The reconstructive strategy for improving elbow function in late obstetric brachial plexus palsy

Forearm and elbow secondary surgical procedures in neonatal brachial plexus palsy: a systematic scoping review

Background

Neonatal Brachial plexus palsy is an injury during delivery that can lead to loss of motor function and limited range of motion in patients due to damage of nerves in the brachial plexus. This scoping review aims to explore types of procedures performed and assess outcomes of forearm and elbow secondary surgery in pediatric patients.

Methods

Searches of PubMed, Cochrane, Cumulative Index to Nursing and Allied Health Literature, Web of Sciences, and Scopus were completed to obtain studies describing surgical treatment of elbow and forearm in pediatric patients with neonatal Brachial plexus palsy. 865 abstracts and titles were screened by two independent reviewers resulting in 295 full text papers; after applying of inclusion and exclusion criteria 18 articles were included. The level of evidence of this study is level IV.

Results

Ten main procedures were performed to regain function of the forearm and elbow in neonatal brachial plexus birth palsy patients. Procedures had different aims, with supination contracture (6) and elbow flexion restoration (5) being the most prevalent. The variance between preoperative and postoperative soft tissue and bony procedures outcomes decreased and showed improvement with respect to the aim of each procedure category. For soft tissue procedures, a statistically significant increase was found between preoperative and postoperative values for active elbow flexion, passive supination, and active supination. For bony procedures, there was a statistically significant decrease between preoperative and postoperative values of passive and active supination.

Conclusion

Overall, all procedures completed in the assessed articles of this study were successful in their aim. Bony procedures, specifically osteotomies, were found to have a wider range of results, whereas soft tissue procedures were found to be more consistent and reproducible with respect to their outcomes. Bony and soft tissue procedures were found vary in their aims and outcomes. This study indicates the need for further research to augment knowledge about indications and long-term benefits to each procedure.

Staged Phrenic Nerve Elongation and Free Functional Gracilis Muscle Transplantation-A Possible Option for Late Reconstruction in Chronic Brachial Plexus Injury

PURPOSE

In patients with late brachial plexus birth injuries, sequelae after acute flaccid myelitis, or chronic adult brachial plexus injury, donor nerves for functioning muscle transplantation are often scarce. We present the results of a potential strategy using the phrenic nerve with staged free gracilis transplantation for upper extremity reanimation in these scenarios.

METHODS

A retrospective review was performed on an institutional database of brachial plexus injury or patients with palsy. All patients underwent a staged reconstruction in which the ipsilateral phrenic nerve was extended by an autogenous nerve graft (PhNG), followed by free-functioning gracilis transplantation (PhNG-gracilis).

RESULTS

Nine patients (6 cases of late brachial plexus birth injuries, 2 of acute flaccid myelitis, and 1 of adult chronic brachial plexus injury) were included in this study. The median follow-up period following the PhNG-gracilis procedure was 27 months (range, 12-72 months). The goals of the staged PhNG and PhNG-gracilis were primarily finger extension or finger flexion. In some patients, the technique was used to improve both elbow and finger function, tunneling the muscle through the flexor compartment of the upper arm and under the mobile wad at the elbow. All patients exhibited improvement of muscle strength, including in finger extension (4 patients) from M0 to M2; finger flexion (3 patients) from M0 to M3; elbow extension (1 patient) from M0 to M2; and elbow flexion (1 patient) from M2 to M4.

CONCLUSIONS

A 2-stage PhNG-gracilis may restore or enhance the residual elbow and/or finger paralysis in chronic brachial plexus injuries. A minimum follow-up period of 3 years is recommended. This technique may remain useful as one of the last reconstructive options to increase power in patients with scarce donor nerves.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic V.

Resolving Co-Contraction of the Elbow in Patient with Sequelae of Obstetric Brachial Plexus Palsy: A Cohort Study

BACKGROUND

Obstetric brachial plexus palsy can cause deformities of the upper extremity in up to 92% of patients. Elbow reconstruction is difficult because co-contraction of the elbow flexor (EF) and elbow extensor (EE) muscles makes the traditional treatment strategy ineffective. The authors propose a novel strategy to minimize the effect of co-contraction, comprising transfer of an EF to the triceps and a staged gracilis muscle transplantation [functioning free muscle transplantation (FFMT)] to augment EF. The authors hypothesize this will lead to improved elbow flexion and extension, as well as decreased elbow flexion contracture.

METHODS

A single-center retrospective review of patients who received a gracilis FFMT for EF after EF-to-EE transfer was performed. EF/EE strength and range of motion data were collected from the last clinical visit. Patients were excluded if they had fewer than 1.5 years of follow-up. A control group with sequelae of obstetric brachial plexus palsy and nonsurgical treatment was used for comparison.

RESULTS

Twenty-one patients were included. Average age at muscle transfer was 7.6 ± 5.5 years (range, 3 to 22 years) and at gracilis FFMT was 10.4 ± 6.0 years (range, 5 to 26 years). Average follow-up was 7.3 ± 6.5 years (range, 1.5 to 14.8 years). After EF-to-EE transfer, EE strength increased significantly from Medical Research Council grade 2.2 ± 0.4 to 3.4 ± 0.5 ( P < 0.0001) and EF decreased from 3.2 ± 1.1 to 1.1 ± 1.1 ( P < 0.0001) and recovered to grade 3.3 ± 0.7 after gracilis FFMT. EF contracture was significantly lower compared with that in the nonsurgical cohort ( P = 0.029).

