|Year : 2020 | Volume
| Issue : 5 | Page : 647-653
Prognosis and risk factors of nerve injuries in displaced pediatric supracondylar humerus fractures
M Ozcan1, O Altinoz2, M Erem1, M Ciftdemir1, C Copuroglu1, FN Turan3
1 Trakya University, Medical Faculty, Department of Orthopaedic Surgery and Traumatology, Edirne, Turkey
2 Department of Orthopedic Surgery and Traumatology, Van Egitim Arastirma Hastanesi, Van, Turkey
3 Trakya University, Medical Faculty, Department of Biostatistics, Edirne, Turkey
|Date of Submission||14-Nov-2018|
|Date of Acceptance||31-Dec-2019|
|Date of Web Publication||4-May-2020|
Dr. M Ozcan
Trakya Universitesi Tip Fakultesi Ortopedi ve Travmatoloji AD, Edirne
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: Supracondylar humerus (SCH) fractures are serious injuries due to the neighborhood of critical neural and vascular structures. One of the most devastating complications of SCH fractures is neurological damage, since it may cause permanent disability. The aim of this study is to categorize neurological complications, to report long-term functional outcomes, and to determine risk factors associated with childhood SCH fractures. Methods: The records of 375 children were reviewed retrospectively. Data about amount and direction of displacement, the shape of the fracture, age at the time of fracture, gender, time from impaction to surgery, time of surgery, type of neurological injury, and recovery time were recorded. Results: Neurological complications were seen in 37 (9.85%) children. Thirteen (35.1%) of the children had an iatrogenic nerve injury. All iatrogenic injuries were fully recovered in this study. However, 2 children who had combined neurological injury of radial, ulnar, and median nerves did not recover. Nearly 95% of all children who had neurological injury recovered fully. An anterior long and sharp bone fragment (spike) was observed in most of the children with neurological injury, and this spike was seen in 14 (58.3%) patients who had a trauma-related injury (n = 24). Conclusion: The prognosis of these nerve injuries is excellent, especially the iatrogenic ones. A long and sharp bone fragment (spike) may be responsible for nerve injuries in some children. Surgical exploration is not necessary after an iatrogenic nerve injury when there is no neurotmesis. Patience and care are utmost needed to handle neurological complications.
Keywords: Cross-pinning, iatrogenic nerve injury, neurological injury, prognosis, supracondylar fracture
|How to cite this article:|
Ozcan M, Altinoz O, Erem M, Ciftdemir M, Copuroglu C, Turan F N. Prognosis and risk factors of nerve injuries in displaced pediatric supracondylar humerus fractures. Niger J Clin Pract 2020;23:647-53
|How to cite this URL:|
Ozcan M, Altinoz O, Erem M, Ciftdemir M, Copuroglu C, Turan F N. Prognosis and risk factors of nerve injuries in displaced pediatric supracondylar humerus fractures. Niger J Clin Pract [serial online] 2020 [cited 2020 Jun 4];23:647-53. Available from: http://www.njcponline.com/text.asp?2020/23/5/647/283722
| Background|| |
Fractures around the elbow constitute about 5–10% of all childhood fractures, and two-thirds of these fractures are supracondylar humerus (SCH) fractures., SCH fractures cause serious injuries due to the proximity of critical neural and vascular structures, increased risk of compartment syndrome, and difficulties in reduction; therefore SCH fractures represent an orthopedic emergency.
One of the most devastating complications of SCH fractures is neurological damage, since it may cause permanent disability. The incidence of neurological complications varies from 5% to 19% in the literature.,,
Nerve injuries can happen as a primary lesion at the time of initial impact due to stretching, entrapment, and disruption of nerve in fracture site; or they can occur as an iatrogenic injury during treatment period mostly due to medial pinning of the fracture. Excessive manipulation, immobilization in hyperflexion, swelling, and edema may also cause nerve dysfunction during the treatment period.
Most symptoms are local hypoesthesia or minor motor dysfunction, and they quickly recover spontaneously after the fracture.,, However, there is still no consensus in the literature about the treatment of neurological complications after SCH fractures.
