|Year : 2016 | Volume
| Issue : 2 | Page : 147-153
Limited open reduction and elastic intramedullary nailing for mid-shaft clavicular fractures
Adham Elgeidi MD (Orth & Trauma) , Mohammed Fahmi, Abd Elrahman Elganainy
Department of Trauma and Orthopaedic Surgery, Mansoura University, Mansoura, Egypt
|Date of Submission||22-Nov-2014|
|Date of Acceptance||10-May-2015|
|Date of Web Publication||28-Mar-2017|
PO Box 95 Mansoura University, Mansoura 35516
Source of Support: None, Conflict of Interest: None
Elastic intramedullary nailing (EIN) of displaced mid-shaft clavicular fractures is a minimally invasive technique, which was reported to be a simple procedure with low complication rate and good functional results. Other studies, however, report on specific problems with this technique. This prospective study reports on EIN in displaced mid-shaft clavicular fracture. We hypothesized that restoration of clavicular length is the primary goal of EIN.
Patients and methods
Between January 2008 and January 2012, 36 patients with simple, wedge or comminuted mid-shaft clavicular fractures were treated with EIN. Clavicular shortening was determined after trauma and after osseous consolidation on true clavicle anteroposterior radiograph with a 20° cephalic tilt with the patient in a standing position. Radiographic union was assessed every 4 weeks. Patient satisfaction was assessed at final follow-up after 1 year.
Among the 36 patients, 34 fractures healed, and each underwent a planned procedure for nail removal. Complications included two nonunions, one delayed union, two nail migrations and one deep-wound infection. EIN led to restoration of clavicular length in simple and wedge fractures. We were not able to restore length in comminuted fractures through the EIN technique. Patient satisfaction at a mean follow-up of 29.5 months was significantly correlated with the lesser post-traumatic and posthealing shortening, quicker fracture healing and early implant removal.
Intramedullary nail fixation for acute simple or wedge-type mid-shaft clavicular fractures provides a safe and predictable treatment option. In comminuted fractures, however, EIN does not provide the needed stability to restore clavicular length.
Keywords: clavicle, fracture, intramedullary nailing, shortening
|How to cite this article:|
Elgeidi A, Fahmi M, Elganainy AE. Limited open reduction and elastic intramedullary nailing for mid-shaft clavicular fractures. Egypt Orthop J 2016;51:147-53
|How to cite this URL:|
Elgeidi A, Fahmi M, Elganainy AE. Limited open reduction and elastic intramedullary nailing for mid-shaft clavicular fractures. Egypt Orthop J [serial online] 2016 [cited 2017 Aug 20];51:147-53. Available from: http://www.eoj.eg.net/text.asp?2016/51/2/147/203149
| Introduction|| |
Fractures of the clavicle are common, accounting for 3–5% of all fractures in adults, with mid-clavicular fractures accounting for 70–80% of all clavicle fractures; more than half of these fractures are displaced ,. It is most often caused by a simple fall on the outstretched hand or a direct impact on the shoulder. They usually affect active and healthy people during sports activities or road traffic accidents. These patients are asking for a quick and full recovery. Until now, treatment was usually conservative for mid-clavicle fractures. However, many recent papers pointed out long-term deficits following conservative treatment for clavicle fractures, leading more surgeons to propose surgical treatment to their patients. In summary, nonoperative treatment of acute mid-shaft clavicle fractures result in an overall nonunion rate of 5.9%. The nonunion rate for displaced fractures is 15.1% .
Until the mid 1990s, many authors reported on good outcomes for fracture healing and restoration of function after nonoperative treatment of clavicle fractures, whereas the patients’ complaints were thought to be of cosmetic concern only. However, there is growing evidence and awareness that the outcome of such treatment is not as satisfactory as was previously thought. In one of the first papers to highlight the limits of conservative treatment, Hill et al.  showed a high rate of nonunion (15%) and unsatisfactory results (31%). McKee et al.  evaluated 30 patients at a mean of 55 months and showed that after conservative treatment strength of the involved shoulder was reduced to 75% compared with the uninjured shoulder.
