This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Orthopaedics
Initial finding seen in knee TB 
Select and explain. 
A. Reduction of joint space, B. Increase in joint space, C. Degeneration of cailage, D. Bone resorption
B: Increase in joint space
Answer: B: Increase in joint space 
Explanation: Increase in joint space is initial finding seen in tuberculosis of knee joint. Triple knee deformity also occurs in knee TB. Triple knee deformity is flexion, external rotation, valgus at knee, associated with posterior subluxation of tibia.