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Sideswipe Injury.
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Old 08-26-2024, 11:23 PM
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A 18-year-old man presented to us following a sideswipe injury leading to crush avulsion amputation of the right upper limb at the level of the upper 1/3 of the humerus shaft. The injury occurred 7 hours earlier, and he was haemodynamically stable at the time of presentation. On examination of the amputated distal stump, we noticed multisegmental both bone open fractures and extensive crush injury of the forearm muscles. The skin over the proximal stump was gangrenous; the arm muscles were crushed and contaminated (figure 1). Because of the severity of the injury and late presentation, replantation of the upper limb was deferred, and free fillet flap was planned. Though the ischaemia time in our patient was 7 hours, we believe that a skin flap from the amputated limb can be used if the maximal duration of ischaemia is up to 12 hours in an unpreserved and up to 24 hours in a well-preserved amputated part.

Meanwhile, we had covered the amputated part with moist gauze and placed it in a plastic bag. This bag was put in another plastic bag filled with ice and water. In this manner, the amputated part was preserved and taken to the operation theatre. The part was scrubbed with diluted 4% chlorhexidine gluconate solution and rinsed with copious amount of normal saline to clear the debris. The remaining debris was removed surgically under loupe magnification. In our practice, we do not flush the vessels with iced Ringers solution, heparinised saline solution or any special solution.

A conjoined radial and ulnar artery forearm flap was harvested from the amputated forearm as we had a suspicion either of them would have been damaged in the crush injury. Both radial and ulnar vessels were uninjured. The gangrenous skin and contaminated arm muscles were debrided, and brachial artery, basilic vein and cephalic vein were tagged for anastomosis. Ulnar vessels were ligated and divided at their origin; ulnar portion of the conjoined flap was discarded. The free forearm fillet flap was based on the brachial artery in continuity with the radial artery, cephalic vein and basilic vein. An end-to-end anastomosis was performed between the two ends of brachial artery with 8–0 prolene sutures. Similarly, the basilic vein and cephalic vein were anastomosed (figure 2). Postoperatively, enoxaparin sodium (1 mg/kg/day) was used as an anticoagulant for 5 days. The patient had an uneventful recovery with stable soft tissue cover over the arm stump (figure 3). We referred him for a prosthesis.

Fillet flap is a type of axial pattern flap that can be used as a pedicle flap and free flap.1 This belongs to the concept of ‘spare parts’ in which the tissues are harvested from the non-salvageable amputated parts to be used at the site of the proximal stump. Fillet flaps are traditionally used to resurface large traumatic and oncological soft tissue defects.2 In either scenario, a large amount of tissue can be harvested from the non-salvageable portion to cover the soft tissue defects. By this procedure, donor site morbidity of other regions can be avoided. In our patients, there was skin and soft tissue deficit following the debridement of the arm stump. Primary closure of the wound would result in undue shortening of the stump. Skin grafting is an alternate option, but it would result in a suboptimal soft tissue cover. In this way, a free fillet flap provided stable soft tissue cover and a more usable stump.
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Old 08-27-2024, 01:06 AM
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Old 08-27-2024, 02:56 PM
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