Massive hand crush: the role of a free muscle flap to obliterate the dead space and to clear deep infection.

Death of tissue and/or deep infection leading to amputation is not an uncommon course of events after massive crush injuries of the central part of the hand. Management of this injury faces the dual problem of having to carry out debridement in the central part of the hand which is radical enough to remove all dead tissue but which, in itself, creates a huge dead space in the depths of the wound. Inadequate debridement and/or leaving a dead space which fills with fluid and detritus behind the flexor tendons leads on to infection, devascularisation of the fingers and amputation. This paper presents the results of very radical debridement of the hand dorsal to the flexor tendons, including the intermetacarpal spaces, and filling the dead space with a well-vascularised free muscle flap in two hands which were referred in a pre-amputation stage, with one already being infected. Both hands were salvaged.

Treatment of nonunion of the scaphoid by a limited combined approach.

Seven patients with nonunion of the scaphoid were treated by a limited approach combining a palmar wedge graft with insertion of a dorsal (retrograde) Herbert screw through small incisions. All patients had palmar bone deficiency and a 'difficult' proximal fragment. They were followed up for a minimum of 12 months (12 to 38). Radiological union was achieved in all. In five patients correction of instability of the dorsal intercalary segment which was present before operation, was achieved. On a wrist-scoring chart, all patients had an excellent or good rating. The limited combined approach allows correction of the deformity with rigid fixation and has the advantage of preserving most of the palmar ligaments.

Extensor digitorum brevis free flap: anatomic study and further clinical applications.

The extensor digitorum brevis muscle flap is reliable, safe, and can be used either as a pedicle or as a free flap with minimal donor site morbidity. To increase the existing knowledge of this flap and to establish further anatomic basis for the design and elevation of the extensor digitorum brevis flap, 26 specimens from 13 fresh cadavers were dissected under 3.5x loupes. The lateral tarsal artery was found to be the main blood supply to the muscle. It has an average diameter of 1.83+/-0.35 mm and a length of 1.89+/-0.69 cm. The dorsalis pedis artery has, at the level of the lateral tarsal artery takeoff, a diameter of 3.25+/-0.62 mm. From this point to the origin of the deep plantar branch, the dorsalis pedis artery has minimal branching, and the surgeon has available an artery homogeneous in diameter that is 6.77+/-0.99 cm in length. Related neurovascular structures (anterior tibial artery and the venae comitantes, dorsalis pedis and first dorsal metatarsal artery, and deep peroneal nerve) were also studied. A safe and reliable harvesting technique and the "T interposed extensor digitorum brevis" technique for sparing the anterior tibial artery are presented, as are clinical case examples on the use of this flap as a flow-through, extensor digitorum brevis-vascularized nerve graft, a combined extensor digitorum brevis-deep peroneal nerve graft, and a bilobed extensor digitorum brevis-dorsalis pedis fasciosubcutaneous free flap.

The indications for toe transfer after "minor" finger injuries.

Toe-to-hand transfer is widely considered to be unjustified for "minor" finger injuries. In this invited personal view article the indications for toe-to-hand transfer for finger amputation and neurocutaneous and major pulp defects are discussed, and a classification of multidigital injury that has both prognostic and decision-making value is presented. In the author's opinion a toe transfer should always be considered as an option when reconstructing "minor" finger injuries, as it can reproduce significant long-term benefit to the hand and the patient's sense of well being. The procedure should be carried out in the acute period, not only because it is technically easier and better for hand function, but above all because the surgeon can save structures that will be lost if the transfer is delayed.

(Dry) arthroscopic partial wrist arthrodesis: tips and tricks.

One of the options for performing a partial wrist arthrodesis is the arthroscopic technique. As a first advantage arthroscopy allows us to directly assess the state of the articular surface of the carpal bones and define the best surgical option during the salvage operation. Furthermore, it allows performance of the procedure with minimal ligament damage and minimal interference with the blood supply of the carpals. These will (presumably) entail less capsular scarring and more rapid healing. Lastly, there is cosmetic benefit by reducing the amount of external scarring. The procedure has a steep learning curve even for accomplished arthroscopists but can be performed in a competitive manner to the open procedure if the dry technique is used. The aim of this paper is to present the technical details, tricks and tips to make the procedure accessible to all hand specialists with an arthroscopic interest. As it is paramount that the surgeon is acquainted with the "dry" technique, some technical details about it will also be presented.

A technique for arthroscopic all-inside suturing in the wrist.

A technique for arthroscopic all-inside suturing in the wrist is presented. The procedure allows placement of the knot inside the joint without additional incisions. We have applied it in cases of dorsal, foveal and coronal tears of the triangular fibrocartilage. No special instrument is required apart from a Tuohy needle.

Sagittal rotational malunions of the distal radius: the role of pure derotational osteotomy.

Sagittal rotational malunion after distal radius fractures was identified in eight patients by the presence of a "hinge" point on the volar cortex on the lateral radiograph, and the ulnar head being shorter than the anterior lip of the radius on the posterior-anterior radiograph. The surgical correction consisted of preplating the distal fragment with a volar locking plate before an osteotomy through the "hinge" point, and correcting the dorsal tilt of the distal fragment. Any dorsal defect was filled with cancellous bone graft from the olecranon. Pain, range of motion and grip all improved. Disabilities of arm, shoulder and hand score changed from 54 to six. Dorsal sagittal tilt improved by 26 degrees , from -23 degrees to +3 degrees . Ulnar variance improved by 3 mm, from +1.5 to -1.5 mm, becoming identical to the opposite side. A pure derotational osteotomy corrected the apparent shortening of the radius and restored the volar tilt.