CONCLUSION

Patients who undergo EF-to-EE transfer followed by gracilis FFMT have equivalent EF strength with significantly improved EE and improved elbow flexion contracture.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.

Long-Term Results of Microsurgical Brachial Plexus Reconstruction in Late-Presenting Cases of Brachial Plexus Birth Injury

PURPOSE

The role of primary surgery in delayed presenting cases of brachial plexus birth injury is still debated. The purpose of this study was to evaluate the results of brachial plexus reconstruction performed at the age of ≥12 months.

METHODS

Twenty-nine cases were included. Five cases had upper (C5-6) palsy, 4 had upper/middle (C5-7), and 20 had total (C5-8 and T1) palsy.

RESULTS

The age at the time of primary surgery was an average of 15.6 months. The brachial plexus was formally explored and neurolysis, grafting, and neurotization were used in different combinations. Exploration revealed that 27% of the roots were avulsed and 32% were ruptured. The follow-up was an average of 7.9 years. Generally, the best functional recovery was elbow flexion followed by shoulder external rotation. Satisfactory shoulder abduction (≥6 on the Toronto Active Movement Scale [TAMS]) was achieved in 31% of cases. The abduction range was an average of 79° ± 35°; 50° in upper palsy, 103° in upper/middle palsy, and 82° in total palsy. Shoulder external rotation ≥6 on the TAMS was achieved in 62% of cases. External rotation range was an average of 58° ± 29°; 78° in upper palsy, 68° in upper/middle palsy, and 52° in total palsy. Elbow flexion and extension of ≥6 on the TAMS were achieved in 69% and 58% of cases, respectively. Wrist flexion and finger flexion of ≥6 on the TAMS were achieved in 35% and 12.5%, whereas wrist and finger extension of >6 on the TAMS were achieved in 25% and 4% of cases, respectively.

CONCLUSION

In the delayed presentation of brachial plexus birth injury, brachial plexus reconstruction results in good functional recovery of elbow flexion and shoulder external rotation but modest functional recovery of finger flexion and wrist extension. The rate of functional recovery of the elbow flexion was similar following nerve grafting and transfer. Nerve transfer for shoulder external rotation should be considered even in infants with available roots for grafting.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic IV.

Outcomes of Functioning Free Gracilis Muscle Transplantation to Restore Elbow Flexion in Late Brachial Plexus Birth Injury

BACKGROUND

 Restoring elbow function is challenging after late presenting brachial plexus birth injury (BPBI). Free functioning muscle transplantation (FFMT) using the gracilis muscle is a reliable procedure to restore elbow flexion in patients with impaired function after spontaneous recovery or failed surgical reconstruction.

METHODS

 A retrospective review was performed on BPBI patients more than 2 years of age who received a FFMT between January 1993 and January 2018, with the aim of improving elbow flexion as the primary or secondary functional goal. Patients with preoperative elbow flexion Medical Research Council (MRC) grades less than 3 with more than or equal to 18 months of follow-up duration were included in the analysis. Patient demographic information and pre/postoperative clinical parameters including elbow flexion MRC scale, passive elbow range of motion, and complications were recorded. Surgical data including donor nerve choice, site of the FFMT tendon attachment, and necessity of concomitant procedures or reoperation were also analyzed.

RESULTS

 Fifty-six FFMTs were performed for the primary (29 patients) or secondary (26 patients) objective of restoring elbow flexion. The mean age at the time of the procedure was 9.6 years (standard deviation [SD] = 6.29, R = 3-35). Mean follow-up was 7.9 years (SD = 5.2). Elbow flexion improved from a median MRC grade 2 to 4 after a FFMT (p < 0.05). Patients who had a FFMT to restore two functions had 86% lower elbow flexion MRC grades than those who had a FFMT to restore flexion only (p < 0.05). Patients less than 12 years old at the time of surgery had more complications, reoperations, and rates of a flexion contracture more than or equal to 30 degrees than those aged more than 12 years (p < 0.05).

CONCLUSION

 FFMT is a reliable option for upper extremity reanimation. Patients aged less than 12 years old at the time of FFMT had significantly more complications, reoperations, and rates of postoperative elbow flexion contracture more than or equal to 30 degrees, but equivalent elbow flexion MRC grades.

LEVEL OF EVIDENCE

 III.

Palliative shoulder and elbow surgery in obstetrical brachial plexus birth palsy

Palliative surgery in a child with incomplete recovery following obstetric brachial plexus birth palsy (BPBP) is common. Surgical management strategies for BPBP sequelae have the common objectives of decreasing the risk of functional limitations in the long term and improving function. There is no single treatment to deal with the sequelae of BPBP. While there is a myriad of possible clinical presentations, the ages for surgery extend from a 6- to 12-month-old infant to the mature adolescent. Numerous procedures have been described in the literature, ranging from simple soft tissue release to muscular transfers and osteotomies. The indications will depend on a combination of all these factors. In certain cases, an early intervention is recommended to prevent joint deformities, and to allow joint remodeling, often at the shoulder. In other cases, the indications are less clear, thus the expected benefit must be carefully considered. The indications for these operations must meet certain rules to be beneficial for the patient and should only be considered after a comprehensive clinical examination and a commitment from the child and the family to the therapeutic strategy.