Conservative treatment is a good option for nondisplaced or minimally displaced fractures. Grossly displaced mid-shaft clavicle fracture is an indication for surgery to lower nonunion rate and to minimize cosmetic and functional sequelae. Advocates for plating point out the quality of reduction and the rigid fixation with improved rotational stability. However, plating is associated with soft-tissue stripping, big scar and discomfort with such superficial plates. Advocates for intramedullary fixation point out the easy procedure, the limited exposure, the good cosmetic results and the satisfactory union rate .
The use of titanium elastic nails in the treatment of mid-shaft clavicular fractures was first introduced by Jubel et al. . Excellent clinical results encouraged us to take advantage of this technique to treat displaced mid-shaft clavicular fractures. The purpose of this prospective study was to evaluate the use of elastic intramedullary nailing (EIN) with limited open reduction in the management of fully displaced mid-shaft clavicular fractures and to compare our results with those reported in the literature. We hypothesized that restoration of clavicular length is the primary goal of EIN.
| Patients and methods|| |
Between January 2008 and January 2012, 36 consecutive patients with simple, wedge or comminuted mid-shaft clavicular fractures were treated with EIN at Mansoura University Hospitals, Egypt, and prospectively evaluated.
Inclusion criteria were (i) isolated, unilateral, displaced mid-shaft clavicular fractures with no cortical contact between the main fragments, and (ii) age between 18 and 60 years. Exclusion criteria were (i) fractures of the medial or lateral third of the clavicle, (ii) pathological or open fractures, (iii) neurovascular injury and (iv) additional shoulder girdle fractures.
Fracture type and post-traumatic clavicular shortening were determined on true clavicle anteroposterior radiograph with a 20° cephalic tilt with the patient in a standing position. Fractures were classified according to the Orthopaedic Trauma Association system. Simple shaft fractures were coded as 15B1, wedge fractures as 15B2 and complex fractures as 15B3.
Clavicular shortening was determined after trauma and after osseous consolidation in millimetres, with the uninjured side serving as a control for the clavicular length.
Surgery was performed within 3 days after trauma under general anaesthesia. Single dose of antibiotics was given preoperatively, and antibiotics were continued for 3 days postoperatively. The 2.0–3.5-mm elastic titanium nails were used. A 1-cm skin incision was made over the sternal end of the clavicle ∼1 cm lateral to the sternoclavicular joint. The anteroinferior cortex of the clavicle was drilled with a 2.7-mm drill-bit. The hole was widened with an awl, and the elastic titanium nail was advanced to the fracture site through oscillating movements under fluoroscopic control. Another limited 1-cm incision was made over the fracture site for direct manipulation of the main fragments, leaving the other fragments untouched. This was done with the help of fluoroscopic control.
Postoperatively, the arm was put in a shoulder sling. Pendulum exercises and pain-dependent passive mobilization were started immediately, and the range of shoulder motion was gradually increased but kept within 90° during the first 4 weeks after surgery. Active range of motion rehabilitation exercises were allowed after 4 weeks postoperatively. Heavy load bearing was not recommended until osseous consolidation. Once fracture union was achieved, nail removal was done for all patients ([Figure 1],[Figure 2],[Figure 3]).
Radiographic union was assessed every 4 weeks. Radiographic union was defined as complete cortical bridging between the medial and lateral fragments. Clavicular shortening was determined again after osseous consolidation. Patient satisfaction was assessed at final follow-up after 1 year. Patients were asked about pain, cosmetic appearance, ability to return to work and overall satisfaction .
Complications included (i) two cases of symptomatic nonunions after 24 weeks requiring revision surgery, (ii) one patient with symptomatic malunion with pain and easy fatigability requiring corrective osteotomy, (iii) two cases with telescoping and medial nail migration and protrusion with subsequent clavicle shortening who needed cutting the nail under local anaesthesia and (iv) one case with deep infection who responded to early surgical lavage and the appropriate antibiotics.
