1 MCQs in Orthopedics for NEET PG
A 32-year-old male presents with a 10-year history of inflammatory back pain, morning stiffness lasting 45 minutes, and progressive postural deformity. On examination, he demonstrates the classic "question-mark posture" with the thoracic spine component marked as **B** in the diagram showing significant hyperkyphosis. His HLA-B27 is positive, and sacroiliitis is confirmed on imaging. Which of the following best explains the pathophysiological mechanism underlying the thoracic hyperkyphosis (**B**) seen in this patient's ankylosing spondylitis?
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