A
Avulsion fracture of the base of the 5th metatarsal tuberosity
B
Metaphyseal-diaphyseal junction of the 5th metatarsal
C
Proximal diaphyseal fracture of the 5th metatarsal (stress fracture)
D
Neck of the 5th metatarsal
Explanation:The correct option is 'b'. A true Jones fracture occurs at the metaphyseal-diaphyseal junction of the fifth metatarsal, extending into the 4th-5th intermetatarsal articulation. It is distinguished from Zone 1 tuberosity avulsion fractures (pseudo-Jones) and Zone 3 proximal diaphyseal stress fractures. Zone 2 (Jones) has a higher risk of nonunion due to a vascular watershed area.
Reference: Lawrence SJ, Botte MJ. Jones' fractures and related fractures of the proximal fifth metatarsal. Foot Ankle. 1993;14(6):358-365.