Mnemonic: NISA 10-50-90-100 Type I – Non-displaced Neck fracture (upto 10% risk of AVN) 1 blood vessel damaged (entering talar neck) Management: 8 weeks in cast and 4 weeks in CAM cast Type II – Type I + Inferior (subtalar) subluxation/dislocation (upto 50% risk of AVN) 2 blood vessels damaged…