Journal List > J Korean Soc Surg Hand > v.22(3) > 1106564

Yoo, Park, and Kim: Traumatic Brachial Plexus Injury: Preoperative Evaluation and Treatment Principles

Abstract

Brachial plexus injury is regarded as one of the most devastating injuries of the upper extremity. Accurate diagnosis is important to obtain the successful results. Basic preoperative evaluation includes simple radiography, cervical myelography. Magnetic resonance imaging, angiography, electrophysiologic studies and intraoperative studies. Furthermore, proper timing of surgery, surgical indication, plan and sufficient understanding of patients about the prognosis are the key for the satisfactory outcomes. This article provides an overview of the evaluation, diagnosis, intraoperative monitoring, and proper surgical planning for the treatment of posttraumatic brachial plexus injuries.

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Fig. 1.
The anatomy of the brachial plexus. USS, upper subscapular; TD, thoracodorsal; LSS, lowere subscapular; MBC, medial brachial cutaneous; MABC, medial antebrachial cutaneus.
jkssh-22-137f1.tif
Fig. 2.
Traction injury of the brachial plexus. (A) Preganglionic injury cannot be repaired, (B) postganglionic stretch injury shows different magnitudes, and (C) extraforaminal rupture can be repaired with surgery
jkssh-22-137f2.tif
Fig. 3.
Double approach of brachial plexus injury (superior clavicular and deltopectoral approach).
jkssh-22-137f3.tif
Fig. 4.
Electrophysiological evaluation during the surgery. (A) Intraoperative electro-physiologic monitoring of 55-year-old male with C8–T1 brachial plexus injury. (B) These lines means the preoperative and intraoperative base amplitude of C8-T1. SNS, sypathetic nerve stimultation.
jkssh-22-137f4.tif
Fig. 5.
Nerve transfer of a 19 years-old male with right C5–6 brachial plexus injury after motorcycle accident. (A) The patient showed complete motor deficit in active elbow flexion and shoulder abduction. (B) Magnetic resonance image showed C5–6 nerve injury. (C) The 3–4 Intercostal nerves transfer to the musculocutaneous nerveand spinal accessory nerve transfer to the suprascapular nerve were performed at 7 months after injury. (D) Muscle strengths of elbow flexion and shoulder abduction were recovered at 16 months after surgery. SA, spinal accessory nerve; SSC, superior subscapular nerve; IC, intercostal nerve; MC, musculocutaneous nerve.
jkssh-22-137f5.tif
Fig. 6.
Functioning muscle transfer of a 64-year-old male who had crushing injury to his right arm at 1 year before the surgery. (A) The patient showed complete loss of active elbow flexion and shoulder abduction. (B) Gracilis muscle with monitoring flap was harvested from his right thigh. (C) Flap indicated well survival of free muscle transfer. (D) The patients showed excellent recovery of elbow flexion at 6 months after surgery.
jkssh-22-137f6.tif
Table 1.
Clinical signs of preganglionic injury and its implications
Signs Implications
Horner syndrome Sympathetic ganglion injury (T1 level)
Winged scapula Long thoracic nerve injury (C5–7)
Atrophy of parascapular muscle Dorsal scapular nerve injury (C4–5)
Cervical paraspinal muscle weakness and loss of posterior neck sensation Dorsal rami of cervical spinal nerve roots injury
Hemidiaphragm paralysis Phrenic nerve injury (C3–5)
Absence of Tinel sign in neck area Absence of proximal spinal nerve stump
Pseudomeningocele on myelogram Development of meningeal diverticulum after healing of torn nerve root sleeve
Intact sensory nerve action potentials in the area of sensory deficit Imply no wallerian degeneration of the sensory axons because the attached nerve cells reside in the dorsal root ganglion

Adapted from Limthongthang et al.6, Orthop Clin North Am. 2013;44:591-603, with permission of Elsevier.

Table 2.
Root innervation and motor functions in the upper extremity (from Robert et al.7)
C6
C8
C5 C7 T1
Serratus anterior Flexor Flexor Opponence pollicis Abductor
Deltoid Biceps Pronator Digitorum Digitorum Pollicis
Superficialis Superficialis Brevis
Flexor Palmaris
Carpi Longus
Radialis
Triceps Flexor Flexor Adductor
Pollicis Pollicis Pollicis
Longus Brevis
Brachialis Extensor Extensor Abductor
Carpi Carpi Digit
Radialis Ulnaris Minimi
Supra-spinatus Brachioradialis Extensor Abductor Flexor Palm
Digitorum Pollicis Digitorum Interossei
Communis Longus Profundus
Extensor
Pollicis
Brevis
Extensor Dorsal
Pollicis Interossei
Longus
Infra-spinatus Supinator Flexor
Carpi
Ulnaris
Teres major Latissimus dorsi
Pectoralis major
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