Distal Nerve Transfers to the Triceps Brachii Muscle: Surgical Technique and Clinical Outcomes

PURPOSE

To report the clinical outcomes and describe the surgical technique of triceps muscle reinnervation using 2 different distal nerve transfers: the flexor carpi ulnaris (FCU) fascicle of the ulnar nerve and the posterior branch of the axillary nerve (PBAN) to the triceps nerve branch.

METHODS

A retrospective review of patients undergoing FCU fascicle of ulnar nerve or PBAN to triceps nerve branch transfer was performed. Outcome measures included preoperative and postoperative modified British Medical Research Council (MRC) score, EMG results, and complications.

RESULTS

Between September 2003 and April 2017, 6 patients were identified. Four patients with a traumatic upper trunk and posterior cord palsy underwent ulnar nerve fascicle to triceps nerve transfer. Two patients with a recovering upper trunk following a pan-brachial plexus palsy underwent PBAN to triceps nerve branch transfer. The median age was 30.0 years (range, 18-68 years). Surgery was performed at a median of 6.9 months (range, 5.0-8.9 months) postinjury, with a median follow-up of 18.4 months (range, 7.6-176.3) months. Before surgery, 4 patients exhibited grade M0 and 2 patients exhibited grade M1 triceps strength. Four patients had M5 donor muscle strength and 2 had grade M4. Postoperatively, 4 patients regained MRC grade M4 triceps muscle strength, 1 regained M3, and 1 regained M2. There was no noticeable donor muscle weakness.

CONCLUSIONS

Nerve fascicles to the FCU and PBAN are viable options for obtaining meaningful triceps muscle recovery in a select group of patients.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic V.

Prevalence and etiology of elbow flexion contractures in brachial plexus birth injury: A scoping review

PURPOSE

To synthesize the evidence on the prevalence and etiology of elbow flexion contractures secondary to brachial plexus birth injury (BPBI).

METHODS

Using Arksey and O'Malley's scoping review framework, MEDLINE, EMBASE, PsycINFO, and CINAHL databases were searched, followed by a comprehensive grey literature search. Articles and abstracts of studies of all level of evidence on the prevalence, natural history, clinical presentation, etiology, and treatment of elbow flexion contractures in BPBI were included.

RESULTS

Of the 884 records found, 130 full text articles were reviewed, and 57 records were included. The median prevalence of elbow flexion contracture in BPBI was 48%. The magnitude of the contractures was between 5 and 90 degrees. Contractures > 30 degrees were found in 21% to 36% of children. With recent clinical and lab studies, there is stronger evidence that the contractures are largely due to the effects of denervation causing failure in the growth of the affected flexor muscles, while muscle imbalance, splint positioning, and postural preferences play a smaller role.

CONCLUSION

The etiology of elbow flexion contractures is multifaceted. The contribution of growth impairment in the affected muscles offers greater understanding as to why maintaining passive range of motion in these contractures can be difficult.

Treatment of the Open Glenohumeral Joint with the Anterior Deltoid Muscle Flap

Upper extremity reconstruction is most often encountered in trauma patients. Although the rate of complications from elective orthopedic procedures remains relatively low, these complications are oftentimes in the form of open joints or joint infections that can be devastating. Classically, wounds of the shoulder girdle have been treated with large muscles such as the pectoralis major, pectoralis minor, and latissimus dorsi. Flaps more local to the area including the deltoid muscle flap have been overlooked due to their small size. Despite its size, the anterior deltoid can be used for shoulder girdle reconstruction with minimal functional deficit and allows for reconstruction of the glenohumeral joint without sacrifice of the larger muscles of the upper trunk. This study reports a case of a chronic shoulder girdle wound and successful management with the use of an anterior deltoid muscle flap.

Brachialis Muscle Transfer to the Forearm Muscles in Obstetric Brachial Plexus Palsy

Tendon transfers are frequently needed to improve hand function in obstetric brachial plexus injuries. The reconstruction cannot always be achieved using local donor transfers in the forearm as these are not always available. In such cases, we propose the use of the brachialis muscle as a useful donor for transfer. Five adolescents with obstetric brachial plexus palsy were operated on to reconstruct wrist extension and/or pronation using the brachialis muscle transfer to the pronator teres ( n = 1) extensor carpi radialis brevis ( n = 1) and extensor carpi radialis longus ( n = 3). Twelve months after surgery, average active motion recovery was 20° for wrist extension and 14° for pronation. Active and passive range of motion was similar.

Neurotization of free gracilis transfer with the brachialis branch of the musculocutaneous nerve to restore finger and thumb flexion in lower trunk brachial plexus injury: an anatomical study and case report

OBJECTIVE

To investigate the feasibility of using free gracilis muscle transfer along with the brachialis muscle branch of the musculocutaneous nerve to restore finger and thumb flexion in lower trunk brachial plexus injury according to an anatomical study and a case report.

METHODS

Thirty formalin-fixed upper extremities from 15 adult cadavers were used in this study. The distance from the point at which the brachialis muscle branch of the musculocutaneous nerve originates to the midpoint of the humeral condylar was measured, as well as the length, diameter, course and branch type of the brachialis muscle branch of the musculocutaneous nerve. An 18-year-old male who sustained an injury to the left brachial plexus underwent free gracilis transfer using the brachialis muscle branch of the musculocutaneous nerve as the donor nerve to restore finger and thumb flexion. Elbow flexion power and hand grip strength were recorded according to British Medical Research Council standards. Postoperative measures of the total active motion of the fingers were obtained monthly.

