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Brito da Silva H, Midha R. Editorial. Distal end-to-side motor transfer to augment ulnar nerve entrapment surgery at elbow. J Neurosurg 2022; 136:840-842. [PMID: 34479208 DOI: 10.3171/2021.2.jns21291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Harley Brito da Silva
- 1Department of Clinical Neurosciences, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Rajiv Midha
- 1Department of Clinical Neurosciences, Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Alberta, Canada
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Ding W, Jiang J, Xu L. Experimental Study of Nerve Transfer to Restore Diaphragm Function. World Neurosurg 2020; 137:e75-e82. [PMID: 31982596 DOI: 10.1016/j.wneu.2020.01.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 01/31/2023]
Abstract
BACKGROUND Diaphragmatic paralysis after phrenic nerve injury is an infrequent but serious condition. The destruction of respiratory function after unilateral phrenic nerve injury has been the subject of many investigations. METHODS In this study, we used a rat model of complete paralysis of the unilateral diaphragm to observe changes in pulmonary function. RESULTS We found in young rats with complete paralysis of the unilateral diaphragm, the vital capacity and total lung capacity show compensation after 4 weeks, and contralateral phrenic nerve transfer can enhance pulmonary function. However, in the aged rats, respiratory function parameters do not show compensation until 16 weeks after injury. CONCLUSIONS These findings suggest that contralateral phrenic nerve end-to-side anastomosis is a promising therapeutic strategy. In general, our results suggest that this surgical method may hold great potential to be a secure, feasible, and effective technique to rescue diaphragmatic function.
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Affiliation(s)
- Wei Ding
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth Peoples' Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Junjian Jiang
- Department of Hand Surgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Lei Xu
- Department of Hand Surgery, Huashan Hospital, Fudan University, Shanghai, China.
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Geuna S, Papalia I, Ronchi G, d'Alcontres FS, Natsis K, Papadopulos NA, Colonna MR. The reasons for end-to-side coaptation: how does lateral axon sprouting work? Neural Regen Res 2017; 12:529-533. [PMID: 28553322 PMCID: PMC5436340 DOI: 10.4103/1673-5374.205081] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Nerve fibers are attracted by sutureless end-to-side nerve coaptation into the recipient nerve. Opening a window in the epineurium enhances axon attraction and myelination. The authors analyze the features of nerve repair by end-to-side coaptation. They highlight the known mechanisms of axon sprouting and different hypotheses of start up signals (presence or absence of an epineurial window, role of Schwann cells, signaling from the distal trunk). The clinical literature is also presented and differences between experimental and clinical applications are pointed out. The authors propose their point of view and perspectives deriving from recent experimental and clinical experiences.
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Affiliation(s)
- Stefano Geuna
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | - Igor Papalia
- Department of Biomedical and Dental Sciences and Morphological and Functional Sciences, University of Messina, Messina, Italy
| | - Giulia Ronchi
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | - Francesco Stagno d'Alcontres
- Department of Human Pathology of the Adults, the Children and the Adolescents, University of Messina, Messina, Italy
| | - Konstantinos Natsis
- Department of Anatomy, Faculty of Health Sciences, School of Medicine, Aristoteles University, Thessaloniki, Greece
| | - Nikolaos A Papadopulos
- Department of Plastic Surgery and Burns, Alexandroupoli University General Hospital, Democritus University of Thrace, Alexandroupoli, Greece
| | - Michele R Colonna
- Department of Human Pathology of the Adults, the Children and the Adolescents, University of Messina, Messina, Italy
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Comparison of Peripheral Nerve Regeneration with Side-to-side, End-to-side, and End-to-end Repairs: An Experimental Study. PLASTIC AND RECONSTRUCTIVE SURGERY-GLOBAL OPEN 2016; 4:e1179. [PMID: 28293523 PMCID: PMC5222668 DOI: 10.1097/gox.0000000000001179] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 10/25/2016] [Indexed: 11/26/2022]
Abstract
Background: The present study was conducted to find out a tool to enable improved functional recovery with proximal nerve injury. In this experimental study, nerve regeneration was compared between side-to-side (STS), end-to-side (ETS), and end-to-end repairs. Methods: The walk track analysis was used as an outcome of functional recovery. Nerve regeneration was studied with morphometry and histology 6 or 26 weeks postoperatively. Results: All 3 repair techniques showed regeneration of the nerve. From 12 weeks onward, the functional results of the 3 intervention groups were significantly better compared with the unrepaired control group. End-to-end repair was significantly better when compared with the STS and ETS groups. At 26 weeks, the functional and morphometric results and histologic findings did not differ between the STS and ETS groups. The functional results correlated with the morphometric findings in all groups. Conclusions: STS neurorrhaphy showed nerve regeneration, and the end results did not differ from clinically widely used ETS repair. Further studies are warranted to optimize the neurorrhaphy technique and examine possible applications of STS repair in peripheral nerve surgery.
