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World J Crit Care Med. Dec 9, 2024; 13(4): 98579
Published online Dec 9, 2024. doi: 10.5492/wjccm.v13.i4.98579
Subclavian vessels injury: An underestimated complication of clavicular fractures
Byron Chalidis, First Orthopaedic Department, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 57010, Greece
Vasileios Davitis, Pericles Papadopoulos, Charalampos Pitsilos, Second Orthopaedic Department, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54635, Greece
ORCID number: Byron Chalidis (0000-0003-1305-2734); Vasileios Davitis (0009-0004-7975-7272); Pericles Papadopoulos (0000-0002-4727-9796); Charalampos Pitsilos (0000-0002-3091-866X).
Author contributions: Chalidis B and Pitsilos C designed the research; Pitsilos C and Davitis V analyzed the data; Chalidis B, Davitis V and Pitsilos C wrote the paper; Chalidis B and Papadopoulos P supervised the paper; all of the authors read and approved the final version of the manuscript to be published.
Conflict-of-interest statement: There is no conflict of interest associated with any of the senior author or other coauthors contributed their efforts in this manuscript.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Byron Chalidis, MD, PhD, Assistant Professor, First Orthopaedic Department, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, G Papanikolaou Hospital Exohi, Thessaloniki 57010, Greece. byronchalidis@gmail.com
Received: June 29, 2024
Revised: September 4, 2024
Accepted: September 9, 2024
Published online: December 9, 2024
Processing time: 123 Days and 12.6 Hours

Abstract

Clavicle fractures are frequent orthopedic injuries, often resulting from direct trauma or a fall. Most clavicle fractures are treated conservatively without any complications or adverse effects. Concomitant injuries of the subclavian vein or artery are rarely encountered and most commonly associated with high-energy trauma or comminuted clavicle fractures. They are potentially life-threatening conditions leading to hemorrhage, hematoma, pseudoaneurysm or upper limb ischemia. However, the clinical presentation might be obscure and easily missed, particularly in closed and minimally displaced clavicular fractures, and timely diagnosis relies on early clinical suspicion. Currently, computed tomography angiography has largely replaced conventional angiography for the assessment of subclavian vessel patency, as it demonstrates high accuracy and temporal resolution, acute turnaround time, and capability of multiplanar reconstruction. Depending on the hemodynamic stability of the patient and the severity of the injury, subclavian vessel lesions can be treated conservatively with observation and serial evaluation or operatively. Interventional vascular techniques should be considered in patients with serious hemorrhage and limb ischemia, followed by stabilization of the displaced clavicle fracture. This review aims to provide a comprehensive overview of the incidence, clinical presentation, diagnostic approaches, and current management strategies of clavicle fractures associated with subclavian vessel injuries.

Key Words: Clavicle; Fracture; Subclavian artery; Subclavian vein; Fracture non-union; Postoperative complications

Core Tip: Clavicle fractures complicated by vascular injuries are rare and potentially life-threatening conditions. Diagnosis of subclavian vessel injuries might be substantially delayed due to the overshadowing presence of the more obvious fracture symptoms and pain. Sound knowledge of the anatomy, better understanding of the severity of injury and fracture pattern and thorough clinical examination are important to raise the suspicion of a vascular injury and optimize medical care. Clavicle fractures combined with subclavian vessel injuries that are associated with serious hemorrhage or limb ischemia should be addressed operatively to restore vascular continuity and upper limb function. Future research should aim at optimizing diagnostic protocols and exploring advanced therapeutic techniques to enhance patient care in these complex cases.



INTRODUCTION

Clavicular fractures are common injuries, particularly among young and active individuals, often resulting from falls, sports activities and traffic accidents[1]. They show the highest incidence of all shoulder girdle fractures and account for up to 4% of all adult fractures[2,3]. The majority of clavicle fractures occur at the midshaft region of the clavicle, which is the weakest point of the bone[4].

Although most clavicular fractures heal uneventfully without significant complications, the proximity of fracture location to major neurovascular structures, such as the subclavian vessels and brachial plexus, carries the risk of serious and potentially life-threatening conditions[5]. Subclavian vessels are more susceptible to injury in trauma patients with spiral or oblique clavicle fracture where sharp bone fragments may lacerate and damage the surrounding soft tissues[6]. Injury of the subclavian vessels can lead to hematoma formation, pseudoaneurysm, compromised blood flow to the arm and major bleeding, necessitating early medical attention and often urgent surgical intervention[7]. However, the clinical presentation might be obscure and easily missed, particularly in closed and minimally displaced clavicular fractures, and timely diagnosis relies on early clinical suspicion[6,8]. Therefore, understanding of bone and neurovascular anatomy of the clavicular region is essential for the effective management of complex injuries with simultaneous involvement of the clavicle and subclavian artery or vein[9].