The aim of this study is to categorize neurological complications and to report long-term functional outcomes associated with childhood SCH fractures.
| Methods|| |
Approval was obtained from the institutional ethics committee, and the data of the patients were collected retrospectively. Approval date was 07.09.2016. The children who were treated due to SCH fracture were included in the study. Gartland type-1 nondisplaced fractures, intraarticular fractures, patients older than 12 years of age, the patients who had a neurological injury due to cervical spine or brachial plexus injury, and the patients who were treated conservatively were excluded from the study. Data about fracture classification according to Gartland classification, amount and direction of displacement, age at the time of fracture, gender, time from injury to surgery, type of surgery, time of surgery, open fractures, type of neurological injury, and recovery time were recorded.
All the patients had either open or closed reduction, with two crossed pins. The ulnar nerve was pushed back with the thumb of the surgeon to minimize the risk of iatrogenic ulnar nerve injury. The patients who had nerve injury were followed up monthly until full recovery of neurological damage.
Statistical analysis was performed with IBM SPSS Statistics for Windows Version 19.0. (Armonk, NY: Released 2010). One sample Kolmogorov-Smirnov test was used to evaluate the suitability of quantitative data to the normal distribution. Mann Whitney-U test and Kruskal-Wallis variance analysis were used for the comparisons between the groups when the data was not suitable for normal distribution.
Fisher's exact test, continuity to correction, and Kolmogorov-Smirnov two-sample tests were used for qualitative data. Numbers, percentages, median (minimum-maximum) values, and mean values ± standard deviation (±SD) were used for descriptive statistics. A P value < 0.05 was considered statistically significant for all statistical analyses.
| Results|| |
The records of 375 children were available for review. There were 226 (60.3%) boys and 149 (39.7%) girls. The mean age was 5.8 ± 2.5 (median 5.5; minimum: 1, maximum: 12). There were 356 (94.9%) extension type III Gartland injuries and 19 (5.1%) flexion type III Gartland injuries.
Open reduction and cross-pinning (ORCP) was required in 128 (34.1%) children, and 247 (65.9%) children were treated by closed reduction and percutaneous cross-pinning (CRCP). The main reason for the open reduction was an unacceptable reduction (n = 109, 85.1%).
The children who had neurological injury were followed up until complete recovery of the nerve and mean follow-up time was 13.1 months. No improvement was observed in 2 children. One of them had a trauma-related radial nerve injury, and the other had an iatrogenic combined ulnar and radial nerves injury.
The time between the injury and surgery was calculated for each patient and called the surgical delay. The children with neurological injury were compared with the ones who had no neurological damage regarding the surgical delay, and the difference was statistically insignificant (P = 0.376).
Neurological complications were seen in 37 (9.85%) children, and they were summarized in [Table 1]. Around 13 (35.1%) children had an iatrogenic nerve injury, and they were summarized in [Table 2]. Seven of the children who had iatrogenic injury were treated with ORCP and six of them have been addressed with CRCP. The difference was statistically insignificant (P = 0.171).
When [Table 2] was observed it was recognized that 12 (92%) of the iatrogenic nerve injuries were ulnar nerve injuries. Iatrogenic and noniatrogenic nerve injuries were compared statistically, and it was observed that the incidence of ulnar nerve injury was statistically higher in iatrogenic injury group (P = 0.023). On the other hand, all iatrogenic injuries recovered in a mean time of 4.6 months (one patient who had persistent injury was removed in the calculation of mean).
Nine of the patients with neurological injury were explored surgically. The findings were summarized in [Table 3].
Furthermore, girls and boys were compared for the incidence of neurological injury. The incidence of neurological injury was 10.6% (n = 13) for boys and 8.7% for girls. The difference was insignificant (P = 0.671).
The relationship between age and neurological injury was also investigated, and a statistically significant difference was found. The mean age of the children who had neurological injury was higher than the children who had no damage (P < 0.001) [Table 1].
