This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
Unstable spine injury occurs in? 
Select and explain. 
A. Compression injury, B. Flexion-rotation injury, C. Extensor injury, D. Flexion injury
B: Flexion-rotation injury
Answer: B: Flexion-rotation injury 
Explanation: Mode of injuries in Lower Cervical Spine Fractures (C3 - C7)Mode of injuriesPattern of fractureVeical (Axial) compression Burst fracture (Veebral height is decreased in toto)Pure flexion Wedge compression fracture (Decreased anterior height of veebrae)Combined axial compression & flexion Tear drop fracture (Antero inferior fragment of veebral body is sheared off)Distraction - Flexion /Flexion rotation (MC unstable spine injury)Unilateral or bilateral subluxation & dislocation Flexion sprains Jumped facetsFloating veebra Avulsion injury of spinous process Clay shoveler's fracture Axial compression extension type Second most common type Distraction extension injury Disruption ofanterior ligamentous complex followed by posterior soft tissue complex (Refer: Rock wood and Green's Fractures in Adults, 7th edition, pg no: 1498,1413,1435,1485)