RESULTS

The mean length and diameter of the brachialis muscle branch of the musculocutaneous nerve were 52.66±6.45 and 1.39±0.09 mm, respectively, and three branching types were observed. For the patient, the first gracilis contraction occurred during the 4th month. A noticeable improvement was observed in digit flexion one year later; the muscle power was M4, and the total active motion of the fingers was 209°.

CONCLUSIONS

Repairing injury to the lower trunk of the brachial plexus by transferring the brachialis muscle branch of the musculocutaneous nerve to the anterior branch of the obturator nerve using a tension-free direct suture is technically feasible, and the clinical outcome was satisfactory in a single surgical patient.

Postparalysis facial synkinesis: clinical classification and surgical strategies

Supplemental Digital Content is available in the text.

Background:

Postparalysis facial synkinesis (PPFS) can occur after any cause of facial palsy. Current treatments are still inadequate. Surgical intervention, instead of Botox and rehabilitation only, for different degrees of PPFS was proposed.

Methods:

Seventy patients (43 females and 27 males) with PPFS were enrolled since 1986. They were divided into 4 patterns based on quality of smile and severity of synkinesis. Data collection for clinically various presentations was made: pattern I (n = 14) with good smile but synkinesis, pattern II (n = 17) with acceptable smile but dominant synkinesis, pattern III (n = 34) unacceptable smile and dominant synkinesis, and pattern IV (n = 5) poor smile and synkinesis. Surgical interventions were based on patterns of PPFS. Selective myectomy and some cosmetic procedures were performed for pattern I and II patients. Extensive myectomy and neurectomy of the involved muscles and nerves followed by functioning free-muscle transplantation for facial reanimation in 1- or 2-stage procedure were performed for pattern III and many pattern II patients. A classic 2-stage procedure for facial reanimation was performed for pattern IV patients.

Results:

Minor aesthetic procedures provided some help to pattern I patients but did not cure the problem. They all had short follow-up. Most patients in patterns II (14/17, 82%) and III (34/34, 100%) showed a significant improvement of eye and smile appearance and significant decrease in synkinetic movements following the aggressively major surgical intervention. Nearly, all of the patients treated by the authors did not need repeated botulinum toxin A injection nor require a profound rehabilitation program in the follow-up period.

Conclusions:

Treatment of PPFS remains a challenging problem. Major surgical reconstruction showed more promising and long-lasting results than botulinum toxin A and/or rehabilitation on pattern III and II patients.

Free functioning gracilis transplantation for reconstruction of elbow and hand functions in late obstetric brachial plexus palsy

BACKGROUND

In late obstetric brachial plexus palsy (OBPP), restoration of elbow and hand functions is a difficult challenge. The use of free functioning muscle transplantation in late OBPP was very scarcely reported. In this study, we present our experience on the use of free functioning gracilis transfer for restoration of elbow and hand functions in late cases of OBPP.

PATIENTS AND METHODS

Eighteen patients with late OBPP underwent free gracilis transfer for reconstruction of elbow and/or hand functions. The procedure was indicated when there was no evidence of reinnervation on EMG and in the absence of local donors. Average age at surgery was 102.5 months. Patients were evaluated using the British Medical Research Council (MRC) grading system and the Toronto Active Movement Scale. Hand function was evaluated by the Raimondi scoring system.

RESULTS

The average follow-up was 65.8 ± 41.7 months. Contraction of the transferred gracilis started at an average of 4.5 ± 1.03 months. Average range of elbow flexion significantly improved from 30 ± 55.7 to 104 ± 31.6 degrees (P <0.001). Elbow flexion power significantly increased with an average of 3.8 grades (P = 0.000147). Passive elbow range of motion significantly decreased from an average of 147 to 117 degrees (P = 0.003). Active finger flexion significantly improved from 5 ± 8.3 to 63 ± 39.9 degrees (P < 0.001). Finger flexion power significantly increased with an average 2.7 grades (P < 0.001). Only 17% achieved useful hand (grade 3) on Raimondi hand score. Triceps reconstruction resulted in an average of M4 power and 45 degrees elbow extension.

CONCLUSION

Free gracilis transfer may be a useful option for reconstruction of elbow and/or hand functions in late OBPP.

Free functioning gracilis transfer for traumatic brachial plexus injuries in children

PURPOSE

To report our technique and experience with use of free functioning muscle transfer (FFMT) in reconstruction of traumatic brachial plexus injuries (BPIs) in children as well as its complications and outcomes.

METHODS

Twelve patients with complete BPI underwent FFMT for reconstruction between 2000 and 2012. Eight had single-stage gracilis transfer for restoration of elbow flexion, and 4 children had double free gracilis muscle transfer for restoration of elbow flexion and prehension. Mean duration of follow-up was 27 months (range, 14-55 mo).

RESULTS

Eleven out of 12 patients achieved at least M3 elbow flexion, with 8 patients achieving M4 or greater elbow flexion. Eight of 12 patients had nerve transfers to the musculocutaneous nerve. Mean active elbow arc of motion was 79° (range, 30°-130°). Two patients aged 8 and 11 years with open growth plates developed elbow joint contractures, which limited range of motion, but they recovered M4 and M5 elbow flexion strength.

CONCLUSIONS

FFMTs can result in good outcomes following reconstruction for traumatic BPI. The use of FFMT should be carefully considered in children prior to skeletal maturity because of the risk of the development of an elbow flexion contracture.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic IV.

