Proximo-distal levels used to describe deep digital flexor tendon lesion location at magnetic resonance (MR) imaging (1, suprasesamoidean; 2, sesamoidean; 3, infrasesamoidean) and at ultrasonography (a, pastern; b, suprasesamoidean; c; distal sesamoidean and infrasesamoidean explored together with transcuneal approach). Region a (pastern) was not imaged using MR in this study.