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Do the dimensions of the distal phalanges allow suture anchor fixation of the flexor digitorum profundus? A cadaver study

This study was done to identify whether the dimensions of the distal phalanges allow suture anchor fixation of the flexor digitorum profundus tendon. Forty pairs of hands were dissected to measure the anteroposterior and lateral dimensions of distal phalanges of all digits. The mean anteroposterior depth of the distal phalanx at the insertion of the tendon was found to be 4.7 mm for the little finger, 5.4 mm for the ring finger, 5.9 mm for the middle finger, 5.4 mm for the index finger and 6.9 mm for the thumb respectively. The commonly available anchors and drill bits for fingers were found to be suboptimal for anchoring the flexor digitorum profundus tendon to the distal phalanx of the little finger. The drill bits used for these anchors were found to be too long for the little fingers and some ring and index fingers.