Ke-Lie Wang,Zi-Qing Zhang,Joseph A Buckwalter,Yi Yang

Abstract

Key words: Supermicrosurgery;Fingertip defects;Split;Tibial flap;Second toe;Reconstruct;Case report

INTRODUCTION

The fingertips are the most frequently injured part of the hand[1,2].The underlying finger pulps play a vital role in functions of daily life such as sensation,fine touch,and grip perception.It is imperative to manage fingertip injuries with the goal of obtaining a painless,functional finger with protective sensation[3].

Given the complexity of fingertip injuries,successful replantation of amputated finger pulp is not always possible.Therefore,numerous surgical options have been reported for finger pulp reconstruction with good functional and sensory outcomes,such as V-Y advancement,pedicle flaps,free flaps,and toe pulp transfer[1,2,4-15].

The purpose of this report is to describe a novel reconstructive method to restore function and sensation after injury to three finger pulps by using the split second toe tibial flap.

CASE PRESENTATION

Chief complaints

A 24-year-old male presented to our hospital,with a shearing,crush-type injury to multiple fingertips of the right hand,resulting in exposed distal phalanges of the middle,ring,and small fingers.The amputated distal stumps were retrieved,but due to the nature of the injury,replantation was not possible.

History of past illness

The patient was a healthy,non-smoker,without signs of tinea pedis or unguium.A variety of reconstruction strategies were presented to the patient and his family,including stump revision amputation,V-Y flap advancement,and pedicle or free flap coverage.

FINAL DIAGNOSIS

After consideration of the options,the patient elected for free flap coverage in order to potentially achieve better functional recovery.

TREATMENT

Initially,the patient underwent irrigation and debridement of the injured fingertips with vacuum-assisted closure (VAC) to cover the wounds.Three days later,we covered the fingertip defects by performing a right second toe split tibial flap using local anesthesia at the harvest site and brachial plexus nerve block for the right upper extremity.The defects of the right middle,ring,and small finger measured 1.8 cm2×1.5 cm2,1.5 cm2× 1.2 cm2,and 1.2 cm2× 1.0 cm2,respectively (Figure 1A).A 1.6 cm2×4.5 cm2tibial second toe flap was then harvested and accordingly split into three small flaps as F1,F2,and F3 under the microscope with respective flap areas of 1.3 cm2× 1.0 cm2,1.6 cm2× 1.2 cm2,and 1.8 cm2× 1.5 cm2(Figure 1B-D).The F3,F2,and F1 were transferred to middle,ring,and little fingertips with the one artery (the diameter for F3,F2,F1 was 0.8,0.5,0.4 mm,respectively),one vein (the diameter for F3,F2,F1 was 0.9,0.8,0.5 mm,respectively),and one nerve (the diameter for F3,F2,F1 was 1.0,0.8,0.6 mm,respectively) (Figure 2A-C).The anastomoses were completed to the recipient sites by using 11-0 Prolene suture under the microscope,and the donor site was closed with full thickness skin graft.

Post-operatively,Cefuroxime were administered for three days;Papaverine hydrochloride was administered intramuscularly (30 mg,q6h→qd,day1→day 7) for seven days;and Heparin was continually administered intravenously (12500 IU every 24 h)for seven days.Blood coagulation function was monitored every two days to ensure the activated partial thromboplastin time exceeded no more than 1.5 times of the normal level.The patient remained non-weight bearing for both the right upper extremity and right lower extremity,and was discharged from the hospital without any noted complications.

OUTCOME AND FOLLOW-UP

At 6-mo follow-up,the patient had no donor site or harvest site complications (Figure 3A and B),and reported no residual pain or cold intolerance.All three of the reconstructed fingertips had some preserved nail growth,measuring 17 mm,13 mm,and 10 mm of the middle,ring,and small fingers,respectively.Semmes-Weinstein Monofilament testing was equal to the contralateral side with the 2.83 of the right middle,ring,and small fingertips.The Static Two-Point Discrimination (s2PD)measurements were 8 mm,9 mm,and 8 mm in the right middle,ring,and small fingertips,while in the contralateral side the measurements were 6 mm,5 mm and 4 mm,respectively.

DISCUSSION

The fingertips perform unique and significant functions of daily life such as sensation,fine handling,and gripping[1,2],and they are the most frequently injured part of the hand.For these reasons,it is of vital importance to treat fingertip injuries with careful strategy to achieve pain-free,quality functional and sensory outcomes.In cases where replantation of an amputated fingertip is not feasible,numerous reconstructive options exist[2-16].When considering the appropriate surgical technique and reconstruction options,a surgeon should deliberate on the characteristics of the injury,the advantages and disadvantages of the reconstructive method,and the potential for recovering of function,especially for cases involving multiple fingertips injuries.

This case report offers a novel reconstructive option for the management of multiple fingertip injuries.In this case,the patient had no surgical or post-operative complications,and reported no pain,cold intolerance,or functional deficits.Although the patient reported no perceived functional or sensory deficits,the s2PD measurements were decreased compared to contralateral side.These s2PD measurements were all less than 10mm and Semmes-Weinstein Monofilaments testing was equal to the contralateral side,indicating a satisfactory sensory outcome.

CONCLUSION

The concept of supermicrosurgery has found increasing clinical applications in recent years[16].With supermicrosurgery,the dissection and anastomosis of very small caliber structures with minimal donor-site morbidity had become a reasonable option.The split tibial second toe flap utilized for this patient is an advanced application of supermicrosurgery,in which the multiple defects were covered with one single split flap.This report is noteworthy for its originality and application of supermicrosurgery.Supermicrosurgery should continue to be explored and considered as a feasible option for fingertip defect reconstruction and other diseases treatment such as lymphedema,nerve repair,organ transplantation,and free flaps in the future.

Figure1 Split tibial second toe flap

Figure2 F3,F2,and F1 were transferred to middle,ring,and little fingertips with the one artery.

Figure3 Six months after the surgery.