This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TB of the Hip, Knee, Other Joints, Subject name: Orthopaedics
Spina ventosa is: 
Select and explain. 
A. Tubercular dactylitis, B. TB of spine, C. TB of vertebral pedicles, D. Extra-axial
A: Tubercular dactylitis
Answer: A: Tubercular dactylitis 
Explanation: Ans (a) Tubercular dactylitisRef: Maheshwari 5th ed./203* Spina ventosa Cwind-filled sail") refers to the end- stage radiographic appearance of tuberculosis dactylitis. Cystic expansion of the short tubular bones with bone destruction.* Tuberculous dactylitis is the painless tuberculous involvement of the fingers and toes and is more common in children. It begins with fusiform soft-tissue swelling with or without periostitis.Also Know* MC site bone TB: Spine > Hip > Knee* MC site in spine is Thoracolumbar (paradiscal)* Earliest symptom: BACK PAIN* Triad of TB joint: Decreased joint space + articular damage + Juxta-articular osteoporosis* Spina ventosa- TB of short bones* Caries sicca: TB shoulder* Poncet disease: TB associated with polyarthritis.