Obstetrical brachial plexus injuries: late functional results of the Steindler procedure

We reviewed late functional results of a modified Steindler procedure in patients with obstetrical brachial plexus palsy and poor active elbow flexion. From 1982 to 2005, we reviewed final functional results and complications of 27 cases with flexion weakness of the elbow secondary to obstetrical brachial plexus injury, treated with a modified Steindler procedure. At the end of the follow-up, the mean active elbow flexion was 97° and the mean extensor lag was 10°. In the long-term follow-up, the modified Steindler procedure maintained good results in 67% of the cases in our series, and this percentage raised by 82% when the wrist extensor was present or restored before the Steindler procedure. There were poor results in 19% of the patients, but no major complications.

Contribution of denervated muscle to contractures after neonatal brachial plexus injury: not just muscle fibrosis

INTRODUCTION

We investigated the contribution of muscle fibrosis to elbow flexion contractures in a murine model of neonatal brachial plexus injury (NBPI).

METHODS

Four weeks after NBPI, biceps and brachialis fibrosis were assessed histologically and compared with the timing of contracture development and the relative contribution of each muscle to contractures. Modulus of elasticity and hydroxyproline (collagen) content were measured and correlated with contracture severity. The effect of halofuginone antifibrotic therapy on fibrosis and contractures was investigated.

RESULTS

Elbow contractures preceded muscle fibrosis development. The brachialis was less fibrotic than the biceps, yet contributed more to contractures. Modulus and hydroxyproline content increased in both elbow flexors, but neither correlated with contracture severity. Halofuginone reduced biceps fibrosis but did not reduce contracture severity.

CONCLUSIONS

Contractures after NBPI cannot be explained solely by muscle fibrosis, arguing for investigation of alternate pathophysiologic targets for contracture prevention and treatment.

Posterior branch of the axillary nerve transfer to the lateral triceps branch for restoration of elbow extension: case report

We report a nerve transfer to the triceps using the posterior branch of the axillary nerve to restore elbow extension in an 18-year-old woman with a C7-T1 injury. Elbow extension strength improved from M0 to M4, whereas deltoid strength was minimally affected. Her Disabilities of the Arm, Shoulder and Hand score improved 14 points. This method may be considered for restoring triceps function in lower pattern brachial plexus injury.

Brachialis muscle transfer to the forearm for the treatment of deformities in spastic cerebral palsy

The use of the brachialis muscle for tendon transfers in cerebral palsy has not been described previously. In this study, the brachialis muscle was used for transfer in 11 patients with spastic cerebral palsy for the restoration of forearm supination, wrist extension, or finger extension. Four patients underwent brachialis rerouting supinatorplasty. Active supination increased in two (60° and 50°), minimally increased in one (5°), and did not change in one patient. Five patients had a brachialis to extensor carpi radialis brevis transfer. The mean gain in postoperative active wrist extension was 65°. Two patients with finger flexion deformity and no active metacarpophalangeal joint movement underwent a brachialis to extensor digitorum communis transfer, and they attained an improved posture of finger extension although their postoperative metacarpophalangeal flexion-extension movement arc was 5° and 25°. None of the patients developed any loss of active flexion at the elbow. Our preliminary experience suggests that the brachialis muscle may serve as an alternative tendon transfer in cerebral palsy.

Transfer of nerve branch to the brachialis to reconstruct elbow extension in incomplete tetraplegia: case report

We undertook a brachialis to triceps nerve transfer to restore elbow extension in a 53-year-old man 5 months after he sustained a spine injury that resulted in a central cord syndrome. Within 3 months of surgery, the patient had recovered active elbow extension and had M3 level strength, which increased to M4 and 5 kg of strength by 12 months postoperatively. Despite transferring an antagonist nerve for triceps reinnervation, the patient had no problems controlling active elbow flexion-extension. Harvesting the brachialis nerve caused no permanent decrease in elbow flexion strength.

The effects of denervation, reinnervation, and muscle imbalance on functional muscle length and elbow flexion contracture following neonatal brachial plexus injury

The pathophysiology of paradoxical elbow flexion contractures following neonatal brachial plexus injury (NBPI) is incompletely understood. The current study tests the hypothesis that this contracture occurs by denervation-induced impairment of elbow flexor muscle growth. Unilateral forelimb paralysis was created in mice in four neonatal (5-day-old) BPI groups (C5-6 excision, C5-6 neurotomy, C5-6 neurotomy/repair, and C5-T1 global excision), one non-neonatal BPI group (28-day-old C5-6 excision), and two neonatal muscle imbalance groups (triceps tenotomy ± C5-6 excision). Four weeks post-operatively, motor function, elbow range of motion, and biceps/brachialis functional lengths were assessed. Musculocutaneous nerve (MCN) denervation and reinnervation were assessed immunohistochemically. Elbow flexion motor recovery and elbow flexion contractures varied inversely among the neonatal BPI groups. Contracture severity correlated with biceps/brachialis shortening and MCN denervation (relative axon loss), with no contractures occurring in mice with MCN reinnervation (presence of growth cones). No contractures or biceps/brachialis shortening occurred following non-neonatal BPI, regardless of denervation or reinnervation. Neonatal triceps tenotomy did not cause contractures or biceps/brachialis shortening, nor did it worsen those following neonatal C5-6 excision. Denervation-induced functional shortening of elbow flexor muscles leads to variable elbow flexion contractures depending on the degree, permanence, and timing of denervation, independent of muscle imbalance.