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Novel Atraumatic End-to-Side Repair Model Exhibits Robust Collateral Sprouting Independent of Donor Fiber Injury. Plast Reconstr Surg 2016; 137:523-533. [PMID: 26818287 DOI: 10.1097/01.prs.0000475764.76278.eb] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND A central issue underlying end-to-side neurorrhaphy technique is whether injury to the donor nerve fibers is necessary for successful reinnervation of the recipient nerve. To address this question, the authors developed a novel atraumatic end-to-side neurorrhaphy model that uses the preexisting anatomical structure of the median nerve as the Y-chamber to study the mechanism of collateral sprouting. METHODS In this rat forelimb model, the authors transected the musculocutaneous nerve and the lateral head of the median nerve, and coapted their distal stumps together. In this model, the authors use the medial head of the median nerve as the donor nerve, and the lateral head of the median nerve (distal stump) as a Y-shaped chamber, which provided structural connection to the recipient musculocutaneous nerve in end-to-side fashion. RESULTS Three months after surgery, converging histologic, electrophysiologic, and behavioral observations confirmed the successful reinnervation of the recipient nerve. Retrograde labeling indicated that sensory fibers exhibited greater collateral sprouting than observed for motor fibers. Interestingly, fluorescence of these collateral sprouting fibers was present only when the median nerve lateral head was attached to the musculocutaneous nerve of the biceps, indicating that factors derived from the denervated tissue likely induced the collateral sprouting in this model. CONCLUSIONS The authors' findings provide strong evidence that collateral sprouting can be robustly initiated independent of donor nerve fiber injury. The authors' model can accelerate the understanding of the mechanism underlying end-to-side neurorrhaphy and the optimization of its clinical use.
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Papalia I, Magaudda L, Righi M, Ronchi G, Viano N, Geuna S, Colonna MR. Epineurial Window Is More Efficient in Attracting Axons than Simple Coaptation in a Sutureless (Cyanoacrylate-Bound) Model of End-to-Side Nerve Repair in the Rat Upper Limb: Functional and Morphometric Evidences and Review of the Literature. PLoS One 2016; 11:e0148443. [PMID: 26872263 PMCID: PMC4752340 DOI: 10.1371/journal.pone.0148443] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 01/18/2016] [Indexed: 12/27/2022] Open
Abstract
End-to-side nerve coaptation brings regenerating axons from the donor to the recipient nerve. Several techniques have been used to perform coaptation: microsurgical sutures with and without opening a window into the epi(peri)neurial connective tissue; among these, window techniques have been proven more effective in inducing axonal regeneration. The authors developed a sutureless model of end-to-side coaptation in the rat upper limb. In 19 adult Wistar rats, the median and the ulnar nerves of the left arm were approached from the axillary region, the median nerve transected and the proximal stump sutured to the pectoral muscle to prevent regeneration. Animals were then randomly divided in two experimental groups (7 animals each, 5 animals acting as control): Group 1: the distal stump of the transected median nerve was fixed to the ulnar nerve by applying cyanoacrylate solution; Group 2: a small epineurial window was opened into the epineurium of the ulnar nerve, caring to avoid damage to the nerve fibres; the distal stump of the transected median nerve was then fixed to the ulnar nerve by applying cyanoacrylate solution. The grasping test for functional evaluation was repeated every 10-11 weeks starting from week-15, up to the sacrifice (week 36). At week 36, the animals were sacrificed and the regenerated nerves harvested and processed for morphological investigations (high-resolution light microscopy as well as stereological and morphometrical analysis). This study shows that a) cyanoacrylate in end-to-side coaptation produces scarless axon regeneration without toxic effects; b) axonal regeneration and myelination occur even without opening an epineurial window, but c) the window is related to a larger number of regenerating fibres, especially myelinated and mature, and better functional outcomes.
