The intercostobrachial nerve as a sensory donor for hand reinnervation in brachial plexus reconstruction is a feasible technique and may be useful for restoring sensation

O uso do nervo intercostobraquial como doador na restauração cirúrgica da sensibilidade da mão em lesões do plexo braquial é uma técnica anatomicamente viável e pode ser útil para a recuperação sensitiva

ABSTRACT

Objective

Few donors are available for restoration of sensibility in patients with complete brachial plexus injuries. The objective of our study was to evaluate the anatomical feasibility of using the intercostobrachial nerve (ICBN) as an axon donor to the lateral cord contribution to the median nerve (LCMN).

Methods

Thirty cadavers were dissected. Data of the ICBN and the LCMN were collected, including diameters, branches and distances.

Results

The diameters of the ICBN and the LCMN at their point of coaptation were 2.7mm and 3.7mm, respectively. The ICBN originated as a single trunk in 93.3% of the specimens and bifurcated in 73.3%. The distance between the ICBN origin and its point of coaptation to the LCMN was 54mm. All ICBNs had enough extension to reach the LCMN.

Conclusion

Transfer of the ICBN to the LCMN is anatomically feasible and may be useful for restoring sensation in patients with complete brachial plexus injuries.

brachial plexus; intercostal nerves; median nerve; nerve transfer; sensation

RESUMO

Objetivo

Poucos doadores estão disponíveis para a restauração da sensibilidade em pacientes com lesões completas do plexo braquial (LCPB). O objetivo deste estudo foi avaliar a viabilidade anatômica do uso do nervo intercostobraquial (NICB) como doador de axônios para a contribuição do cordão lateral para o nervo mediano (CLNM).

Métodos

Trinta cadáveres foram dissecados. Os dados do NICB e do CLNM foram coletados: diâmetros, ramos e distâncias.

Resultados

Os diâmetros do NICB e da CLNM no ponto de coaptação foram 2,7mm e 3,7mm, respectivamente. O NICB originou-se como um único tronco em 93,3% dos espécimes e bifurcou-se em 73,3%. A distância entre a origem do NICB e seu ponto de coaptação com a CLNM foi de 54mm. Todos os NICBs tiveram extensão suficiente para alcançar a CLNM.

Conclusão

A transferência do NICB para a CLNM é anatomicamente viável e pode ser útil para restaurar a sensibilidade em pacientes com LCPB.

plexo braquial; nervos intercostais; nervo mediano; transferência de nervo; sensação

The main target of surgical reconstruction in patients with severe traumatic injury of the brachial plexus is motor recovery, with special attention to proximal muscles of the arm. A second target is sensory recovery of the hand to gain protection. Although it is not a common practice in most cases, sensory restoration of an anesthetic hand should be included in the surgical management of these patients.

Transfers of supraclavicular (SCN) and intercostal nerves (ICNs) to the lateral contribution of the median nerve (LCMN) for this purpose have been reported but the studies had a small number of patients and the results were inconsistent¹,²,³,⁴,⁵.

The intercostobrachial nerve (ICBN) arises from the second intercostal nerve as its lateral cutaneous branch⁶, and the axilla and posteromedial aspect of the arm has been related as its cutaneous area of innervation⁷. This nerve has been described in anatomical and clinical studies of axillary approaches to metastatic cancer, lymph node clearance, breast cancer and plastic surgery⁸,⁹,¹⁰,¹¹,¹²,¹³,¹⁴. The use of the ICBN as a donor nerve for brachial plexus injury was once described by Hattori et al.¹⁵, but in association with ICNs and with no anatomical background study.

The purposes of this study were to determine the anatomical feasibility of using the ICBN as a sensory donor in a nerve transfer to the lateral cord contribution to the median nerve (LCMN) (Figure 1), and to compare the ICBN with the SCN and the lateral cutaneous branch of the third intercostal nerve (3^rdICN) in terms of the number of fibers.

Figure 1
Schematic drawing of the nervous structures in the axilla (a) and of the proposed nerve transfer of the intercostobrachial nerve to the lateral cord contribution to the median nerve (b) (From the authors archive).

METHODS

Anatomical study

A prospective study of 30 non-fixed cadavers was performed from September 2010 to October 2011. For standardization, dissections were performed on the right side in supine position with the right arm abducted 45 degrees. The SCN, the ICBN, the 3^rdICN and the LCMN were dissected by supraclavicular, thoracic-axillary and infraclavicular approaches, respectively.

