Collateral Branches of the Brachial Plexus As Donors in Nerve Transfers Boþne Grane Brahijalnog Pleksusa – Donori U Transferima Nerava
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Strana 594 VOJNOSANITETSKI PREGLED Vojnosanit Pregl 2012; 69(7): 594–603. UDC: 616.833-089 ORIGINAL ARTICLE DOI:10.2298/VSP110301007S Collateral branches of the brachial plexus as donors in nerve transfers Boþne grane brahijalnog pleksusa – donori u transferima nerava Miroslav Samardžiü*, Lukas Rasuliü*, Novak Lakiüeviü†, Vladimir Bašþareviü*, Irena Cvrkota*, Mirko Miüoviü*, Andrija Saviü* *Neurosurgical Clinic, Clinical Center of Serbia, Faculty of Medicine, University of Belgrade, Belgrade, Serbia, †Neurosurgical Clinic, Clinical Center of Montenegro, Podgorica, Montenegro Abstract Apstrakt Background/Aim. Nerve transfers in cases of directly ir- Uvod/Cilj. Za nervne transfere u sluÿajevima nemoguýno- reparable, or high level extensive brachial plexus traction inju- sti direktne rekonstrukcije visokih ekstenzivnih povreda ries are performed using a variety of donor nerves with vari- brahijalnog pleksusa koje ne podležu direktnoj reparaciji ko- ous success but an ideal method has not been established. riste se razliÿiti donorni nervi. Ovo istraživanje imalo je za The purpose of this study was to analyze the results of nerve cilj da analizira rezultate nervnih transfera kod bolesnika sa transfers in patients with traction injuries to the brachial trakcionom povredom brahijalnog pleksusa u kojima se kao plexus using the thoracodorsal and medial pectoral nerves as donori koriste torakodorzalni i medijalni pektoralni nervi. donors. Methods. This study included 40 patients with 25 Metode. Istraživanjem je bilo obuhvaýeno 40 bolesnika procedures using the thoracodorsal nerve and 33 procedures kod kojih je kao donor za reinervaciju muskulokutaneusa ili using the medial pectoral nerve as donors for reinnervation of aksilarisa u 25 postupaka korišýen torakodorzalni nerv i u 33 the musculocutaneous or axillary nerve. The results were postupka medijalni pektoralni nerv. Rezultati su analizirani analyzed according to the donor nerve, the age of the patient prema donornom nervu, uzrastu bolesnika i vremenu kada and the timing of surgery. Results. The total rate of recovery je operacija izvršena. Rezultati. Ukupna stopa oporavka iz- for elbow flexion was 94.1%, for shoulder abduction 89.3%, nosila je 94,1% za fleksiju podlaktice, 89,3% za abdukciju and for shoulder external rotation 64.3%. The corresponding ramena i 64,3% za spoljnu rotaciju ramena. Odgovarajuýe rates of recovery using the thoracodorsal nerve were 100%, stope oporavka pri korišýenju torakodorzalnog nerva bile su 93.7% and 68.7%, respectively. The rates of recovery with 100%, 93,7% i 68,7%, a pri korišýenju medijalnog pektoral- medial pectoral nerve transfers were 90.5%, 83.3% and nog nerva 90,5%, 83,3% i 58,3%, respektivno. Uprkos oÿi- 58.3%, respectively. Despite the obvious differences in the glednim razlikama u stopama oporavka, statistiÿki znaÿajne rates of recovery, statistical significance was found only be- korelacije ustanovljene su samo za stope i kvalitet oporavka tween the rates and quality of recovery for the musculocuta- muskulokutaneusa i aksilarisa u sluÿajevima kada je kao do- neous and axillary nerve using the thoracodorsal nerve as do- nor korišýen torakodorzalni nerv. Zakljuÿak. Prema našim nor. Conclusion. According to our findings, nerve transfers nalazima, nervni transferi u sluÿajevima gornje paralize u using collateral branches of the brachial plexus in cases with kojima se kao donori koriste boÿne grane brahijalnog plek- upper palsy offer several advantages and yield high rate and susa imaju nekoliko prednosti i daju visoku stopu i dobar good quality of recovery. kvalitet oporavka. Key words: Kljuÿne reÿi: brachial plexus; wounds and injuries; nerve transfer; plexus brachialis; rane i povrede; transfer živca; nn. thoracic nerves; neurosurgical procedures; treatment thoracici; neurohirurške procedure; outcome. leÿenje, ishod. Introduction ries without a nerve available for grafting. Recently, indica- tions for nerve transfers have been extended to high level In the past, nerve transfers were the treatment of choice nerve injuries with extensive gap for grafting and delayed in cases with spinal nerve root avulsion, or those with di- nerve repairs 1, significant bony or vascular injuries in the rectly irreparable proximal lesions, ie very proximal or inju- region of direct repair and previously failed proximal nerve Correspondence to: Miroslav Samardžiý. Neurosurgical Clinic, Clinical Center of Serbia, Koste Todoroviýa 4, 11 000 Belgrade, Serbia. Phone: +38111 3615 582; Fax: +38111 3615 577, Mob.: +381 63 205 591. E-mail: [email protected] Volumen 69, Broj 7 VOJNOSANITETSKI PREGLED Strana 595 repair 2. The main advantage of this procedure