Treatment of thumb soft-tissue defects using a bipedicle island flap of the index finger: anatomical basis and clinical application

Propeller Perforator Flaps Used for Hand and Digit Reconstruction: A Systematic Review

Background

Propeller perforator flaps (PPFs) have increased in popularity due to the freedom in design and ability to cover a variety of defects without sacrificing the major vessels. Present reports of PPFs for upper limb reconstruction have not provided guidance for hand reconstruction, specifically. This study aims to review the current literature and evaluate techniques for use of PPFs in hand reconstruction.

Methods

A comprehensive literature review was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines for articles published from 1991 to 2021. The database search was queried for records using appropriate Medical Subject Headings (MeSH) terms. Studies reporting PPFs were limited to English language and excluded lower extremity or upper extremity reconstruction not specific to defects in the hand or digits. Study characteristics, patient demographics, indications, preoperative testing, flap characteristics, flap survival, and complication rates were collected.

Results

Out of the initial 1,348 citations yielded, 71 underwent full-text review. Ultimately, 25 unique citations were included encompassing 12 retrospective reviews (48%), 3 prospective cohort studies (10%), and 10 case series (40%). In review, 525 patients underwent reconstruction with a total of 613 propeller flaps performed to repair defects of the hand, digits, or both with use of 18 unique flap types. Overall flap survival was 97.8%. Acute wounds accounted for 72.9% of performed reconstructions. The mean flap coverage was 14.7 cm2. Complications occurred in 19.8% of cases, with venous congestion and partial flap necrosis occurring in 5.5 and 6.5% of cases, respectively, leading to a flap failure rate of 2.1%.

Conclusion

PPFs are a reliable option for hand or digital reconstruction, allowing surgeons to cover a variety of defects without sacrificing local vasculature. Despite nearly a 20% reported complication rate, nearly all flaps with venous congestion and partial flap necrosis included in these articles resolved without the need for secondary intervention, retaining an excellent overall flap survival.

Long-term outcome of fingertip reconstruction with the homodigital neurovascular island flap

INTRODUCTION

Fingertip injuries are frequent and several surgical strategies exist to reconstruct the amputated part and restore function and appearance. Yet, long-term results are rarely published. The purpose of this study was to examine the long-term clinical outcome of neurovascular island flaps for traumatic fingertip amputation of Allen type III/IV injuries.

MATERIALS AND METHODS

We retrospectively analysed a cohort of patients with traumatic fingertip amputation that underwent reconstruction with a neurovascular island flap from January 2003 to December 2014. No mandatory splinting was applied after surgery. 28 participants (29 fingers) were available for follow-up at mean 8 years after reconstruction. Activities of daily living were measured with the disabilities of the arm, shoulder and hand questionnaire. Grip strength and finger motion were assessed using a Jamar dynamometer and a goniometer. Two-point discrimination and Semmes-Weinstein monofilaments were used to evaluate sensory recovery.

RESULTS

No intraoperative complications occurred and all flaps survived. Mean flap size was 4.7 ± 0.6 cm². Active motion of the fingers was over 95% of the contralateral side at follow-up. Three patients showed mild extension lag of the proximal interphalangeal joint. The grip strength of the affected hand and of each of the affected fingers was over 70% of the contralateral side. In comparison to the contralateral side we did not detect any significant difference for the Semmes-Weinstein monofilament test, but two-point discrimination (5.1 ± 1.7 mm) was significantly impaired. According to the Lim classification 1 of 14 nails with hook nail deformity showed grade 3 breaking of the nail. The DASH score was 16.0. All patients returned to their original occupation and patient satisfaction with the procedure was high.

CONCLUSIONS

The risk for disabling flexion contracture seems to be small even without mandatory splinting. Neurovascular island flaps for fingertip amputation of Allen type III/IV injuries are a reliable tool in fingertip reconstruction in the long term.