Mean operation time was 109 min, and it was 86 min for the ones who had an iatrogenic neurological injury. Although the operation time was shorter in iatrogenic injury group, this difference was nonsignificant (P = 0.913).
Around 35 (94.5%) children who had neurological injury recovered fully. Mean recovery times for each nerve were summarized in [Table 4]. No statistically significant difference was observed between the recovery times of each nerve (P = 0.07).
Mean recovery time was 4.92 ± 2.4 months (median: 6, min: 1, max: 8) for iatrogenic and 6.3 ± 3.8 months (median: 6, min: 1, max: 15) for noniatrogenic nerve injuries. Although the recovery of iatrogenic nerve injuries was faster than the fracture-related injuries, the difference was statistically nonsignificant (P = 0.286).
The relationship between the amount of displacement and the neurological injury was statistically significant (P = 0.013) [Table 1]. The incidence of neurological injury increased as the amount of displacement increased in this study.
The direction of displacement of children who had neurological injury was compared with the direction of displacement of patients who had no neurological injury, and no statistically significant difference was observed [Table 1].
There were 19 flexion type and 356 extension type injuries according to Gartland classification. These two types of injuries were compared for the development of neurological injury [Table 1]. Three (15.7%) neurological injuries were seen in the flexion group and 34 (9.6%) neurological injuries were seen in the extension group. The difference was insignificant (P = 0.621).
During radiological evaluations, an anterior long and sharp bone fragment (spike) was observed in most of the children with neurological injury, and it was also investigated [Figure 1]. This spike was seen in 14 (58.3%) patients who had a trauma-related neurological injury (n = 24). The spike was observed only in 12 (3.4%) patients who had no neurological injury after the trauma (n = 351). The difference was statistically significant (P = 0.017).
|Figure 1: Anterior-posterior view of long and sharp fracture in a Gartland type III SCH fracture (a), Lateral view of long and sharp fracture in a Gartland type III SCH fracture (b), Lateral view of long and sharp fracture in a Gartland type III SCH fracture (c)|
Click here to view
| Discussion|| |
Fracture related or iatrogenic neurological injuries are among the most frequent complications in the treatment of SCH fractures. The incidence of neurological complications has been reported to be as high as 49%. However, it ranged from 5% to 19%.,, The overall incidence of neurological injury in this study was, 9.85% and this incidence were comparable with the literature.
Moreover, boys (60.3%) were more susceptible to SCH fractures than girls (39.7%). Hence, neurological injuries were seen more frequently in boys. Male/female ratio was 1.5:1 for the whole patient population however it was 1.8:1 for the children who had a neurological injury. Although males suffer neurological injury more frequently than females, the difference was statistically insignificant.
Mean follow-up time was 5.3 months and this time is relatively short, and this is one of the limitations of this study. The children who had neurological injury were followed up until complete recovery of the nerve and mean follow-up time was 13.1 months for these kids (the two that did not recover were exceptions).
One of the controversial subjects is the timing of surgery. Schmid et al. reported that delay of treatment did not have a significant influence on rates of open reduction and complications. The surgical delay did not also affect neurological complications in this study. Therefore, elective treatment can be reasonable for children who had no signs of compartment syndrome to avoid complications.
The incidence of neurological injury was 9.5% in this study. This incidence was comparable with the literature (5%–20%).,,,, Regarding the incidence of each nerve, McGraw et al. found the median nerve to be most frequently damaged (53%), followed by the ulnar and radial nerve injury (23.5% each). Brown and Zinar reported the radial nerve injury to be most prevalent (61%), followed by the median nerve (28%) and ulnar nerve (11%). In this study, the most frequently injured nerve was ulnar nerve (54%), followed by the radial nerve (21.7%) and median nerve (8.1%). The incidence of ulnar nerve injury in this study was higher than those reported in the literature. However, 57% of ulnar nerve injuries were iatrogenic injuries. There was no statistical difference in the incidence of nerve injuries when iatrogenic injuries were removed. Therefore, it cannot be reported that the ulnar nerve is the most frequently injured nerve in pediatric SCH fractures in this study. We also observed that more than one nerve was found to be injured in 6 cases (16.3%), which is not infrequent, since van Vugt et al. had reported similar findings in almost 50% of the cases.