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Affiliation(s)
- Igor Papalia
- Department of Biomedical Sciences and Morphological and Functional Images, University of Messina, Messina, Italy
| | - Ludovico Magaudda
- Department of Biomedical Sciences and Morphological and Functional Images, University of Messina, Messina, Italy
| | - Maria Righi
- Department of Biomedical Sciences and Morphological and Functional Images, University of Messina, Messina, Italy
| | - Giulia Ronchi
- Department of Clinical and Biological Sciences, University of Torino, Orbassano (Torino), Italy
- Neuroscience Institute of the “Cavalieri Ottolenghi” Foundation (NICO), University of Torino, Orbassano (Torino), Italy
| | - Nicoletta Viano
- Department of Clinical and Biological Sciences, University of Torino, Orbassano (Torino), Italy
| | - Stefano Geuna
- Department of Clinical and Biological Sciences, University of Torino, Orbassano (Torino), Italy
- Neuroscience Institute of the “Cavalieri Ottolenghi” Foundation (NICO), University of Torino, Orbassano (Torino), Italy
- * E-mail:
| | - Michele Rosario Colonna
- Department of Experimental and Clinical Surgical and Medical Specialties, University of Messina, Messina, Italy
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Clinical applications of end-to-side neurorrhaphy: an update. BIOMED RESEARCH INTERNATIONAL 2014; 2014:646128. [PMID: 25136607 PMCID: PMC4127263 DOI: 10.1155/2014/646128] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Revised: 05/14/2014] [Accepted: 07/07/2014] [Indexed: 01/16/2023]
Abstract
End-to-side neurorrhaphy constitutes an interesting option to regain nerve function after damage in selected cases, in which conventional techniques are not feasible. In the last twenty years, many experimental and clinical studies have been conducted in order to understand the biological mechanisms and to test the effectiveness of this technique, with contrasting results. In this updated review, we consider the state of the art about end-to-side coaptation, focusing on all the current clinical applications, such as sensory and mixed nerve repair, treatment of facial palsy, and brachial plexus injuries and painful neuromas management.
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Blocking the P2X7 receptor improves outcomes after axonal fusion. J Surg Res 2013; 184:705-13. [PMID: 23731685 DOI: 10.1016/j.jss.2013.04.082] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2013] [Revised: 04/25/2013] [Accepted: 04/30/2013] [Indexed: 11/21/2022]
Abstract
BACKGROUND Activation of the P2X7 receptor on peripheral neurons causes the formation of pannexin pores, which allows the influx of calcium across the cell membrane. Polyethylene glycol (PEG) and methylene blue have previously been shown to delay Wallerian degeneration if applied during microsuture repair of the severed nerve. Our hypothesis is that by modulating calcium influx via the P2X7 receptor pathway, we could improve PEG-based axonal repair. The P2X7 receptor can be stimulated or inhibited using bz adenosine triphosphate (bzATP) or brilliant blue (FCF), respectively. METHODS A single incision rat sciatic nerve injury model was used. The defect was repaired using a previously described PEG methylene blue fusion protocol. Experimental animals were treated with 100 μL of 100 μM FCF solution (n = 8) or 100 μL of a 30 μM bzATP solution (n = 6). Control animals received no FCF, bzATP, or PEG. Compound action potentials were recorded prior to transection (baseline), immediately after repair, and 21 d postoperatively. Animals underwent behavioral testing 3, 7, 14, and 21 d postoperatively. After sacrifice, nerves were fixed, sectioned, and immunostained to allow for counting of total axons. RESULTS Rats treated with FCF showed an improvement compared with control at all time points (n = 8) (P = 0.047, 0.044, 0.014, and 0.0059, respectively). A statistical difference was also shown between FCF and bzATP at d 7 (P < 0.05), but not shown with d 3, 14, and 21 (P > 0.05). CONCLUSIONS Blocking the P2X7 receptor improves functional outcomes after PEG-mediated axonal fusion.
