Dual-Nerve Coaptation Improves Sensory Recovery in DIEP Flap Reconstruction

Restoring the Sensory Map in Autologous Breast Reconstruction

Mastectomy frequently results in a complete loss of breast sensation, a deficit that significantly impairs a patient's quality of life and body image [1, 2]. To address this, surgeons increasingly utilize flap neurotization (the surgical reconnection of donor and recipient nerves) to restore tactile and protective sensation [3, 4]. Meta-analyses of autologous reconstructions show that neurotized flaps significantly improve sensory outcomes, with one study of 662 reconstructions reporting a mean difference of -1.552 in Semmes-Weinstein monofilament scores (p = 0.0001) compared to non-neurotized controls [3]. In a double-blind randomized controlled trial of deep inferior epigastric perforator (DIEP) flaps, patients receiving coaptation of the second or third intercostal nerve demonstrated significantly better thermal recovery, as heat pain was imperceptible in only 10.3% of innervated flaps compared to 42.1% of non-innervated controls (p = 0.004) [5]. While techniques range from direct neurorrhaphy (the suturing of nerve ends) to the use of allografts or conduits, the optimal number of neural connections required for maximal sensory return remains a subject of clinical investigation [6, 1, 7].

Comparing Single and Dual Microsurgical Neurotization

To determine the optimal approach for sensory restoration, researchers conducted a prospective cohort study between 2022 and 2025 evaluating different neurotization strategies in autologous breast reconstruction. The investigation focused on women undergoing either nipple-sparing or skin-sparing mastectomy followed by immediate reconstruction with a deep inferior epigastric perforator (DIEP) flap, a technique that transfers abdominal skin and fat along with its blood supply while sparing the underlying muscle. The primary objective was to compare sensory and patient-reported outcomes between single-nerve and dual-nerve coaptation (the microsurgical splicing of one versus two donor-to-recipient sensory nerves to facilitate reinnervation). The study enrolled a total of 50 patients representing 91 reconstructed breasts. Within this cohort, the dual-nerve group included 23 patients and 43 breasts, while the single-nerve group consisted of 27 patients and 48 breasts. Statistical analysis confirmed that baseline characteristics between the single- and dual-nerve groups were comparable (p > 0.05), providing a balanced foundation to assess whether the additional surgical time required for a second nerve repair translates into meaningful clinical benefits.

Longitudinal Gains in Tactile Thresholds

To evaluate the efficacy of the two surgical techniques, investigators measured tactile thresholds (g/mm²) across nine distinct breast regions. These measurements were obtained using a Pressure-Specified Sensory Device, a specialized clinical tool that quantifies the minimum amount of pressure a patient can detect before registering touch. Assessments were conducted preoperatively and at 3, 6, and 9 months postoperatively to map the trajectory of sensory return through the stages of nerve regeneration. During the initial phase of recovery at the 3-month mark, sensory recovery was similar between groups, with the single-nerve coaptation group reaching 37.3% and the dual-nerve group reaching 39.5% (p = 0.71). However, outcomes began to diverge by the 6-month assessment. At this midpoint, the dual-nerve cohort demonstrated a recovery rate of 56.8% compared to 43.5% in the single-nerve group (p = 0.08), suggesting an accelerating trend of reinnervation. By the end of the study period, the clinical benefit of the dual-nerve technique became statistically evident. Sensory recovery was significantly greater with dual coaptation at 9 months, reaching 65.6% compared to 48.0% in the single-repair group (p = 0.04). For the practicing reconstructive surgeon, these results indicate that while early postoperative sensation may appear comparable regardless of the number of repairs, the long-term sensory ceiling is significantly higher when two nerves are coapted.

Regional Sensitivity and Patient-Reported Quality of Life

The spatial distribution of sensory return revealed that dual-nerve coaptation provides superior reinnervation in specific anatomical zones of the reconstructed breast. At the 6-month postoperative assessment, the dual-repair cohort demonstrated significantly greater recovery in the outer superior region (87.8% versus 41.1%, p < 0.001) and the inner lateral region (47.5% versus 23.4%, p = 0.029). These regional advantages persisted and expanded by the 9-month mark. At this final follow-up, significant differences in recovery were observed in the outer superior region (84.3% for dual versus 51.4% for single, p = 0.008), the outer lateral region (80.6% versus 55.3%, p = 0.047), and the inner lateral region (56.6% versus 32.8%, p = 0.027). These data suggest that utilizing two nerve repairs ensures a more comprehensive sensory map across the breast mound, particularly in the peripheral and superior quadrants that are highly relevant for protective sensation and daily activities. To determine if these objective sensory gains translated into meaningful clinical benefits, investigators administered BREAST-Q surveys at 9 months. This validated patient-reported outcome tool quantifies the impact of breast surgery on a patient's daily life and body image. The results indicated that physiological improvements in tactile thresholds directly correlated with the patient experience. BREAST-Q Sensation scores were significantly higher in the dual-neurotized cohort (2.09 versus 1.41, p = 0.03), reflecting a perceptible difference in how patients felt their reconstructed breasts. Furthermore, this improved sensory feedback was associated with better mental health outcomes, as BREAST-Q Psychosocial Well-Being scores were also significantly higher in the dual-repair group (3.11 versus 2.42, p = 0.01). For the practicing physician, these findings emphasize that dual-nerve coaptation yields measurable improvements in both physical sensation and the overall psychosocial recovery of the patient, justifying the additional microsurgical effort.

References

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