The SCN is a very superficial nerve that emerges as a single trunk from the cervical plexus (ventral rami of C3 and mainly C4 spinal nerves) and innervates the skin over the upper chest and shoulder. It was dissected in the supraclavicular region, in its descending route in the posterior triangle of the neck underneath the platysma muscle, separating it from the surrounding subcutaneous tissue. Then, a longitudinal incision was made along the anterior axillary line starting in the posterior part of the lateral border of the pectoralis major muscle and prolonging downward until the fourth intercostal space. The fat tissue in the axillar region was dissected and mobilized carefully. The ICBN and the 3^rdICN were identified within this fat tissue, emerging from the second and third intercostal spaces, respectively, and dissected distally towards the lateral chest skin and axillar region. The ICBN was then reflected towards the infraclavicular space to reach the LCMN below the pectoralis major muscle. Finally, a deltopectoral incision was made, the cephalic vein was mobilized and the deltoid and the pectoralis major muscles were retracted. The pectoralis minor muscle was identified, arising from the coracoid process, and was divided to expose the infraclavicular plexus beneath the fat pad. The LCMN was isolated and divided at its origin in the lateral cord to be turned down towards the axilla for coaptation with the ICBN.

Photographs (Nikon Coolpix S630, Tokyo, Japan) were taken of important details of all dissections, some of which were selected to illustrate the study.

Data on age, sex, height and weight were obtained and the following information about the ICBN were collected: the diameter and the number of branches at its origin and at its distal part, the distance between its origin and ramifications, the diameter at the point of coaptation to the LCMN in the nerve transfer proposed and the distance between its origin and the point of coaptation to the LCMN. Measurements of the LCMN diameter at the point of coaptation were also collected. The measures were made with a plastic pachymeter (Vonder, Tianjin, China).

In the last ten cadavers dissected, the nerve fragments were collected for processing and histomorphometric analysis. The three nerves (SCN, ICBN, 3^rdICN) were sectioned as distally as possible, and the distal fragments were then obtained. The LCMN was sectioned as proximally as possible after its microsurgical separation from the lateral cord, and a fragment was obtained from this extremity. These procedures were performed to simulate the real conditions identified in the nerve transfer surgery (Figure 2).

Figure 2
Photos of anatomical dissections: a) lateral view of the thorax showing the intercostobrachial nerve under the pectoralis major muscle; b) intercostobrachial nerve origin in the second intercostal space; c) anterior view of the thorax showing the intercostobrachial nerve in its original position; d) after being sectioned distally and displaced in the subpectoral space, the intercostobrachial nerve reaches the elements of the brachial plexus in the deltopectoral groove (From the authors archive).

The Ethics Committee previously approved this study.

Histomorphometric analysis and fiber counting

The fragments of the four nerves (SCN, ICBN, 3^rdICN and LCMN) were fixed in a paraformaldehyde solution (4% in saline solution, pH 6.9) for 24 hours and then cryopreserved in a 10% saccharose solution and frozen in isopentanol (-60ºC). Adjacent serial thaw-mounted 14 µm sections were obtained with a cryostat from the nerve fragments. The sections were sampled systematically during sectioning. One section from each nerve fragment was obtained. Immunoreactivity for the neurofilament 200 kDa (NF-200, Sigma, St. Louis, USA) was assessed¹⁶. For this, sections were washed for 3x10 min in PBS and incubated with 5% milk for 60 min, followed by 0.05% hydrogen peroxide for 45 min. The sections were washed again in PBS (3 x 10 min) and incubated with NF-200 diluted 1:2200 for 48 h. Immunoreactivity was visualized using 3-3’-diaminobenzidine tetrahydrochloride as a chromogen. This process resulted in fibers that were marked and able to be counted. The sections were analyzed and photographed with a photomicroscope (Olympus AX70, Tokyo, Japan). Quantification of the fibers was performed using stereology in microphotographs of each nerve using Adobe^® Photoshop^® 5S software (San Jose, USA) with a magnification of 40x.

Statistical analysis

The values were expressed as the mean ± standard deviation. Statistical analysis was performed using SPSS version 20.0.0 software (Chicago, USA). After evaluating the sample distribution with a Shapiro-Wilk test and the equality of variances using the MANOVA, the paired t-test was used to compare the number of fibers of the potential donors (SCN, ICBN and 3^rdICN) with each other and with the recipient nerve (LCMN). A p value less than 0.05 was considered statistically significant.