over nerve The preoperative diagnosis was made on the basis of grafting is a conversion of proximal high-level injury to a standard clinical, electrodiagnostic and radiologic tests. Us- low-level one 1. ing these methods we diagnosed a variety of injury patterns Nerve transfers have been attempted using a variety of to the C5, C6, and sometimes C7 spinal nerve roots or spinal donor nerves, but an ideal method has not been estabilshed. nerves. Extended upper brachial plexus palsy was present in In general, there are two types of donors: extraplexal, in- 11 patients. cluding intercostal, spinal accessory, phrenic, motor Indications for nerve transfer included preoperatively branches of the cervical plexus, or collateral C7 spinal nerve, documented avulsion of the C5 and C6 spinal nerve roots, or and intraplexal, including proximal spinal nerve stumps or intraoperatively demonstrated directly irreparable very collateral motor branches of the brachial plexus. In fact, the proximal lesion of the corresponding spinal nerves, and high latter presents a distal form of the classic intraplexal nerve lesions with a long nerve gap. Surgical procedures were per- transfer. formed 3 do 16 months (mean 5 months) after injuries, and Nerve transfers using these nerves were performed for 33 patients (82.5%) were treated within 6 months after in- the first time in 1920 by Vulipus and Stoffel (according to jury. Moreover, 17 patients (42.5%) were treated within 3 ref. 3 ), who transferred some of the branches to the pectoral months after the injury. muscles onto the musculocutaneous or axillary nerves. In The extent of surgical exploration was adopted to the 1929 Foerster performed transfer of nerves to the latissimus reliability of the preoperative diagnosis. In the majority of dorsi and subscapular muscles onto the axillary nerve, as re- cases the brachial plexus was explored only infraclavicularly. ported by Narakas 4, 5. Thereafter, in 1948 Lurja (according In diagnostically unclear cases, we performed an additional to ref. 3 ) reported transfer of the pectoral and thoracodorsal supraclavicular exploration limited to the C5 and C6 spinal nerves, particularly onto the musculocutaneous nerve in pa- nerves and upper trunk. tients with upper trunk injuries. In these 44 patients we performed 38 reinnervations of We used these two nerves in nerve transfer for the first the musculocutaneous nerve, 13 using the thoracodorsal time in 1980. Thoracodorsal to musculocutaneous and me- nerve and 25 using the medial pectoral nerve as donors, and dial pectoral to the axillary nerve transfers were performed in 33 reinnervations of the axillary nerve, 20 using the thoraco- a 24-year-old man four months after a motorcycle accident. dorsal nerve and 13 using the medial pectoral nerve as do- Good recovery of both functions was obtained one year after nors (Table 1). Both nerves were used simultaneously in 24 Table 1 Summary of nerve transfers using collateral branches of the brachial plexus as donors Recipient nerve Donor nerve Musculocutaneous Axillary Total Thoracodorsal 9 13 22 Thoracodorsal and intercostal 2 2 4 Thoracodorsal and subsapular or long thoracic 2 5a 7 Medial pectoral 21 9 30 Medial pectoral and spinal accessory or intercostal 4b 4c 8 Total 38 33 71 a – one case combined with the long thoracic nerve b – all combined with the spinal accessory nerve c – all combined with one intercostal nerve the surgery. The aim of this study was to analyze the results patients, and in the remaining cases nerve transfers using of nerve transfers in patients with traction injuries to the bra- these collateral branches were combined with the spinal ac- chial plexus using the thoracodorsal and medial pectoral cessory or intercostal nerve transfers. The choice of donor nerves as donors. and recipient nerve was based predominantly on the possi- bility for a direct nerve anastomosis. In seven nerve transfers Methods we combined the thoracodorsal nerve with the subscapular or long thoracic nerves, and in another four transfers with the During the past 30 years, since January 1980, we per- intercostal nerves. In eight nerve transfers the medial pecto- formed nerve transfer using collateral branches of the bra- ral nerve was combined with the spinal accessory or inter- chial plexus as donors in 44 patients with upper palsy due to costal nerves. The main reason for these combinations was traction injury. The number of followed up patients was 40, completion of the suture line in cases with recipient nerves of or more precisely 33 with nerve transfers using the medial considerably larger diameter. pectoral nerve, and 29 using the thoracodorsal nerve as do- The medial pectoral nerve, either by itself or in combi- nor. Both nerves were used simultaneoulsy in 22 of the fol- nation with a branch of pectoral ansa, or its two terminal lowed up patients. The