This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic Disorders Leading to Osteosclerosis, Subject name: Orthopaedics
Windswept deformity of the knee is seen in - 
Select and explain. 
A. Osteoarthritis, B. Rheumatoid arthritis, C. Ankylosing Spondylitis, D. Psoriatic arthritis
B: Rheumatoid arthritis
Answer: B: Rheumatoid arthritis 
Explanation: Ans. is 'b' i.e., Rheumatoid arthritis Windswept deformity1. Knee:- A valgus deformity of one knee in association of varus deformity of other knee is know as windswept deformity. It is seen in: Rickets, Physeal oseochondromatosis, Hereditary dysplasia (epiphyseal dysplasia) of bone and Rheumatoid arthritis.2. Foot:- Deviation of all - toes in one direction (usually laterally) is known as windswept deformity. It is seen in Rheumatoid arthritis.3. Hand:- Deviation of all fingers (usually medialy) is know as windswept deformity. It is seen in Rheumatoid arthritis, SLE, and Jacoud's arthropathy.