Reconstruction of extensive pulp defects of the thumb with a radial-based pedicled flap from the index finger

This article defines a sensate, pedicled heterodigital flap from the proximal radial side of the index finger for reconstructing large soft tissue defects of the thumb. The pedicle consists of the radial digital artery of the index finger. Dorsal sensory branch of proper digital nerve and one of the terminal sensory branches of radial nerve are included in the flap for sensation. The results of 17 consecutive patients at 24 months revealed mean static two-point discrimination of 7 mm at the reconstruction site and 10 patients were able to feel 4 mm at the reconstructed thumb. The mean range of motion of metacarpophalangeal and interphalangeal joints of operated thumbs reached 94% and 66%, the mean grip span reached 96% compared with the uninjured side. The presented flap provided a simple yet favourable alternative for reconstruction of the thumb tip, with thick and durable tissue requiring minimum dissection and donor side morbidity. Level of evidence: IV.

Conservative treatment of fingertip injuries in children - first experiences with a novel silicone finger cap that enables woundfluid analysis

Introduction: Human fingertips are able to regenerate soft tissue and skin after amputation injuries with excellent cosmetic and functional results when treated with semiocclusive dressings. Despite bacterial colonizations, proceeding infections are not reported with this management. The underlying mechanisms for this form of regenerative healing as well as for the resilience to infections are not known. Due to the lack of mechanical protection, the leakage of maloderous woundfluid and the sometimes challenging application, conventional film dressings have their problems, especially in treating young children. We therefore treated selected patients with a novel silicone finger cap with an integrated wound fluid reservoir that enables atraumatic routine wound fluid aspiration.

Methods: We report on 34 patients in between 1 and 13 years with traumatic fingertip amputations primarily treated with occlusive dressings. 12 patients were treated with a novel silicone finger cap. We summarized clinical data for each patient. This included photographs and microbiological results from wound fluid analyses, whenever available.

Results: The results of both, conventional film dressing and silicone finger cap treatment, were excellent with no hypersensitivity and no restrictions in sensibility and motility. Even larger pulp defects were rearranged in a round shape and good soft tissue coverage of the distal phalanx was achieved. Nail deformities were not observed. We detected a wide spectrum of both aerobic and anaerobic bacteria in the wound fluids but infections were not observed. Epithelialization times did not differ significantly and no severe complications were seen in all primarily conservatively treated patients.

Conclusion: This study provides preliminary data demonstrating that the treatment with the silicone finger cap leads to excellent clinical results in wound healing. Interestingly, the wounds were colonized with a wide range of bacteria including species that may cause wound infections. However, we saw no proceeding inflammation and the regeneration was undisturbed. In the future, the efficacy of this new management should be evaluated in randomized, controlled clinical trials to confirm the results under standard conditions and get more insight into the role of the wound microbiome as well as other factors that may promote regeneration. The aspirable Reservoir of the finger cap will enable easy atraumatic sampling of wound fluids both for diagnostic and for research purposes as well as possibly allowing direct administration of pro-regenerative drugs in the future.

Superficial Radial Nerve Transection Improves Sensory Outcomes in First Dorsal Metacarpal Artery Flaps

BACKGROUND

This article reports the operative technique and clinical effect of repairing thumb pulp defects using a modified first dorsal metacarpal artery flap method. In this method, the dorsal branches of the radial and ulnar proper digital nerves of the index finger were preserved but the superficial branches of the radial nerve were transected.

METHODS

Data obtained from 121 patients with thumb pulp defects who were admitted to the authors' hospital from June of 2011 to December of 2014 were retrospectively analyzed. Patients were divided into two groups based on whether the superficial branches of the radial nerve were transected. The dorsal branches of the radial and ulnar proper digital nerves of the index finger and the proper digital nerves in the wound were coapted using the end-to-end style. Static two-point discrimination, Semmes-Weinstein monofilament scores, pain, cold intolerance of the reconstructed finger, allachesthesia, and patient satisfaction were compared between the two groups.

RESULTS

The authors observed significant differences in static two-point discrimination, Semmes-Weinstein monofilament flap score, pain of finger pulp, allachesthesia duration, and patient satisfaction (p < 0.05). The transection group presented slightly better discriminatory sensation in the flap and higher patient satisfaction. In addition, the duration of allachesthesia in the transection group was significantly shorter than that in the preservation group.

CONCLUSION

In the repair of thumb pulp defects using a modified first dorsal metacarpal artery flap carrying the dorsal branches of the radial and ulnar proper digital nerves of the index finger, transecting the superficial branches of the radial nerve achieved better clinical outcome compared with preserving them.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, III.