The SPSS version 16.0 (SPSS Inc., Chicago, Illinois, USA) was used for statistical analysis. Metric scaled data are reported as arithmetic mean±SD and categorical data as absolute frequency and percentage distribution. Depending on the distribution form, a t-test for independent samples was used. For paired samples, a t-test was used. The analysis of bivariate correlation was performed by using the Pearson correlation coefficient. The probability level was set at P value of less than 0.05.
| Results|| |
Demographic data are shown in [Table 1].
|Table 1 Demographic data, mechanism of injury and fracture classification|
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Time to union in weeks is shown in [Table 2]. It was 9.3±5.3 weeks for the whole sample. It was especially shorter in the simple fracture type.
Post-traumatic shortening and shortening after union are shown in [Table 3]. We observed a significant improvement of shortening for the simple and wedge fracture types (P=0). In the comminuted fracture subgroup, there was no significant improvement of shortening (P=0.13).
Complications are listed in [Table 4]. Nonunion occurred in two cases with comminuted fracture type. Telescoping and nail migration occurred in one patient with comminuted fracture type and another patient with a wedge-type fracture.
Patient’s satisfaction is shown in [Table 5]. At a mean follow-up of 29.5 months (range: 12–48 months), we had 77.8% satisfaction rate. Patient’s satisfaction with significantly correlated with post-traumatic shortening, fracture healing in weeks, posthealing shortening and earlier implant removal ([Table 6]).
| Discussion|| |
The clavicle has an S-shaped configuration with medial and lateral flat ends, a tubular middle and a very small medullary canal. These considerations explain that plates or rigid nails are relative unsuitable implants . The clavicle acts as a bone strut to maintain the width of the shoulder and therefore provides the power and stability to the arm-trunk mechanism; thus, shortening after clavicle fractures may have an effect on shoulder function. This might be a specific problem with the use of intramedullary nailing with telescoping and nail protrusion . Clavicular shortening leads to static changes in the shoulder girdle. The sternoclavicular joint angle increases, and the resting position of the scapula and the preload of the muscles of the shoulder girdle change. This might lead to limitations in the overhead motion and symptoms such as pain, weakness and easy fatigability . Restoration of clavicular length was therefore stated as a primary goal of EIN .
Traditionally, conservative treatment has been the major treatment of clavicular fracture. In two landmark studies from 1960s by Neer  and Rowe , nonunion rates were relatively low when conservative treatment was applied. Neer  reported nonunion in only three out of 2235 mid-shaft clavicular fracture patients treated conservatively, whereas Rowe  reported four nonunions out of 566 patients. These findings have dominated the clinical approach for displaced clavicular fractures for a long time. However, more recent studies showed much higher nonunion rates and unsatisfactory functional outcomes ,,,,.
Open reduction and internal fixation has gradually been recognized as an effective treatment for displaced or shortened (>2 cm) mid-shaft clavicular fractures ,. Plating has been considered the gold standard for operative treatment of displaced mid-shaft clavicular fractures for decades. Various types of plates are commonly used. Reconstruction plates are easier to contour to fit the irregular curve of the clavicle, which promotes bone healing ,. Plating has advantages of rigid fixation and improved rotational stability that may offer a superior construct for highly comminuted fractures. However, it requires large incisions and extensive soft-tissue dissection, which could cause complications such as infection, scarring and refracture after plate removal .
Intramedullary fixation provides an alternative and less invasive technique for plating of mid-shaft clavicular fractures. Various types of pins – for example, screws, Kirschner wires, Rockwood pins, Hagie pins and threaded pins – have been widely studied. The main advantages of intramedullary pinning are less soft-tissue dissection and a more cosmetic scar. However, the main disadvantages of this technique are hardware migration and concerns about early mobilization .
