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Diagram of the location of the most common accessory bones around the ankle and hindfoot. a Lateral and (b) AP projection of the ankle and hindfoot: 1—os trigonum, 2—os sustentaculi, 3—os calcaneus secundarius, 4—os subtibiale, 5—os subfibulare, 6—os supratalare, 7—os talotibiale, 8—talus secundarius