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Sur YJ, Lee JS, Song SW. Comparison of the effects of subcutaneous anterior transposition and in situ decompression on the histologic and electrophysiologic properties of the ulnar nerve: an experimental study in a rabbit model. J Hand Surg Am 2013; 38:660-5. [PMID: 23474165 DOI: 10.1016/j.jhsa.2012.12.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 12/15/2012] [Accepted: 12/18/2012] [Indexed: 02/02/2023]
Abstract
PURPOSE Although anterior transposition of the ulnar nerve is a commonly performed procedure for treatment of cubital tunnel syndrome, there are concerns that surgical mobilization puts blood supply to the nerve at risk. The purpose of this study was to compare the effects of subcutaneous anterior transposition (SAT) and in situ decompression (ISD) on the ulnar nerve's histologic and electrophysiologic properties in a rabbit model. METHODS We assigned 30 male, young adult New Zealand white rabbits to 1 of 3 groups (each group, n = 10). The extensive dissection-SAT group underwent complete neurolysis of the right ulnar nerve from brachial plexus to wrist and a subsequent SAT, the ISD group underwent ISD with 4-cm-long exposure of the ulnar nerve, and the SAT group underwent SAT with 4-cm-long circumferential neurolysis of the ulnar nerve. We killed the animals 7 days after the operation. We assessed electrophysiologic changes by finding the percentage of compound motor action potential of the surgical limb compared with the contralateral limb, and histologic changes by ischemic fiber degeneration. RESULTS The extensive dissection-SAT group showed a significantly lower percentage of compound motor action potential and higher grade of ischemic fiber degeneration than the ISD and SAT groups. On the other hand, the percentage of compound motor action potential and the grade of ischemic fiber degeneration were similar between the latter 2 groups without a statistically significant difference. CONCLUSIONS This study demonstrated that surgical mobilization of the ulnar nerve during SAT has an effect similar to ISD on the nerve's histologic and electrophysiologic properties at the 7th postoperative day in a rabbit model. CLINICAL RELEVANCE In a rabbit model, ISD and SAT appear to affect histologic and electrophysiologic findings of the ulnar nerve equally at postoperative day 7, which suggests that they would have the same relative safety in a clinical setting.
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Affiliation(s)
- Yoo Joon Sur
- Department of Orthopedic Surgery and Rehabilitation Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Mavrogenis AF, Pavlakis K, Stamatoukou A, Papagelopoulos PJ, Theoharis S, Zetahang Z, Soucacos PN, Zoubos AB. Intraneural OX7-saporin for neuroma-in-continuity in a rat model. EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY 2013; 23:263-72. [PMID: 23412299 DOI: 10.1007/s00590-012-0996-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2012] [Accepted: 04/03/2012] [Indexed: 11/29/2022]
Abstract
We employed 54 rats to devise a model of neuroma-in-continuity and explore the effect of the immunotoxin OX7-saporin on the neuroma. The left common peroneal, tibial or sciatic nerves were crushed by one 10-s application of a micro-artery forceps. At 3 and 6 weeks, the nerve was cut distal to the site of nerve crush, and retrograde fluorescent labeling was done. Pressure microinjection of 2 μl of natural saline or 2 μl of the immunotoxin conjugate OX7-saporin was done at the nerve stump 2 days later. Sacrifice was done after 3 weeks. In all control and saline-injection nerve specimens, gross observation and histology showed a neuroma-in-continuity. In 19 of the 24 OX7-saporin nerve specimens, gross observation showed a narrowed area at the site of nerve crush. Histology showed inhibition of neuroma-in-continuity formation. Fluorescent microscopy showed ablation of the labeled neurons in the dorsal root ganglia corresponding to the OX7-saporin subgroups.
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Affiliation(s)
- Andreas F Mavrogenis
- First Department of Orthopaedics, Athens University Medical School, 41 Ventouri Street, Holargos, Athens, Greece.