Microsurgery of the upper extremity

In the past 50 years, hand surgeons have made considerable contributions to microsurgery. The unique demands of complex upper extremity care have driven many of the technical and scientific advances of this discipline, including functional muscle transfers, nerve transfers, and composite tissue allotransplantation. The purpose of this article was to review the current applications of microsurgery to the upper extremity.

Phrenic nerve transfer for elbow flexion and intercostal nerve transfer for elbow extension

PURPOSE

To explore long-term recovery of elbow flexion and extension after transferring the phrenic nerve and intercostal nerves, respectively, in adults with global brachial plexus avulsion injuries.

METHODS

Seven adults with global brachial plexus avulsion injuries had the phrenic nerve transferred to the musculocutaneous nerve (or to the anterior division of upper trunk) and intercostal nerves transferred to the triceps branch of the radial nerve at our hospital 7 to 12 years ago. The results of elbow motor strength testing using the Medical Research Council grading scale, and electrodiagnostic findings using electromyogram examinations, were studied retrospectively. Pulmonary function tests were also performed at final visits.

RESULTS

Functional elbow flexion was obtained in most of the 7 cases (M2, 1; M3, 3; M4, 2; and M5, 1) but elbow extension was absent or insufficient in all subjects (M0, 1; M1, 3; and M2, 3). Electrical results showed successful biceps reinnervation in 6 patients and successful triceps reinnervation in 5. No patient experienced breathing problems, and pulmonary function results were within normal range.

CONCLUSIONS

In the long term, after brachial plexus avulsion injury in most patients who underwent both phrenic nerve and intercostal nerve transfer to achieve elbow flexion and extension eventually obtained satisfactory elbow flexion but poor elbow extension. We recommend against transferring the intercostal nerves to the triceps branch of radial nerve in conjunction with primary phrenic to musculocutaneous nerve transfer.

TYPE OF STUDY/LEVEL OF EVIDENCE

Therapeutic IV.

Correction of elbow flexion contracture in late obstetric brachial plexus palsy through arthrodiatasis of the elbow (Ioannina method)

Inadequate elbow extension is a recognized sequela after obstetric brachial plexus injury because of muscle imbalance and adversely affects the ability to perform sufficiently most daily living activities. The various methods that have been used to correct this deformity do not offer a satisfactory outcome in the long term and show a tendency for gradual recurrence. We present a new technique of a closed gradual arthrodiatasis using a unilateral hinged elbow external fixator. The technique was applied in 10 patients with elbow flexion contracture as a sequela of brachial plexus birth palsy. Loss of elbow extension measured 55 degrees at average. With a mean device application of 8.8 weeks all patients gained full elbow extension. No major complications were noted. All patients were satisfied with the outcome. This novel technique (closed gradual arthrodiatasis of the elbow joint) has a definite role in the treatment of elbow flexion contracture in late cases of obstetric palsy, given the otherwise limited surgical options.

Secondary procedures for elbow flexion restoration in late obstetric brachial plexus palsy

Even though total absence of elbow flexion in obstetric brachial plexus palsy (OBPP) is rare, weakness is a frequent problem. Numerous procedures for elbow flexion restoration in late obstetric brachial plexus palsy have been described. In this study, children with OBPP who underwent secondary reconstruction for elbow flexion restoration were studied. A retrospective review of 15 patients (16 elbows) who underwent 16 pedicled and eight free-muscle transfers for elbow flexion restoration was conducted. The mean follow-up period was 8.4 ± 2.9 years (range, 25 months to 12.2 years). The mean age at operation (elbow surgery) was 5.4 ± 1.9 years. The total arc of elbow motion was the result of the active elbow flexion less the flexion contracture. There was significant improvement in biceps muscle power from an average grading of 2.49 ± 0.80 preoperatively to 3.64 ± 0.46 postoperatively (p < 0.001). Thirteen of 16 elbows (81%) achieved good and excellent results (≥M3+); and three elbows (19%) fair results (M3- or M3). The average arc of motion was significantly improved from 36° ± 25° preoperatively to 94° ± 26° postoperatively (p < 0.001). The preoperative and postoperative average elbow flexion contracture was 10.9° ± 8.9° and 20° ± 12.2°, respectively. Pedicled and/or free-muscle transfers can significantly improve elbow flexion in late obstetric brachial plexus palsy. Choice of the procedure should be individualized and determined on the basis of the type of paralysis, availability of donor muscles, previous reconstruction, and experience of the surgeon.

Free Muscle Transfer in Posttraumatic Plexopathies Part II: The Elbow

The indications for free muscle transfer in brachial plexopathies are prolonged denervation time or inadequate upper extremity function after primary nerve reconstruction. The purpose of this study is to analyze the outcomes of free muscle transfer for elbow flexion and extension in brachial plexopathies in relation to the different muscles used and the respective motor donors. Seventy-three muscles were transferred for elbow flexion and ten for elbow extension. Latissimus dorsi (LD) was used in 37 cases, gracilis in 28, rectus femoris (RF) in seven, and vastus lateralis in one. Five LD and five gracilis were transferred for elbow extension. Patients younger than 15 years yielded better results than older patients for elbow flexion. When LD was transferred, the mean muscle grading (MG) was 3.33 ± 0.25 when the neurotization was from intercostals; these outcomes were statistically significant when compared with outcomes of free gracilis transfer (MG 2.25 ± 0.6). There was also a statistically significant difference when free LD was neurotized with three intercostals as compared with two intercostals nerves. RF yielded also good results when neurotized from contralateral C7 (cC7; MG 3.67 ± 0.6). For elbow extension, the better outcomes of LD were not statistically significant. Among all the free muscle transfers for upper extremity reconstruction, elbow reanimation yielded the most rewarding outcomes. The selection of powerful muscle units was more important than the effect of neurotization which was not as strong as it was in muscle transfers for facial or hand reanimation.