Vascularised corticoperiosteal grafts from the medial femoral condyle for difficult non-unions of the upper limb.

The vascularised corticoperiosteal graft was introduced by Sakai and Doi, in 1991, as a means to achieve bony union under unfavourable conditions. We present our experience with this vascularised graft, taken from the femoral condyle, in six patients with difficult non-unions (5) or other bony problems (1) in the upper limb. In five cases, a long bone defect--two humeral, two ulnar and one radial--was involved. All had had between three and seven previous operations. Two of the non-unions were secondary to infection. The others had had conventional grafting on two or three previous occasions each. In the sixth case, a corticoperiosteal graft was used to promote healing in a combined carpometacarpal and intercarpal dislocation with a very poor bed. All of the grafts survived without complications and all of the bones healed radiologically in less than three months. Three patients achieved a normal range of motion and two obtained a functional range of motion with only slight limitations. The carpometacarpal arthrodesis was healed soundly at five weeks.

The deep venous system and reverse flow flaps.

The deep venous system of the upper and lower extremities was injected with a lead oxide mixture in 2 fresh human cadavers, dissected, radiographed and the sites of the venous valves located. These studies confirmed that the macrovenous connections between the venae comitantes of the distributing arteries were insufficient in number to bypass the venous valves in conventional, distally based reverse flow flaps (e.g. radial, ulnar, peroneal) but revealed an alternative microvenous interconnecting pathway which surrounds the artery as the venae arteriosa. This pathway was investigated in a series of distally based reverse flow saphenous flaps in dogs, comparing flaps where the microvenous connections were left intact (non-skeletonised) with those where these vessels were disconnected with the operating microscope (skeletonised). All non-skeletonised flaps survived subtotally or totally whereas total necrosis was observed in 70% of the skeletonised flaps. Finally a series of haemodynamic studies was performed to test valve competency including extrinsic pressure on the valves. It is concluded that the macrovenous and microvenous pathways, coupled with the variable anatomy of the venous valves, are major factors in determining the survival of reverse flow flaps.

The venous drainage of nerves; anatomical study and clinical implications.

The venous drainage of the peripheral nerves was studied in the upper and lower limbs of two human fresh cadaver subjects after total body perfusion with a radio-opaque lead oxide mixture. Four patterns of extraneural drainage were identified in which the venae nervosa drained: directly to the venae comitantes of the neurovascular bundle; indirectly via nearby veins, derived usually from muscles; to the periarterial venous plexus; or, in the case of the cutaneous nerves, to the perivenous plexus. The various patterns of the drainage along the length of the radial, median, ulnar, sciatic, anterior and posterior tibial nerves were identified. A rich longitudinal plexus of veins exists on and within the nerve which appears to be mainly free of valves. The large venae nervosa usually contained valves, whereas the tiny veins draining the nerves were valveless or exhibited a sentinel valve at their entry point into a larger venous channel. The clinical implications of these results are discussed in relation to the mobilisation of nerves, the use of island nerve flaps, possible donor sites for free arteriolised neurovenous flaps and the compressive nerve syndromes.

A technique to preserve the shape of the calcaneus after massive osteomyelitis.

Osteomyelitis of the os calcis challenges the reconstructive surgeon. We present the case of a patient in which massive medullary osteomyelitis of the calcaneus was treated with a technique that preserves the bone shape. The medullary cavity of the bone was first emptied, preserving the cortical shell. Then a free muscle flap was used to fill up the dead space. Three months later autologous bone grafts were packed into the cavity. Full weight-bearing was commenced 4 months after this procedure. In the latest follow-up, 2 1/2 years, the patient has had no recurrence or difficulty with walking.

Total ulnar nerve transection during endoscopic carpal tunnel release.

We report the case of a patient who suffered a complete laceration of the ulnar nerve during an endoscopic carpal tunnel release following Chow's two-portal extrabursal method. The possible mechanism of injury is discussed.

Usefulness of gadolinium-enhanced MR imaging in the evaluation of the vascularity of scaphoid nonunions.

OBJECTIVE: The objective of this article is to identify the role of gadolinium-enhanced MR imaging in the preoperative evaluation of the vascular status of the proximal fragment in scaphoid nonunions. SUBJECTS AND METHODS: Thirty consecutive patients (27 men and three women; age range, 19-52 years; mean age, 28 years) with nonunion of the scaphoid were prospectively examined with unenhanced and gadolinium-enhanced MR imaging. MR images and surgical findings were classified in four groups according to the vascular status of the proximal fragment (normal bone, moderate ischemic bone, severe ischemic bone, and avascular necrosis). Sensitivity, specificity, and accuracy of unenhanced and gadolinium-enhanced MR studies were calculated. Surgical findings were used as the gold standard. The postoperative rate of union at 12 months was evaluated for each group. RESULTS: Unenhanced MR imaging showed a global sensitivity of 36%, specificity of 78%, and accuracy of 68% in the preoperative evaluation of the vascular status of the proximal fragment. Correlation with the surgical findings was not statistically significant (p < 0.149). Global sensitivity, specificity, and accuracy of gadolinium-enhanced MR imaging were 66%, 88%, and 83%, respectively. Correlation with the surgical findings was good (p < 0.0001). Gadolinium-enhanced sequences allowed accurate diagnosis and enabled the creation of prognostic groups having better correlation with surgical findings and postoperative results. CONCLUSION: Gadolinium-enhanced MR imaging is the most reliable imaging method for investigating the vascularity of the proximal pole in scaphoid nonunions.