PRACTICAL CONSIDERATIONS FOR PRIMARY AND SECONDARY REPAIR IN FLEXOR TENDON INJURIES.
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This case report describes the medical follow-up of a 46-y-old (at the time of exposure) man who in 1971 accidentally exposed the fingers of his right hand to gamma-ray radiation from an iridium source that was used for nondestructive testing [estimated radiation dose: 26 Gy to 90 Gy (2,600 rad to 9,000 rad)]. No prominent acute injury was detected except for leukocytopenia (800 mm(-3)) and thrombocytopenia (15,000 mm(-3)). Three years later, the first, second, and third fingers presented repeated infection and started to develop contracture. Twenty-two years after exposure, he underwent amputation of the first and second fingers, and a toe graft was done. Radiological examinations prior to and following the operation revealed atrophic change of the finger bones and arterial injuries. Angiographic findings coincided with the region and extent of radiation injury of the fingers, which indicates that arterial damage is involved in the development of this chronic disorder.
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The differential diagnosis of the rupture of flexor pollicis longus tendon and profundus tendon to index finger to the interosseus anterior nerve syndrome can be difficult and can lead to misinterpretation of the clinical impression. Two cases are reported to demonstrate this problem. In the first case a spontaneous rupture of flexor pollicis longus was found, when first an interosseus anterior nerve syndrome was suspected. In a second case surgical exploration of flexor pollicis longus tendon and profundus tendon to index finger was done on the assumption of a rupture, that revealed intact tendons. In a second operation neurolysis of the interosseus anterior nerve was carried out with full recovery of flexion of the thumb and index finger.
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We report the results of examination of patients before primary and secondary unilateral digital nerve repair. Two-point discrimination was uniformly recorded. The results show that significant overlap of adjacent digital nerves is common and this has important implications for interpretation of results after repair. Recommendations are made regarding the evaluation of outcome following surgery.
This paper describes a new and simple approach to the flexor tendon via strategically placed transverse incisions in the flexor tendon sheath.
Sixty-nine patients with mallet finger who failed to be cured by a period of splintage were offered either tenodermodesis or Kirschner wire fixation of the DIP joint. Eleven (16%) accepted the offer and eight of these were significantly improved. Of those patients declining surgery, 30 were available for review after a minimum period of six months; of these 13 (43%) had undergone a significant spontaneous improvement.
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Zone 2 flexor tendon repairs can require "venting" or partial resection of the A2 and/or A4 pulleys. We propose and biomechanically assess a technique used by the authors in which the A2 and A4 pulleys are divided and repaired using a V-Y plasty. Two groups of cadaveric fingers were used, one group for assessing the A2 pulley and the second for assessing the A4 pulley. Prepared fingers were mounted onto custom-made jigs, tested using a servohydraulic testing machine and assessed for load to failure. The loads obtained were 75 N (SD = 26 N) and 234 N (SD = 73 N) for the A4 and A2 pulleys, respectively. These loads are well in excess of those one would anticipate during a postoperative active mobilization protocol. Tendon pulley V-Y plasty creates a mechanically sound pulley and maintains sufficient cover of the underlying tendon. This technique provides access to perform a tendon repair and/or permits free tendon gliding post-repair, thus providing an attractive alternative to simply "venting", or resecting, an otherwise troublesome pulley.
In the first web space region, there are communications between the dorsal arteries which arise from the dorsal branch of the radial artery and the digital arteries of the thumb and the index finger. These allow a distally based flap to be raised in the first dorsal intermetacarpal area. This flap has been used in 15 cases of soft-tissue loss from the thumb and index finger. The donor sites were closed primarily in all but two patients. There were no complications, and the results show that this flap is useful for soft-tissue defects on the tip and the palmar and dorsal surfaces of the thumb. Moreover, it may be used as a "cross-finger" flap.
An unusual case of avulsion fracture of the insertion of the flexor digitorum profundus tendon is presented. In most such avulsion fractures a small amount of fractured bone may remain with the tendon. In this case almost the entire distal phalanx was avulsed, and vascular compromise of the digit then occurred. Prompt reduction restored vascularity.
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