Elbow flexion after primary reconstruction in obstetric brachial plexus palsy

Fifty-two children (54 upper extremities) with obstetric brachial plexus palsy who underwent primary reconstruction for elbow flexion restoration were studied. The outcomes were analysed in relation to the type of brachial plexus lesion, timing of surgery, and the type of reconstruction. Overall, 42 of 54 extremities (78%) achieved good and excellent results (> or =M3+). The average postoperative muscle grading for the biceps was 3.7 (SD 0.8), and the average postoperative active elbow flexion was 108 degrees (SD 33 degrees ). The average elbow flexion contracture was 18 degrees (SD 21 degrees ). The timing of surgery and the type of the brachial plexus injury significantly influenced the final outcome. The best results were seen in early cases (< or =3 months), where the lateral cord was reconstructed from intraplexus donors. In this group, minimal flexion contracture deformity was observed. Late reconstruction (> or =7 months) of the musculocutaneous nerve resulted in inferior results.

Restoration of elbow function in severe brachial plexus paralysis via muscle transfers

Reconstruction of elbow function in severe or late brachial plexus injuries represents a challenge to the reconstructive microsurgeons. The current sophisticated techniques of nerve reconstruction in combination with secondary local or free functional muscle transfers, may offer satisfactory outcome. Latissimus dorsi can be transferred as a pedicled or free muscle to restore elbow function. We present our experience with elbow reanimation in late cases of brachial plexus paralysis utilising latissimus dorsi muscle transfer. From 1998 to 2006 we operated 103 patients with brachial plexus paralysis. Amongst these patients, 21 were late cases and underwent latissimus dorsi muscle transfer for elbow reanimation. Ten patients had free latissimus dorsi transfer for elbow flexion. Free latissimus dorsi muscle was neurotised either directly via three intercostals in three patients or with a nerve transfer procedure using the contralateral seventh cervical nerve root in seven patients. Care was taken to maintain the proper tension to the muscle, which must hold the elbow in static flexion of about 120 degrees at the end of the procedure. Powerful elbow flexion (M4-M4+) or extension (M4) was obtained after the first 3 months in all patients who had an ipsilateral pedicled latissimus dorsi transfer. In the group of free muscle transfers, elbow flexion was seen after 6-8 months. After the initiation of muscle contraction, eight of the patients regained elbow flexion of M3-M4+. Latissimus dorsi muscle transfer is a reliable method for elbow reanimation. Appropriate postoperative management is also an important factor to obtain better outcome.

Surgical Strategies for Brachial Plexus Polio-Like Paralysis

BACKGROUND

Brachial plexus polio-like paralysis is an acute flaccid paralysis of the upper limb following viral infection. Surgical approaches to the paralytic limb have not previously been discussed in the literature. This study is the first to describe the clinical course and propose a surgical strategy for disabilities related to poliomyelitis-like paralysis.

METHODS

Between 1982 and 2004, 17 patients (11 boys and six girls) presented with acute flaccid paralysis of the upper limb. Their clinical course was reviewed retrospectively. Average age at onset of disease was 2 years (range, 4 months to 13 years). All patients had disability in shoulder abduction and/or elbow flexion. Ten patients underwent reconstructive surgery.

RESULTS

Stage V shoulder abduction (>160 degrees) according to Gilbert's classification was regained in five patients who underwent nerve transfer within 1 year of paralysis. One patient treated by nerve transfer after 3 years of paralysis obtained only stage I abduction (<45 degrees). In two patients, multiple local muscle transfers were performed for the shoulder abduction disability, resulting in mild improvement from stage I to stage II abduction (<90 degrees). In four patients, functioning free muscle transplantation for elbow flexion was carried out, and all regained functional M4 muscle strength. Of seven patients in the nonsurgical group, two had complete spontaneous recovery within 1 year, but five had permanent residual limb paralysis at a mean follow-up of 10 years.

CONCLUSIONS

Surgical strategies, including nerve transfer for shoulder abduction deficit within 1 year after attack and functioning free muscle transplantation for the elbow flexion deficit in the late period, should be considered for this disease. Late reconstruction, either by nerve transfer or by using local multiple muscle transfer for shoulder abduction, is ineffective.

Secondary reanimation procedures in late obstetrical brachial plexus palsy patients

The varying degrees of spontaneous reinnervation that occur in untreated obstetrical brachial plexus palsy leave characteristic deformities of the shoulder, elbow, forearm, wrist, and hand. Common sequelae are internal rotation and adduction deformity of the shoulder, elbow flexion contractures, forearm supination deformity, and lack of wrist extension and finger flexion. Early microsurgical reconstruction of the affected plexus leads to a more rewarding overall function of the upper arm, but residual deformities might appear later which are similar, although less serious, than those observed in untreated cases. Secondary procedures of the shoulder, elbow, forearm, and hand will improve the appearance and function of the upper extremity in late cases of obstetrical brachial plexus. Careful preoperative planning is mandatory and a multistage approach should be applied, depending on the type of palsy and the age of the patient.