In the meta-analysis of Zolowodzki et al. , the nonunion rate is 5.9% for fractures treated nonoperatively, 2.5% for fractures treated with a plate and 1.6% for fractures treated with an intramedullary pin. Intramedullary nailing was used for a long time with good results. In a prospective nonrandomized study, Lee et al.  compared 56 patients treated with Knowles pins and 32 patients treated by plate. Shoulder score, union rate and healing time were not significantly different between the two groups, leading the authors to propose pinning rather than plating . Chu et al.  noted a 100% union rate and a constant score of 97% from 73 cases treated with Knowles pins reported at 1-year follow-up.
Titanium EIN was initially used in the paediatric fracture treatment with good functional results that led to its use for treatment of adult fractures. In contrast to screws, Kirschner wires or pins, the titanium elastic nail is flexible with a curved tip that is fixed in the cancellous bone of the lateral clavicle. This helps it to accommodate the S-shaped contour of the clavicle and adhere tightly to the cortex. From a biomechanical point of view, intramedullary positioning of the implant is ideal. The three-point stabilization and the curved tip of the EIN could provide a better antibending and antitorsion load and decrease the occurrence of hardware migration .
In the series from Jubel et al. , all fractures treated with elastic stable intramedullary nailing united and the constant score was 98% 1-year after surgery. However, the authors proposed the nail only for transverse or oblique fractures or for wedge fractures. Whenever comminution is present, they proposed plating rather than nailing .
Our data show that the patient satisfaction (77.8%) and complication rate (16.7%) at a mean of 29.5 months after limited open reduction and EIN of mid-shaft clavicular fractures are acceptable. However, based on our experience, the key advantage of EIN with limited odd ratio is that it allows for a functional fracture healing (9.3±5.3 weeks) mainly because of restoration of clavicular length (22% improvement). The flexible minimally invasive stabilization of simple or wedge fracture allows for adequate quick healing (simple=5.6±2 weeks, wedge=11±3 weeks) with satisfactory restoration of clavicular length (simple=62.4% improvement, wedge=22.8% improvement) that correlates with shoulder function. However, for the comminuted fractures, we had a longer healing time (13.2±6.5 weeks) and failure to maintain clavicular length (2.8% loss of length). The two cases of nonunion in this series occurred in comminuted fracture type.
The periosteal blood supply might remain intact in simple and wedge fractures. Increasing stability using EIN in a biologically favourable environment might lead to a significant faster osseous union and lower rates of nonunion, which was observed in our study. On the other hand, in comminuted fracture type, postoperative telescoping does not stop until the lateral main fragments gets into contact with the medial main one. These comminuted fractures are typically caused by high-energy trauma and are associated with a higher degree of soft-tissue damage and impairment of the periosteal blood supply. We agree with Jubel et al.  that surgical stabilization by plating is to be considered for comminuted fractures to provide stability and maintain clavicular length and endosteal blood supply.The rate of nail migration in our series was 5.6%. The rate of hardware migration of EIN in the literature is between 4.5 and 26.6% ,,. Usually, the nail is cut at the medial insertion site. In our operation, the end of the nail was bent 90°–180° and cut off. Thus, a 1–2 cm bending end was buried subcutaneously at the anteroinferior cortex to avoid being covered with bone ([Figure 2]). This bending serves to prevent lateral migration, greatly reduces skin irritation and the nail could be removed with local anaesthesia alone. With full motion of the shoulder girdle, the clavicle moves cranially 30°, dorsally 35° and rotates about 50° . Therefore, as also suggested by Frigg et al. , we restricted the range of motion to 90° for the first 4 weeks. This helps to decrease the nail migration and to maintain the stability.
There are some limitations of the study that should be considered. The number of patients is relatively small (36 patients), and the mean follow-up time is only 29.5 months. We realize that a larger and a long-term study would appropriately address these issues. With these issues in mind, we believe that the treatment protocol in this study improved the quality of life in the majority of patients (28/36; 77.8%).
| Conclusion|| |
The treatment of displaced mid-clavicular fractures in adults with limited open reduction and internal fixation with EIN is a safe and minimally invasive surgical procedure. A high bone union rate and favourable patient satisfaction can be obtained with few complications. In comminuted fractures, however, EIN does not provide the needed stability to restore clavicular length.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6]