This review aims to highlight the significance of prompt diagnosis of subclavian vessel injuries associated with clavicular fractures as a key factor to optimize medical care, improve recovery and minimize complications. Furthermore, the current evidence regarding the available treatment options for the treatment of these complex injuries and the expected functional outcome is thoroughly discussed.

ANATOMY
Clavicle

The clavicle is a s-shaped long bone that functions as a strut between the sternum and the scapula, thereby playing a crucial role in shoulder biomechanics[10]. It is divided into three parts: (1) The medial (sternal) end; (2) The shaft; and (3) The lateral (acromial) end[11]. The medial clavicle articulates with the manubrium of the sternum at the sternoclavicular joint, while the lateral part of the bone articulates with the acromion of the scapula forming the acromioclavicular joint[6]. The clavicle also serves as an attachment site for several muscular structures, including the deltoid, trapezius, subclavius, pectoralis major, and sternocleidomastoid muscles[12].

Subclavian vessels

The subclavian artery and vein are located adjacent to the clavicle and facilitate blood supply and drainage of upper limb, respectively[13].

The subclavian artery originates from the brachiocephalic trunk on the right side and directly from the arch of the aorta on the left side[14]. It travels laterally and passes posterior to the clavicle and over the first rib, before becoming the axillary artery at the lateral border of the first rib[12]. In relation to the clavicle, the artery is located postero-superiorly at the medial edge of the bone but gradually becomes postero-inferior at the midshaft and inferior laterally[15]. A mean bone to vessel distance of beyond 10 mm has been found along its entire course[16].

The subclavian vein is formed by the union of the axillary and cephalic veins and runs parallel and anterior to the subclavian artery[9,13]. It travels behind the clavicle and merges with the internal jugular vein to form the brachiocephalic vein[17]. At the medial half of the clavicle, the mean bone to vein distance is less than 10 mm, and this close proximity between the two structures predisposes to vessel rupture and hemorrhage during injury or at the time of fracture fixation with plates and screws (Figure 1)[16].

Figure 1
Figure 1 Graphic depiction of the anatomy of clavicle and subclavian vessels. Diagonal stripes illustrate the shaft region that is in close proximity to subclavian artery and vein.
EPIDEMIOLOGY

Clavicular fractures are a common musculoskeletal injury, accounting for approximately 2.6% to 5% of all adult fractures and 35% to 44% of acute shoulder girdle injuries[2]. The midshaft portion of the clavicle is the most frequently affected location, constituting about 62% to 81% of all clavicular fractures[18,19]. The subclavian vessels may be damaged at the time of the initial injury or during fracture fixation or even in the course of conservative management of clavicle fractures[19]. The overall incidence of subclavian vessel injury after clavicular fractures is relatively low and estimated at around 0.3% to 3%[2,20]. Despite the rarity of the complication, the implications of such injuries are severe and potentially catastrophic as subclavian vessels are the main conduits responsible for the blood supply of upper limbs[21]. Studies have shown that subclavian vessel injuries are more likely to occur in clavicle fracture patterns with significant displacement and comminution or after high-energy trauma, such as motor vehicle accidents and falls from height[22,23]. Additionally, clavicular fractures combined with penetrating upper extremity and chest trauma have a higher incidence of vascular injuries compared to blunt trauma[24]. These conditions can lead to life-threatening complications including hemorrhage, ischemia and nerve damage, requiring urgent diagnosis and accurate intervention[25]. A comprehensive review by Katras et al[26], which included patients suffering from clavicular fractures complicated by vascular injuries, showed that the majority of those conditions needed immediate surgical intervention, highlighting the importance of early detection and management. Moreover, another study by Smith and Gupta[21] emphasized that the diagnosis of subclavian vessel injury might be substantially delayed due to the overshadowing presence of the more obvious fracture symptoms and pain.