Elbow flexion reconstruction by Steindler flexorplasty in obstetric brachial plexus palsy

The results of Steindler flexorplasty in nine patients with obstetric brachial plexus palsy are reported. There were 5 girls and 4 boys with a mean age of 6 (range 2-13) years. Selection criteria for the procedure included strong (at least M4) grip strength and wrist and elbow extension, as well as the presence of the "Steindler effect". Pre-operatively, elbow flexion was rated as M0 or M1 in three patients and M2 in the remaining six patients. Intra-operatively, the detached common flexor origin was advanced 5 to 7 cm and fixation was done to the anterior humerus either with direct suture to the periosteum (in younger children) or suturing into a drill hole in the humerus (in older children). Postoperatively, the elbow was immobilized in flexion and supination for 6 weeks. At a mean follow-up of 5 years, the results in eight patients were good with mean active elbow flexion against resistance of 110 degrees and a mean elbow flexion contracture of 35 degrees. The result in the remaining patient was poor (unsuccessful transfer). It is concluded that the results of the Steindler flexorplasty in obstetric brachial plexus palsy patients are good and reliable, provided patient selection is careful.

Donor, recipient and nerve grafts in brachial plexus reconstruction: anatomical and technical features for facilitating the exposure

Forty three cadavers of adult and five patients were included in our study. Accessory, suprascapular, musculocutaneous and sural nerves were dissected. These widely used nerves in brachial plexus reconstruction have varying anatomy and still have no standard approach for surgery. Dissection of the accessory nerve in the upper part of the posterior neck triangle was quite complicated took a relatively long time and the nerve could easily be injured. It was found that these shortcomings could be diminished starting dissection of this nerve in the lower part of the posterior neck triangle near the anterior border of trapezius muscle 2 cm (0-3.5) above the clavicle. Accessory nerve entered inner surface of this muscle 3 cm (1-4) from this edge. The proximal portion of the suprascapular nerve was not difficult to identify if post-traumatic scarring is absent. Alternative approach was starting dissection from the junction of C5 and C6 into superior trunk. The suprascapular nerve diverged distally from this junction at 2 cm (0-2.5). The proximal portion of the musculocutaneous nerve was identified by cutting clavicle or tendon of major pectoral muscle. Quicker and less traumatic exposure of this nerve was starting dissection in the bed between biceps and coracobrachialis muscles. The first branches of the musculocutaneous nerve to the biceps brachii muscle took onset 4 cm (3.5-6) distally from the lower margin of the tendon of major pectoral muscle. First branch to the brachial muscle originated from the musculocutaneous nerve distally from the same tendon at 9.4 cm (6.1-10.5). Two main but controversial principles exist in sural nerve graft dissection: time saving and less traumatic approach. Long nerve graft is necessary during brachial plexus reconstruction when many interposition grafts are needed. Technique of multiple (4-7) transverse skin incisions let us to get sural nerve with both branches as long as 66 cm (average 47 cm). Total length of this nerve mainly depended on branching level, which was found to be 27.5 cm (9-35) measuring proximally from the lateral ankle.

Surgical Strategy for Infant Obstetrical Brachial Plexus Palsy: Experiences at Chang Gung Memorial Hospital

BACKGROUND

Strategies for management of infant obstetrical brachial plexus palsy remain controversial, including timing of surgery and treatment modalities.

METHODS

The senior author (Chuang) performed surgical explorations on 78 infant obstetrical brachial plexus palsy patients from 1992 to 1999. Sixty-eight patients underwent brachial plexus operation during the infant period (2 to 11 months), and 10 patients underwent surgery beyond the infant period.

RESULTS

For the ruptured upper and/or middle trunk injury (Erb's palsy), better shoulder and elbow function was observed in those who received numerous short grafts from C5 to the suprascapular and posterior division and from the C6 spinal nerve to the anterior division of the upper trunk. For the rupture injury associated with root avulsion (total palsy), nerve graft and transfer (intraplexus and extraplexus) provided a one-stage reconstruction for shoulder, elbow, and especially hand functions. The contralateral C7 or ipsilateral part of the ulnar nerve transfer was rarely used in infant obstetrical brachial plexus palsy, compared with adult brachial plexus injury.

CONCLUSIONS

The operative results proved that earlier timing of nerve surgery (within 3 months) is strongly indicated in patients who have total palsy, and only relatively indicated in patients with isolated rupture of the upper plexus.

Obstetric brachial plexus palsy associated with breech delivery

A review of the English literature revealed that only two birth palsy centers have specifically reviewed their experience with obstetrical palsy associated with breech delivery. The aim of this paper is to review the author's center's experience with birth palsy associated with breech delivery, compare their epidemiological and surgical findings with previous studies, and describe their management approach to this unique injury. A total of 34 limbs were studied. Erb's palsy was seen in 32 limbs and total palsy was seen in the remaining 2 limbs. The mean birth weight was low (2.3 kg). Six patients had bilateral lesions and 3 patients had phrenic nerve palsy. In their center, the indication for primary brachial plexus exploration is the lack of active elbow flexion against gravity at 4 months of age. A study of the natural history showed that 58% of limbs had full spontaneous recovery, 21% had good but partial recovery, and the prognosis was considered to be poor in the remaining 21% of limbs because active elbow flexion was not evident by 4 months of age. Intraoperatively, the usual lesion was C5/C6 avulsion or avulsion in situ, which seemed to be specific for breech deliveries. Their approach for management is described, including the role of Oberlin's ulnar nerve to biceps nerve transfer in these cases. Finally, the lack of contractures at the shoulder and elbow in these patients are explained.