interphalangeal joint
- Distal interphalangeal joint
- Hip
- Knee
- Subtalar joint
- First metatarsophalangeal joint
- Uncommonly affected joints
- Shoulder
- Wrist
- Elbow
- Metacarpophalangeal joint
Differential Diagnosis
Monoarticular arthritis
- Acute osteoarthritis
- Avascular necrosis
- Crystal-induced (Gout, Pseudogout)
- Gonococcal arthritis, arthritis-dermatitis syndrome
- Nongonococcal septic arthritis
- Lyme disease
- Malignancy (metastases, osteochondroma, osteoid osteoma)
- Reactive poststreptococcal arthritis
- Trauma-induced arthritis
- Fracture
- Ligamentous injury
- Overuse
- Avascular necrosis
- Decompression sickness
- Spontaneous osteonecrosis
- Hemorrhagic (e.g. hemophilia, systemic anticoagulation
- Seronegative spondyloarthropathies (ankylosing spondylitis, IBD, psoriatic arthritis, reactive arthritis
- RA, SLE
- Sarcoidosis, amyloidosis
- Periarticular pathology
- Transient (Toxic) Synovitis (Hip)
- Slipped Capital Femoral Epiphysis (SCFE)
- Legg Calve Perthes Disease
Polyarthritis
- Fibromyalgia
- Juvenile idiopathic arthritis
- Lyme disease
- Osteoarthritis
- Psoriatic arthritis
- Reactive poststreptococcal arthritis
- Rheumatoid arthritis
- Rheumatic fever
- Serum sickness
- Systemic lupus erythematosus
- Serum sickness–like reactions
- Viral arthritis
Diagnosis
- Greater than 50 years of age
- Morning stiffness for less than 30 minutes
- Crepitus on active motion of the knee
- Bony tenderness
- Bony enlargement
- No palpable warmth