Iatrogenic nerve injury is a common postoperative complication in the treatment of pediatric SCH fractures. It was reported as high as 3.3%–14%,, in the literature. One-third of the children who had neurological injury had iatrogenic injuries in this study, and the incidence was 3.5%. The results were comparable with the literature. Joiner et al. mentioned that the two main reasons for the development of iatrogenic nerve injury are reduction and cross-pinning. Brauer et al. found that iatrogenic nerve injury occurred in 3.5% of the patients with cross pinning and 1.9% in lateral pinning. Lyons et al. observed iatrogenic ulnar nerve injury up to 20% of the children who were treated with cross pins. In a meta-analysis, the most common nerve involved in iatrogenic nerve injury was ulnar nerve (3.2% of all cases). In this study, all patients were treated with cross pinning, and 92% of the iatrogenic nerve injuries were ulnar nerve injuries. Seven of the children in this study who had iatrogenic injury were treated with ORCP, and six of them were treated with CRCP. The difference was statistically insignificant (P = 0.171). Mean operation time was 109 min, and it was 86 min for the ones who had an iatrogenic neurological injury. Although the operation time was shorter in iatrogenic injury group, this difference was not significant (P = 0.913).
Nevertheless, cross pinning can be the leading cause of iatrogenic nerve injuries due to medial pin irritation of the ulnar nerve. Dekker et al. found the overall incidence of persistent ulnar nerve-related complaints as 3.5/1000. Therefore, it is suggested that cross pinning can still be used with more attention in the treatment of pediatric SCH fractures if you are familiar with this method.
Khademolhosseine et al. had 18% nerve damage in their series and exploration was applied to five children. They observed complete resolution of all injuries and did not suggest immediate nerve exploration. Rasool et al. reported that the pin rarely pierced the nerve in their patients with operative exploration. Several studies have suggested that 85–100% of neurological injury is neuropraxia and they resolve in 2–3 months.,,, Routine surgical exploration is not recommended in the literature.,, In contrast, some authors recommend surgical exploration in selected cases. Culp et al. surgically explored nine children who had no signs of recovery in electromyography and reported one case with complete laceration of the radial nerve. In this study, nine patients were explored surgically and no severe damage by the pin was observed. No additional benefit was obtained with exploration in this study. It is unnecessary surgery and may cause increased morbidity; therefore, we do not also recommend surgical exploration when a nerve injury is associated with closed fracture, especially in children with iatrogenic ulnar nerve injury.
It is recommended to wait about 6 months before any diagnostic test is performed like electromyography. It is believed that motor function returns in about 6–12 weeks, however, the return of sensorial deficit can be delayed up to 6 months., Brown and Zinar reported average recovery time for the median, radial, and ulnar nerve injuries as 1.0, 1.8, and 3.6 months. Moreover, it was observed that the average ulnar nerve recovery is longer than other nerves in the literature. In this study, 95% of the children who had neurological injury recovered fully, and our results are comparable with the literature. The ulnar nerve was the most frequently injured nerve and recovered in about a mean time of 5.15 months. Median nerve injury was observed in 8% of the cases but they recovered more quickly (4.33 months). The number of radial nerve injuries was eight and the mean recovery time was 6.37 months. One child with radial nerve injury was surgically explored, and a contused but intact nerve was observed. This patient did not recover in 30 months of time and was lost to follow-up. No statistically significant difference was found between the recovery times of each nerve (P = 0.07). Average recovery times for each nerve in this study is longer than those reported in the literature. There were six combined injuries, and five of them recovered in 2 to 15 months. One child with a combined injury of ulnar and radial nerves did not also recover in 12 months follow-up, and this patient refused exploration. When we compare all injuries combined injuries healed more slowly but the difference was not significant. We suggest that surgical exploration can be postponed up to 12–15 months in combined injuries when there are no signs and symptoms of recovery.
