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 Spine, Subject name: Orthopaedics
Pott's spine is commonest at which spine: 
Select and explain. 
A. Thoracolumbar, B. Sacral, C. Cervical, D. Lumbosacral
A: Thoracolumbar
Answer: A: Thoracolumbar 
Explanation: ANSWER: (A) ThoracolumbarREF: Apley 387-389, S M Tuli 3rd edition page 192Most common site of skeletal tuberculosis is spine followed by hip and knee SPINE (50%) > HIP > KNEECommonest spine involved in spine TB is Thoracolumbar/Dorsolumbar T12-L1 (Lower thoracic to be precise)LOWER THORACIC > LUMBAR > UPPER THORACICParaplegia due to pott s spine most commonly involves upper thoracic vertebrae as in upper thoracic vertebrae there is more acute kyphosis, spinal canal is narrow and spinal cord is relatively large.First symptom of TB spine is "Pain on movement"Commonest symptom of TB spine is "Back pain"