MECHANISM OF INJURY

The underlying mechanism of subclavian vessels injury at the time of clavicular fractures is multifaceted and involves both direct and indirect trauma[27,28]. Sound knowledge of the anatomy of the area and better understanding of the severity of injury and fracture characteristics would raise early the suspicion of a vascular injury and would prevent a life-threatening hemorrhagic complication (Table 1)[29].

Table 1 Mechanism of subclavian vessel injury.
Direct trauma
Indirect trauma
Laceration or puncture from sharp fracture fragmentsCrush between clavicle and adjacent bones
Penetration from comminuted fragments after high energy mechanismAcute external compression after hematoma formation
Perforation from fixation implantsStretch after distraction injury
Chronic compression from hypertrophic callus
Direct trauma

Direct laceration or puncture of the subclavian vessels may be encountered directly by the sharp edges of fractured clavicle fragments[30]. This could be more common in comminuted midshaft clavicular fractures, where the displaced fracture ends may impinge and damage the subclavian artery or vein[28]. In high-energy trauma, such as motor vehicle accidents or falls from height, the fracture fragments can also penetrate the subclavian vessels, leading to severe vascular damage and hemorrhage[31]. On the other hand, iatrogenic injury of subclavian vessels may occur during surgical treatment with open reduction and internal fixation. Vessel perforation by the drill bit or screws is likely to result in acute intraoperative bleeding or late vascular and neurological complications[32,33].

Indirect trauma

At the time of injury, subclavian artery and vein can be crushed against the first rib or displaced clavicular bone fragments causing vessel occlusion, thrombosis or pseudoaneurysm formation[27,34-36]. Moreover, traction forces during fall or vehicle accidents could stretch subclavian vessels beyond their capacity and lead to intimal tears or vessel spasm and secondary restriction of blood flow[37]. On some occasions, excessive bleeding from the medullary cavity of the fractured clavicle results in hematoma formation in the surrounding space and subsequent subclavian vessel compression and obstruction[26,38,39]. Similarly, external compression from callus formation in the setting of hypertrophic nonunion may predispose to late vascular insufficiency[40].

PRESENTATION AND DIAGNOSIS OF SUBCLAVIAN VESSEL INJURY

Subclavian vessel injury following clavicular fractures may be presented with many different clinical features, depending on the type of vascular lesion (Table 2)[26,28,41]. This heterogeneity of symptoms and clinical course underlines the importance of meticulous clinical examination and proper laboratory screening for confirmation of the arterial or vein injury[42].

Table 2 Types of subclavian vessel lesions.
Subclavian artery
Subclavian vein
Laceration and tearLaceration and tear
Occlusion, stenosis, and external compressionThrombosis
Aneurysm, pseudoaneurysm, pseudoaneurysm rupture or thrombosisAneurysm
Arteriovenous fistula
Subclavian arterial injury

Post-traumatic subclavian artery laceration following a clavicle fracture can cause hypovolemic shock, anemia, coagulopathy and threatens patient’s life[20,32]. However, when arterial bleeding is restricted by the surrounding tissues and is well-controlled, no additional clinical features present and observational treatment can be appropriate to address vascular pathology[43].

Occlusion or severe compression of the subclavian artery can result in limb ischemia and decreased perfusion of upper extremity[27,42,44]. Pallor, coldness and delayed capillary refill are strong indications for immediate arteriography to evaluate the blood flow to the extremity and the location of the lesion[42]. Sodhi et al[28] described a case of a young man who admitted with shock and decreased level of consciousness in the emergency department after a motor vehicle accident. The patient had no palpable left upper extremity pulses and emergent angiogram revealed a complete occlusion of his left subclavian artery as a result of a displaced medial midshaft clavicle fracture. Similarly, Katras et al[26], reported a 52-year-old man who presented to the hospital with left arm ischemia due to distal subclavian artery obstruction after a posteriorly displaced distal clavicle fracture. Apart from acute subclavian artery involvement, delayed external vascular compression during shoulder abduction and development of thoracic outlet syndrome have been also described due to hypertrophic callus formation after clavicular fracture union or more often non-union[40,45].

Acute or late arterial thrombosis is another rare complication of clavicle fractures[41,46]. Lyons et al[47] reported a 12-year-old girl with absent right radial pulse after a fall while cheerleading. Chest and shoulder x-rays illustrated a closed right clavicle fracture, while angiogram and Doppler ultrasound confirmed an acute incomplete subclavian arterial thrombosis. On the other hand, Van Schaik et al[41] described a middle-aged man who presented with ipsilateral upper extremity numbness and claudication, five years after a conservatively treated clavicular fracture. Imaging studies revealed subclavian and brachial artery thrombosis, which were attributed to fracture nonunion and mobility of bone fragments.