Mean recovery times for iatrogenic and fracture-related injuries was compared and it was observed that iatrogenic injuries recovered faster but the difference was not significant.
Whether or not there is a relationship between the nerve-injured and the direction and amount of displacement remains controversial in the literature. Mc Graw et al. reported that posterolateral displacement was only associated with median nerve injury, on the other hand, posteromedial displacement was equally related to radial, median, and ulnar nerve injuries. In this study, no statistically significant relationship was observed between the nerve-injured and direction of displacement. Most of the injuries were associated with posteromedial displacement (three ulnar, one median, six radial, and three combined). There were six injuries related to posterolateral displacement (three ulnar, two median, and one combined). Pure posterior displacement was associated with two radial nerve injuries, and anterior displacement (flexion type injury) was related to two ulnar nerve and one combined injury. Our results did not support current literature findings. It was thought that the direction of force and displacement at the time of impaction are the primary determinants of nerve damage, rather than damage due to displaced bone.
It was also thought that the amount of displacement might affect soft tissue damage rather than the direction of displacement. There is no data related to this subject in the literature. The relationship between the amount of displacement and nerve injury was investigated, and a statistically significant relationship was found. The incidence of neurological injury was higher in displaced fractures. Therefore, it can be suggested that an increased amount of displacement is associated with an increased incidence of neurological injury according to the findings of this study.
Traditionally, it is thought that flexion type injuries cause neurological complications more frequently (mostly ulnar injury). There is not much data about this subject in the literature. In their series, Valencia et al. reported only one case of ulnar nerve injury associated with flexion type injuries. In this study three (15.7%) neurological injuries were seen in the flexion group (two ulnar, one combined) and 34 (9.6%) neurological injuries were seen in an extension group. The difference was not significant (P = 0.621). It cannot be mentioned that flexion type injuries are associated with more neurological complications according to the findings of this study.
During radiological evaluations, an anterior long and sharp bone fragment (spike) was observed in most of the children with neurological injury [Figure 1] and [Figure 2]. This spike was seen in 58.3% of the children who had a trauma-related neurological injury, on the other hand, it was observed only in 3.4% of the children who had no neurological injury after the trauma. The difference was statistically significant (P = 0.017). It was thought that this spike is one of the leading causes of neurological injury in SCH fractures in children, due to compression, contusion, or direct laceration. Therefore, the shape of the fracture is one of the leading causes of neurological injury in SHF in children.
The major limitation of this paper was the retrospective nature of the study. Mean follow-up time was also short (5.3 months) however, these children recovered quickly, and therefore longer follow-up was not needed in most cases. The children who had neurological injury were followed up until complete recovery (except the two that did not recover) and this time was 13.1 months. Prospective studies with huge numbers are needed for more precise results.
| Conclusions|| |
Neurological injury after SCH fractures in children is a depressing complication for both the surgeon and the family. The parents feel very anxious. However, the prognosis of these injuries is excellent, especially the iatrogenic ones. This information must be given to the family appropriately. Besides, patience is needed to handle neurological complications while explorations and reoperations are not helpful. If there is a sharp bone fragment, the surgeon must be alerted for neurological complication.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
| References|| |
Herring JA. Fracture about the elbow. In: Herring JA, editor. Tachdian's Pediatric Orthopaedics. Philadelphia: W.B Sounders; 2002. p. 2139-217.
Omid R, Choi PD, Skaggs DL. Supracondylar humerus fractures in children. J Bone Joint Surg Am 2008;90:1121-32.
Hadlow AD, Devane P, Nicol RO. A selective treatment approach to supracondylar fracture of the humerus in children. J Pediatr Orthop 1996;16:104-6.
Brown IC, Zinar DM. Traumatic and iatrogenic neurological complications after supracondylar humerus fractures in children. J Pediatr Orthop 1995;15:440-3.
McGraw JJ, Akbarnia BA, Hanel DP, Keppler L, Burdge RE. Neurological complications resulting from supracondylar fractures of the humerus in children. J Pediatr Orthop 1986;6:647-50.
van Vugt AB, Severijnen RV, Festen C. Neurovascular complications in supracondylar humerus fractures in children. Arch Orthop Trauma Surg 1988;107:203-5.
