Traumatic Dorsal Hand Reconstruction through A free Anterolateral Thigh Flap, Induced Membrane Technique, Toe Joint Transfer, and Joint Prosthesis.

Introduction: This study presents a case of post-traumatic dorsal hand reconstruction by describing the surgical technique in several stages and the outcome. Case report: It involves a patient with loss of cutaneous tissue, loss of bone, and tendon in the dorsal hand and fingers following a car accident. He was treated on a four-stage hand salvage and reconstruction. Stage one fulfilled in emergency involved K-wire and osseous filling through acrylic cement, hunter tendon rods, and a free anterolateral thigh flap. The second stage at 2 months involved osseous grafts and finger joint prostheses. The third stage time at 7 months involved a toe joint transfer. The last stage at 11 months involved extensor tendons graft reconstruction. The functional outcome at 2 years is acceptable.
Conclusion: The post-traumatic dorsal hand reconstruction requires several techniques to reconstruct the losses of substances observed and this in several stages. It allowed to have an acceptable hand function. Copyright: © Indian Orthopaedic Research Group.

The traumatic hand dorsum salvage requires several techniques of reconstruction at many different stages.

Introduction

The reconstruction of lost tissues in upper limb remains a challenge for the surgeon after there has been a burning, tumoral resection, infection, and trauma [1, 2]. Tissue losses in this area are mainly attributable to trauma [1]. These reconstructions involve a plan and rigorous surgical technique [3]. This study report one case of post-traumatic dorsal hand reconstruction by describing the surgical techniques in several stages, using a free thigh flap, induced membrane technique, a toe joint transfer, several joint prostheses, and describe the outcome.

Case report

GM, a 55-year-old right hand victim of a car accident (hand dragging along the asphalt, hand in contact with door), presented substantial cutaneous, bone, and tendons losses from the dorsum of the hand and of the long fingers (Fig. 1).

Figure 1

Clinical and radiological aspect of dorsal substance loss of the hand.

Index finger (D2): Exposition of proximal interphalangeal joint (PIP), with destruction of half the first phalanx. Middle finger (D3): Exposition of metacarpophalangeal (MP) and PIP with almost complete absence of first phalanx. Ring finger (D4): Exposition of MP and PIP joints with metacarpal and first phalanx tissue loss. Little finger (D5): Exposition of MP and PIP with metacarpal and first phalanx tissue loss. No long finger extensors were remaining, but all pedicles and flexor tendons were left intact. The treatment was fulfilled in several steps. The first stage involved: Bone stabilization through temporary K-wire arthrodesis, bone defect filing through acrylic cement, first stage of an induced membrane technique, setting up the space for later bone graft, setting four hunter tendon rods in silicon restoring the extensor tendons continuity, and leaving the space for future tendon graft (Fig. 2).

Figure 2

Clinical and radiological aspect of the repair of the dorsal substance loss of the hand.

Harvesting a super thin free anterolateral thigh flap (ATF), based on a piercing artery scoped by echo Doppler and raised on fascia superficialis with terminolateral anastomosis on radial artery for the coverage of skin tissue loss of the hand dorsum (Fig. 3).

Figure 3

Free thigh flap.

Stage two was fulfilled 2 months later. It included MP joint salvage of D3, D4, D5, and of PIP D2 using iliac crest bone graft for phalanx reconstruction and reshaping, and NeuFlex prosthesis (silicon prosthesis) for joint reconstruction. The third stage fulfilled 7 months later involved a PIP joint transfer from the third right toe (T3) to D3 (Fig. 4).

Figure 4

Radiological aspect of the articular prosthesis MP3.4 and 5, PPI of D2, joint transfer IPP of D3.

The fourth stage was fulfilled 11 months later and involved: Rebuilding the four extensors through grafts of bilateral plantaris muscle (no palmaris longus available), carrying out PIP D2 radial ligamentoplasty, non-union of the proximal part of toe joint transfer treated by bone graft and plate fixation, and ATF flap final reshaping with D2–D3 syndactyly release. The fourth phase post-operative 4 months later were marked with the strengthening of treated non-union. The patient recovered the use of the hand and began performing heavy household tasks thanks to rehabilitation. A difficulty was reported with the MP flexion in D4 and D5. A remaining PIP ulnar deviation with D2 and D3, PIP extension of D3 remains limited. The patient is nevertheless very satisfied with the result and does not wish further surgery (Fig. 5, 6).

Figure 5

Functional result at 10 months and radiological at 12 months.

Figure 6

Functional result at 2 years.

Discussion

This surgical case shows us that complex tissue loss reconstruction is an uphill task, involving a set of interventions from several surgical subspecialties, requiring microsurgery through each step with acceptable functional outcome. The option of the different steps was justified by the complexity of multi-tissue lesions. And took into account the favorable evolution of each step before continuing. And taking into account the favorable evolution of each step before proceeding with the other steps The first step in emergency is always the debridement that removes any non-viable remaining tissue this coverage wards off infections, and provides protections to underlying structures, thus facilitating further reconstruction practice [1]. We opted for a free ATF depending on the tissue loss area [2]. Bone stabilization is a part of this first stage in emergency while dealing with serious tissue loss. This stabilization is performed through K-wire and acrylic cement to fill up the defect. The use of K-wire in major osseous stabilization facilitates skin coverage over the external fixator [3]. The cement is replaced 3 months later by an autologous corticocancellous graft, after complete scarring of the flap. The crest remains the most frequently harvested site for its graft density and viability [4]. The osseous shaft defect being reconstructed by the autologous graft, the joints received silicone prostheses and toe joint transfer [5]. Both techniques were used at different times first because of the fear of infection then to compare their functional results. The joint function in fingers is more restrained in toe transfer rather than silicone or pyrocarbon arthroplasty [6]. A single joint transfer was performed because it calls for an accurate microsurgery technique, has complications and very often calls for a second practice [5]. Bilateral plantaris muscle tendon was used in view of the loss of tendinous substance. Sticks in silicone enabled the flow of tendon [3]. The readjustment is paramount sometime after hand surgery, especially after such reconstruction both in joint and tendon. The functional outcome is reassuring even if there is still some place for improvements.

Conclusion

The traumatic hand dorsum salvage requires several techniques of reconstruction at many different stages. It can lead to an acceptable function of the hand.

Treatment of post-traumatic dorsal hand requires operational planning in several stages to guarantee a satisfactory functional result.

Declaration of patient consent : The authors certify that they have obtained all appropriate patient consent forms. In the form, the patient’s parents have given their consent for patient images and other clinical information to be reported in the journal. The patient’s parents understand that his names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Conflict of interest:Nil Source of support:None