Secondary formation of subclavian artery aneurysm or pseudoaneurysm has been also reported after a clavicular fracture. A pseudoaneurysm (or false aneurysm) is determined by a tear in the arterial wall and collection of blood around the vessel and it is much more common than a true aneurysm after clavicular fractures[48-50]. It may remain asymptomatic for a long time exhibiting a tumor-like lesion appearance or it may be thrombosed or ruptured[42,51]. Delayed onset of paresthesia and development of brachial plexopathy could be also symptoms of subclavian artery pseudoaneurysm formation[52]. In the case reported by Rodriguez-Merchan and Gomez-Cardero[53], an arterial pseudoaneurysm was presented as a supraclavicular mass at 3 months after a closed clavicle fracture. As the fracture was not healed, a correlation between fracture delayed union and development of pseudoaneurysm was established. In another published case report, Pallet et al[54] diagnosed a subclavian artery pseudoaneurysm 5 years after open reduction and internal fixation of a midshaft clavicle fracture. The patient complained of ipsilateral hand numbness, the radial pulse was absent and the Allen test demonstrated significantly reduced patency of the radial artery and mildly reduced patency of the ulnar artery. Imaging studies did not reveal any contact of a screw tip with the vessel and the authors related artery pseudoaneurysm development to chronic abrasion of the vessel against the metalware and fracture callus during shoulder movements. Lawson et al[55] reported a case of a young woman who presented with acute axillary and supraclavicular swelling after a sports massage session due to rupture of subclavian artery pseudoaneurysm. The patient had a history of a clavicular fracture nonunion for 16 years and was diagnosed with a small subclavian artery pseudoaneurysm 6 years ago. Both vascular defect and clavicle non-union were addressed surgically with radiological-guided stenting and fracture internal fixation, respectively.

Arteriovenous fistula is another uncommon complication of clavicular fractures[56]. This direct connection between the subclavian artery and vein was previously reported after an open clavicle fracture or as sequelae of a conservatively treatment clavicular fracture[56,57].

Subclavian vein injury

Subclavian vein thrombosis is a distinct vascular disorder that has been correlated with clavicle fractures[58,59]. Claes et al[60] presented a case of a 20-year-old man who underwent open reduction and internal fixation of an isolated clavicle fracture after a motocross accident. Two weeks postoperatively, patient’s arm appeared swollen, red-colored, warm and tender with clearly expanded veins. Imaging studies revealed vein thrombosis, which was treated conservatively with administration of low molecular-weight heparin. Subclavian vein thrombosis has been also reported in conservatively treated clavicle fractures, as a result of displaced bone fragments or malunion[35,38].

Laceration of subclavian vein and subsequent bleeding or hematoma formation have been described at the time of clavicular injury and fracture or during surgical intervention and fracture fixation[37]. Bain et al[32] reported the fatal case of a 34-year old man who received open reduction and internal fixation of a displaced midshaft clavicle fracture. During the operative procedure, the most medial screw penetrated the subclavian vein causing laceration of the vessel and consecutive air embolism. Although bleeding was controlled, patient experienced a sudden hemodynamic collapse and died despite resuscitation efforts. Subclavian vein aneurysm formation as a result of clavicle fracture pseudarthrosis and subsequent development of thoracic outlet syndrome have been also reported in the literature[45].

Diagnosis

Patient symptoms and clinical presentation along with early clinical awareness are fundamental for the timely diagnosis of subclavian vessel injury[58,61]. However, imaging studies are necessary to confirm clinical suspicion and guide appropriate treatment decisions. Ultrasonography and Echo-Doppler are non-invasive tools that can be initially applied for the evaluation of subclavian artery and vein integrity[41,56]. However, angiography remains the gold standard for the confirmation of subclavian vascular lesions[62,63]. The classic angiography, including arteriography and venography, has been widely used in both emergent and chronic cases[33,37]. Most recently, computed tomography (CT) angiography has replaced classic angiography for the assessment of vessels patency, as it demonstrates high accuracy and temporal resolution, acute turnaround time and capability of multiplanar reconstruction[39,61,64]. The injection of contrast medium during angiography facilitates detection of vessel disruption or extravasation[64]. Moreover, CT angiography has the additional advantage of 3-dimentional reconstruction of the vessels network providing a more detailed description of the vascular lesion[49].