RESULTS

Of all cadavers, twenty-two were male and eight were female, with a mean age, height and weight of 62 years (range 33–83 y), 165 ± 9 cm and 59.5 ± 12.8 Kg, respectively.

The intercostobrachial nerve was present in all cadavers during the axillary dissections, piercing the serratus anterior muscle and emerging under the second rib. All of the ICBNs dissected had enough extension to directly reach the LCMN, with an average distance of 54 ± 10 mm from their origin to the point of coaptation with the recipient nerve.

The mean diameter of ICBN at its origin and at the point of coaptation was 2.08 ± 0.67 mm and 2.74 ± 0.87 mm, respectively. The mean diameter of the LCMN was 3.69 ± 1.07 mm.

Twenty-eight (93.3%) ICBNs were single trunk at their origins, with only one already divided into two and another into three branches at their origin in the second intercostal space.

There was a variation of branching in the axillary course until it reached the arm. Seven nerves had divided into three branches distally, 22 had two branches and one reached the arm as a single trunk (Figure 3). Four of them had a communication with the brachial plexus and one was connected to the lateral cutaneous branch of the third intercostal nerve. Apparently, because of their angulation, these communications seem to be a contribution from the ICBN to the elements of the brachial plexus (medial brachial cutaneous nerve) (Figure 4). The anatomical data are summarized in Table 1.

Figure 3
Photo of anatomical dissection: lateral view of the axilla showing the origin of the ICBN and its ramifications (From the authors archive).

Figure 4
Photo of anatomical dissection: anterior view of the axilla after section and medial retraction of the pectoralis major muscle showing a communication/contribution of the intercostobrachial nerve contribution to the medial brachial cutaneous nerve, and the ulnar nerve repaired by a white silicone loop (From the authors archive).

Table 1
Anatomical study data.

Case	Age (years)	Height (cm)	Weight (Kg)	Diameter ICBN origin (mm)	Diameter ICBN coaptation (mm)	Number of rami in origin	Number of branches	Distance origin - branching (mm)	Distance origin - coaptation (mm)	Diameter LCMN (mm)
Minimum	33	147	36.4	0.5	1	1	1	0	36	1.5
Maximum	83	186	86	4	4	3	3	73	81	5.5
Average	62	166	59.5	2.1	2.7	1.1	2.2	23.8	54	3.7
Median	62	166	59.2	2	2.7	1	2	22.5	54	3.8
SD	14.3	10	12	0.7	0.8	0.4	0.5	17.9	10	1.1

• ICBN: intercostobrachial nerve; LCMN: lateral cord contribution to the median nerve.

The mean number of fibers in the ICBNs was 984 ± 517, 470 ± 266 in the ICNs, 693 ± 511 in the SCNs and 5273 ± 1134 in the LCMNs. Detailed data on the fiber counting are shown in Table 2. The ICBN number of fibers was significantly greater than the 3^rdICN number of fibers (p = 0.012). Although the mean values of the ICBN (984 fibers) and the SCN (693 fibers) were discrepant, the statistical analysis showed no significant difference between them (p = 0.082). Similarly, there was no significant difference comparing the number of fibers of the SCN and the 3^rdICN (p = 0.160). All potential donors (ICBN, 3^rdICN and SCN) presented significant differences when compared with the LCMN (p < 0.001). Detailed data on the statistical analysis are shown in Table 3. An example of fiber counting is shown in Figure 5.

Table 2
Fiber counting.

Values	ICBN	3rdICN	SCN	LCMN
Minimum	341	118	213	3622
Maximum	2035	1054	1727	7201
Median	910	456	525	5096
Average	984	470	693	5273
SD	517	266	511	1134

• ICBN: intercostobrachial nerve; 3^rdICN: lateral cutaneous branch of the third intercostal nerve; SCN: supraclavicular nerve; LCMN: lateral cord contribution to the median nerve; SD: standard deviation.

Table 3
Comparative analysis* of number of fibers of the nerves.