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Kettle SJA, Starritt NE, Glasby MA, Hems TEJ. End-to-side nerve repair in a large animal model: how does it compare with conventional methods of nerve repair? J Hand Surg Eur Vol 2013; 38:192-202. [PMID: 22570321 DOI: 10.1177/1753193412445119] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A large animal (sheep) model was used to compare nerve axon regeneration and return of muscle function after a median-to-ulnar nerve end-to-side neurorrhaphy technique with conventional, clinically established, methods of nerve repair and untreated controls. Three groups of sheep were allocated to end-to-side repair (12 animals), a conventional method of nerve repair (18 animals), or a control group (eight animals). After a year nerve repairs were assessed electrophysiologically and histologically, and the muscles supplied by the repaired nerves were assessed physiologically. There were no significant differences in the outcomes of nerve repair between different conventional techniques. Half of the end-to-side nerve repairs supported nerve regeneration. The functional outcomes of the end-to-side repairs were inferior to conventional techniques which were, in turn, inferior to controls. End-to-side neurorrhaphy supported nerve regeneration, but the reliability of this technique is called into question and its use as a clinical tool can only be recommended as a salvage procedure.
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Affiliation(s)
- S J A Kettle
- Peripheral Nerve Research Group, Department of Clinical Neurosciences, University of Edinburgh, Western General Hospital, Edinburgh, UK.
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End-to-end versus end-to-side motor and sensory neurorrhaphy in the repair of the acute muscle denervation. Ann Plast Surg 2012; 67:391-6. [PMID: 21587041 DOI: 10.1097/sap.0b013e3182126816] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND The aim of this study was to experimentally compare end-to-end and end-to-side neurorrhaphy in perineural window model after motor nerve lesion, evaluating which one was the most effective to preserve nerves. Also, differences in motor and sensorial nerve regeneration were tested to verify differences in nerve regeneration. METHODS A total of 20 adult male Wistar rats were randomly assigned to 5 groups, and, in each one, a different treatment was performed: besides the control group, and end-to-end or end-to-side graft with motor or sensorial nerves was performed. Silastic sheet was used as a mechanical barrier to prevent innervation from adjacent nerves. After 16 weeks, the specimens were histologically assessed and wet weight was evaluated as a direct parameter of atrophy. RESULTS The end-to-end neurorrhaphy group presented the best results in terms of mass preservation, but it did not differ significantly from the control group. Motor nerves presented similar results in muscular atrophy. The end-to-side neurorrhaphy group with sensory nerve as donor showed the worst results. CONCLUSIONS The use of sensory nerves to preserve skeletal muscle trophism is not justified, since, according to our model, it affects 50% to 80% of the muscle mass in a period of 16 weeks. End-to-side neurorrhaphy was demonstrated to be an option for re-enervation of a nerve-deprived motor muscle in selected cases.
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Zhu QT, Zhu JK, Chen GY. Location of collateral sprouting of donor nerve following end-to-side neurorrhaphy. Muscle Nerve 2009; 38:1506-1509. [PMID: 18816625 DOI: 10.1002/mus.21116] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Various studies have demonstrated collateral regeneration of the donor nerve following end-to-side neurorrhaphy, but the location of collateral sprouting remains controversial. In a rat end-to-side neurorrhaphy model we isolated nerve fibers from the donor nerve at the neurorrhaphy site utilizing a micro-tease technique. We found that axons sprouted collaterally from a myelinated nerve fiber at the node of Ranvier. Based on this preliminary result we conclude that myelinated nerve fibers could sprout collateral branches at the node of Ranvier at an end-to-side neurorrhaphy site. These findings show that end-to-side neurorrhaphy may be an alternative for peripheral nerve repair.
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Affiliation(s)
- Qing-Tang Zhu
- Division of Microsurgery and Orthopedic Trauma, the First Affiliated Hospital at Sun Yat-Sen University, 58 Zhongsan Er Road, Guangzhou, Guangdong 510080, China.,Orthopedic Surgery Program, California Hospital Medical Center, Los Angeles, California, USA
| | - Jia-Kai Zhu
- Division of Microsurgery and Orthopedic Trauma, the First Affiliated Hospital at Sun Yat-Sen University, 58 Zhongsan Er Road, Guangzhou, Guangdong 510080, China
| | - Gary Y Chen
- Orthopedic Surgery Program, California Hospital Medical Center, Los Angeles, California, USA.,Department of Orthopedic Surgery, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
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Tos P, Artiaco S, Papalia I, Marcoccio I, Geuna S, Battiston B. Chapter 14 End‐to‐Side Nerve Regeneration. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2009; 87:281-94. [DOI: 10.1016/s0074-7742(09)87014-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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