TREATMENT

Depending on the hemodynamic stability of the patient and the severity of the injury, subclavian vessel lesions can be treated conservatively or interventionally.

Conservative treatment

Conservative treatment of subclavian vessel injuries after clavicle fractures include observation and drug administration. Costa et al[43] described a case of a young man suffering from clavicle and multiple rib fractures. Even though the ipsilateral radial pulse was absent and a distal subclavian artery tear was identified, no vascular intervention was performed and full recovery of vessel patency was confirmed after a 12-month follow-up period. Cooney and Kloss[38] presented a male patient with subclavian vein hematoma formation secondary to clavicle fracture nonunion. As there was no active bleeding or other concomitant neurovascular injuries, the hematoma was successfully treated conservatively with observation and frequent follow-ups, and no further management was required. In another case published by Conant and Hickerson[56], an arteriovenous fistula between the subclavian artery and vein was detected four months after a non-united medial third closed clavicle fracture. The authors commented that the elevated venous pressure due to hypertrophic callus formation resulted in venous dilation and subsequent fistula development. Both bone and vessel lesions were managed with observation alone, as no pain and functional impairment existed.

Anticoagulation therapy is the primary treatment of subclavian vein thrombosis[59,65]. Thrombolysis has been associated with favorable results if administered within the first 14 days from the onset of symptoms[65]. The pharmacologic anticoagulation includes the use of direct oral anticoagulants, vitamin K antagonists or low molecular weight heparin for 3 months to 6 months after the event, without any established advantage of one agent over the others[66]. Among all the available anticoagulants and according to the literature data, the low molecular weight heparin has been most extensively used for the treatment of subclavian vein thrombosis following clavicle fractures with proven effectiveness and safety[35,47,60].

Interventional and surgical treatment

Clavicle fractures combined with subclavian vessel injuries that are associated with serious hemorrhage or limb ischemia should be addressed operatively[67]. In this scenario, the clavicle fracture can be fixed simultaneously through the same approach and after re-establishment of the blood flow[26,34]. Autologous or synthetic vascular grafts are necessary for the restoration of subclavian vein and artery continuity in case of irreparable tears[28]. These can be used as interposition grafts to restore the vascular continuity in situ or as vascular bypass to reroute the blood flow around the lesion[28,43]. However, acute and sharp lacerations of the subclavian artery may be amenable to direct repair with good to excellent outcomes[26].

On the other hand, chronic subclavian artery stenosis can be managed effectively with intravascular intervention and stent placement[46]. Percutaneous vascular stent implantation is the suggested treatment option also for subclavian pseudoaneurysms, as it minimizes the risks of open surgery[33,53,68]. However, development of symptomatic pseudoaneurysms after clavicle fractures may require open surgery if extensive bone overgrowth or prominent metalware are apparent. In this case, repair of pseudoaneurysms should be combined with partial claviculectomy and hardware removal[69,70].

PROGNOSIS

Clavicle fractures associated with traumatic subclavian vessel injuries are infrequent clinical conditions. The symptoms may vary from simple hematoma and soft-tissue swelling to severe limb ischemia and life-threatening hemorrhage[67]. Mortality from such injuries ranges from 5% to 30% but these numbers do not represent the true rate, as some patients do not survive to reach medical care[71]. Regardless the selected treatment choice, early diagnosis and proper assessment of bone fracture and vascular lesion have been associated with full recovery and at least satisfactory functional outcome in the vast majority of cases[72]. However, the paucity of data due to the rarity of injury does not allow the extraction of secure conclusions.

CONCLUSION

While subclavian vessel injury in the context of clavicular fractures is quite uncommon, its potential severity warrants a high index of suspicion, especially when high-energy trauma and significantly displaced fractures are apparent. Arterial and venous complications may develop immediately at the time of injury or up to years later. Clinical awareness and timely intervention are the key points to achieve good outcome and low mortality rate.

Footnotes

Provenance and peer review: Invited article; Externally peer reviewed.

Peer-review model: Single blind

Specialty type: Critical care medicine

Country of origin: Greece

Peer-review report’s classification

Scientific Quality: Grade C

Novelty: Grade B

Creativity or Innovation: Grade C

Scientific Significance: Grade B

P-Reviewer: Soldera J S-Editor: Luo ML L-Editor: A P-Editor: Yuan YY

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