This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arthritis, Subject name: Orthopaedics
Which can cause loose body in the joint - 
Select and explain. 
A. RA, B. Ankylosing spondylitis, C. OA, D. SLE
C: OA
Answer: C: OA 
Explanation: Ans. is 'c' i.e., OA o Causes of loose bodies includei) Osteoarthritisiii) Osteochondral fracture (injury) v) Synovial chondromatosisii) Osteochondritis dessicansiv) Charcot's disease o Among these, osteochondral fracture causes single loose bodies, while all other can cause multiple loose bodies, maximum by synovial chondromatosis (up to hundrades).