In skeletal tuberculosis of joints, Phemister's triad includes which combination of radiographic findings?
- A Bony sclerosis, sequestrum formation, involucrum
- B Periarticular osteoporosis, peripheral osseous erosion, gradual narrowing of joint space ✓
- C Periosteal reaction, lytic lesions, Codman's triangle
- D Subchondral cysts, osteophytes, loose bodies
Correct answer: B. Periarticular osteoporosis, peripheral osseous erosion, gradual narrowing of joint space
Explanation
Phemister's triad in tubercular arthritis consists of periarticular osteoporosis (due to hyperemia), peripheral osseous erosion (bare area at synovial attachment), and gradual (relative preservation then) narrowing of joint space. This distinguishes TB arthritis from rheumatoid arthritis. Option A describes chronic pyogenic osteomyelitis features. Option C describes osteosarcoma features. Option D describes osteoarthritis.
Reference: Maheshwari J, Essential Orthopaedics, 6th ed.
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