Valencia M, Moraleda L, Diez-Sebastian J. Long-term functional results of neurological complications of pediatric humeral supracondylar fractures. J Pediatr Orthop 2015;35:606-10.
Gosens T, Bongers KJ. Neurovascular complications and functional outcome in displaced supracondylar fractures of the humerus in children. Injury 2003;34:267-73.
Gartland JJ. Management of supracondylar fractures of the humerus in children. Surg Gynecol Obstet 1959;109:145-54.
Edmonds EW, Roocroft JH, Mubarak SJ. Treatment of displaced pediatric supracondylar humerus fracture patterns requiring medial fixation: A reliable and safer cross-pinning technique. J Pediatr Orthop 2012;32:346-51.
Campbell CC, Waters PM, Emans JB, Kasser JR, Millis MB. Neurovascular injury and displacement in type III supracondylar humerus fractures. J Pediatr Orthop 1995;15:47-52.
Schmid T, Joeris A, Slongo T, Ahmad SS, Ziebarth K. Displaced supracondylar humeral fractures: İnfluence of delay of surgery on the incidence of open reduction, complications and outcome. Arch Orthop Trauma Surg 2015;135:963-9.
Culp RW, Osterman AL, Davidson RS, Skirven T, Bore FW Jr. Neural injuries associated with supracondylar fractures of the humerus in children. J Bone Joint Surg Am 1990;72:1211-15.
Cramer KE, Green NE, Devito DP. Incidence of anterior interosseous nerve palsy in supracondylar humerus fractures in children. J Pediatr Orthop 1993;13:502-5.
Joiner ERA, Skaggs DL, Arkader A, Andras LM, Lightdale-Miric NR, Pace L, et al.
Iatrogenic nerve injuries in the treatment of supracondylar humerus fractures: Are we really just missing nerve injuries on preoperative examination? J Pediatr Orthop 2014;34:388-92.
Abbott MD, Buchler L, Loder RT, Caltoum CB. Gartlang type III supracondylar humerus fractures: Outcome and complications as related to operative timing and pin configuration. J Child Orthop 2014;8:473-7.
Khademolhosseini M, Abd Rashid AH, Ibrahim S. Nerve injuries in supracondylar fractures of the humerus in children: İs nerve exploration indicated? J Pediatr Orthop B 2013;22:123-6.
Brauer CA, Lee BM, Bae DS, Waters PM, Kocher MS. A systemic review of medial and lateral entry pinning for supracondylar fractures of the humerus. J Pediatr Orthop 2007;27:181-6.
Lyons JP, Ashley E, Hoffer MM. Ulnar nerve palsies after percutaneous cross-pinning of supracondylar humerus fractures in children. J Pediatr Orthop 1998;18:43-5.
Babal JC, Mehlman CT, Klein G. Nerve injuries associated with pediatric supracondylar humeral fractures: A meta analysis. J Pediatr Orthop 2010;30:253-63.
Dekker AE, Krijnen P, Schipper IB. Results of crossed versus lateral entry K-wire fixation of displaced pediatric supracondylar humeral fractures: A systematic review and meta-analysis. Injury 2016;47:2391-8.
Rasool MN. Ulnar nerve injury after K-wire fixation of supracondylar humerus fractures in children. J Pediatr Orthop 1998;18:686-90.
Flynn JC, Mathews JG, Benoit RL. Blind pinning of displaced supracondylar fractures of the humerus in children: Sixteen years' experience with long term follow-up. J Bone Joint Surg Am 1974;56:263-72.
Minkowitz B, Busch MT. Supracondylar humerus fractures. Current trends and controversies. Orthop Clin North Am 1994;25:581-94.
Royce RO, Dutkowsky JP, Kasser JR, Rand FR. Neurological complications after k-wire fixation of supracondylar fractures in children. J Pediatr Orthop 1991;11:191-4.
[Table 1], [Table 2], [Table 3], [Table 4]