Variable	Mean ± SD		p
	n1	n2
ICBN x 3rdICN	984 ± 517	470 ± 266	0.012
ICBN x SCN	984 ± 517	692 ± 511	0.082
3rdICN x SCN	470 ± 266	692 ± 511	0.160
ICBN x LCMN	984 ± 517	5272 ± 1134	< 0.001
3rdICN x LCMN	470 ± 266	5272 ± 1134	< 0.001
SCN x LCMN	692 ± 511	5272 ± 1134	< 0.001

• ICBN: intercostobrachial nerve; 3^rdICN: lateral cutaneous branch of the third intercostal nerve; SCN: supraclavicular nerve; LCMN: lateral cord contribution to the median nerve; SD: standard deviation. *paired t-Test

Figure 5
Microphotography of an intercostobrachial nerve section (a), showing the fibers and a selection area (b) to exemplify the fiber counting for the histomorphometric analysis (From the authors archive).

DISCUSSION

Patients with a complete brachial plexus injury have anesthetic hands, exposing them to frequent secondary injuries such as burns and cuts. Even minor repetitive traumas can result in lesions, infections and, in extreme cases, loss of tissue of the hand/fingers¹⁷,¹⁸.

Sensory reconstruction with intercostal and supraclavicular nerves can provide only a limited recovery of sensibility in the hand³,⁴,¹⁵,¹⁹,²⁰,²¹,²²,²³,²⁴. The need for better results for sensory recovery in the hand following brachial plexus surgery led us to search for a new alternative to previously-described techniques. For this purpose, we focused this anatomical study on the feasibility of using the intercostobrachial nerve as a donor nerve to the lateral cord contribution to the median nerve.

Loukas et al.¹¹described that the ICBN is anatomically constant, and Maycock et al.²⁵ reinforced the idea that the ICBN is responsible for the cutaneous innervation of the axilla region and the medial and posterior aspects of the arm. Thus, this nerve has an area of cortical representation closer to the hand area than the SCN and the ICNs²⁶. This theoretically makes its use more favorable than other nerves (SCN and ICNs) in the sensory reconstruction of the brachial plexus, making the achievement of a better recovery and perception of stimuli likely.

Some authors have reported the absence of ICBN in up to 6% of subjects¹⁰,¹⁴,²⁷, but the present study confirmed the presence of ICBN in all of the dissections. The ICBN was identified as a single trunk at its origin in 93.3% of the cases dissected. The description of this pattern ranged from 74% to 81.3% in other studies⁸,¹⁰,¹⁴,²⁸.

In this study, the average diameter of the ICBN at its origin in the second intercostal space was 2.1 ± 0.7 mm, similar to the result of 1.89 ± 0.44 mm described by Zhu et al.¹⁴. Furthermore, the distance between the origin and its apparent branching point was 23.8 ± 17.9 mm, values also similar to those obtained by other authors¹⁴,²⁹.

As the cortical topography of the ICBN cutaneous territory is closer to the hand area than that of the other potential donors, we believe that the brain plasticity phenomenon is facilitated and, therefore, the results of hand sensory recovery should be better, both in terms of intensity and of localization of the stimulus perception.

Considering the number of fibers, the ICBN has a mean value greater than the other potential donors of the sensory axons. This could appear to be an advantage, but we have to remember that usually at least two ICNs are used when this is the chosen nerve transfer. When compared to the SCN, there was no significant difference between them. However, Ihara et al.¹⁹ reported better results in sensory restoration with the use of intercostal nerves than with the supraclavicular nerve. In conclusion, the advantages of using the ICBN are the proximity to the target, the better functional cortical topography and the representative number of fibers.

This study has some limitations. As our dissection of the ICBN aimed to reproduce the surgical conditions of a transfer to the LCMN, the dissection was not prolonged distally toward the arm and was interrupted when a sufficient length of the ICBN was achieved to reach the LCMN and the proposed technique could be applied. Thus, some of the communication of the ICBN with other nerves of the upper limb were probably not visualized and described, as they were in other studies¹¹,¹²,¹⁴,³⁰.

Despite the limitations, our study confirmed the anatomical feasibility of a direct coaptation, without interposition grafts and without tension, between the ICBN and the LCMN through dissection of an average extension of 54 ± 10 mm from the origin of donor nerve to the coaptation point to the recipient nerve. The anatomical variations did not seem to be an obstacle to the use of this technique, which may be useful to restore protective sensation in the hands of patients with complete brachial plexus injury and may become an important contribution to the armament of nerve surgeons.

After completion of this anatomical study, a clinical study was started to evaluate the clinical applicability of the method.

ACKNOWLEDGMENTS

The authors gratefully acknowledge the great contribution of those who gave us permission to dissect their bodies and/or their families.

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Publication Dates

• Publication in this collection
  July 2017

History

• Received
  03 Feb 2017
• Accepted
  15 Feb 2017