Canalicular lacerations occur in all age groups with a wide range of etiologies. It is important to understand the anatomy when considering the importance of a laceration to this structure. The canaliculi are located at the most medial margins of the four eyelids. The punctum is a superficial opening into the canaliculus functioning to draw tears out of the eye and into the canaliculus. In most people, an upper and lower canaliculus from each eye then drain into a common canaliculus and finally into the lacrimal system.
Lacerations to this region affect the drainage system of the eye, can affect the muscles and tendons of the orbit, and potentially even the facial bones. Damage to the underlying facial bones, or more significant injury to the eye, is beyond the scope of this article. Our primary focus will be on explaining the etiology, epidemiology, important elements of the history and physical examination, and to list management strategies for a canalicular laceration.
Trauma may be direct or indirect and blunt or penetrating. Direct penetrating traumas may occur by foreign objects, including glass, metal, or some organic materials. Indirect blunt traumas can occur by physical assaults, such as with a fist or bat, a finger poke, or may occur during vehicle accidents, such as an impact against the steering wheel. A dog bite injury represents a mixed blunt and penetrating direct trauma. Injuries from a fistfight represent the most common cause overall, regardless of age, while dog bites represent the most common cause among children. Injuries from falls are the most common cause among the elderly.
One of the first studies researching the etiology of canalicular lacerations demonstrated that 84% of this type of injury was caused by indirect trauma without injury to the eyelid. This finding may suggest a component of over-stretching the canaliculi to the point of avulsion.
A more recent study found that 55% of canalicular lacerations were due to direct, penetrating injuries, and this study further suggested that indirect injuries tend to have more extensive injuries to the facial bones, the globe of the eye, and other parts of the body.
Canalicular lacerations occur more commonly in males than in females and most frequently in children and young adults. The population least afflicted are those in the middle ages. Blunt trauma from fist fighting is the most frequent cause overall. Elderly patients may sustain this type of injury as a result of facial trauma during falls. Children less than four years are more likely to sustain lacerations as a result of dog bites. Pit Bull Terriers are the dog breed most commonly cited. Intoxicants, such as alcohol, are frequently involved.
History and physical examination will be of the utmost importance in making the diagnosis. It is important to first rule out life or vision-threatening injuries.
Upper facial trauma should increase the physician's suspicion of the possibility of canalicular laceration. The source of the injury will play an important role in management. Vaccination status should be clarified, specifically regarding tetanus. High-risk populations are predisposed to developing complications (e.g., severe infection), making it important to recognize the presence of an immunocompromised state, smoking status, and other risk factors.
Canalicular lacerations may not be obvious on initial physical examination, probing, or other modalities that may be beneficial to help make the diagnosis. You may try using loupes, slit lamp, or a surgical microscope. One study has suggested the injection of viscoelastic material to help in the identification of canalicular injury. Topical phenylephrine produces vascular constriction and muscular contraction, both useful to decrease bleeding and improve identification of the injury. Young children may require sedation in order to obtain an adequate examination. Fluorescein, or air, may be injected into the opposite punctum utilizing a 27-gauge needle - this strategy will produce dye or bubbles from the ipsilateral canaliculus.
The extraocular movements and visual acuity should be assessed. A good pupillary examination is important, looking specifically at the shape, as a teardrop pupil could indicate a ruptured globe. Fluorescein staining may be beneficial to assess for corneal abrasions and Seidel's sign. The palpation of the facial bones is important in assessing for the presence of facial bone fractures. This is important because these fractures may require surgical repair and should be performed prior to addressing the canalicular injury. One study found that up to 1.4% of patients sustaining canalicular laceration due to dog bite also had associated facial bone fractures.
In addition to physical exam, a Non-contrast CT scan is the imaging modality of choice for facial bone fractures and are also crucial in assessing for retained foreign bodies. Dedicated orbital CTs may be indicated based on clinical suspicion for orbital bone disruption. MRI can be considered but is unlikely to be indicated, after ruling out foreign bodies.
As discussed earlier, prompt evaluation of the orbit, globe, and associated structures is required. It is important to recognize that deeper lacerations are more likely to cause canalicular damage, and the type of object plays a role - glass tends to produce deeper lacerations, while a fist is more likely to cause injury due to shearing forces. Tetanus status should be clarified with the patient, and updated as needed. The identification/removal of foreign bodies and copious irrigation of the wound will work to reduce the risk of infection. CT, or less likely plain film, imaging may be indicated to assess for foreign bodies and underlying facial bone fractures. The source of the injury may indicate the need for additional prophylaxis, i.e., consideration of rabies immunoglobulin or antibiotic coverage in a dog, or cat, bites. The most commonly utilized antimicrobial is amoxicillin-clavulanate. For those with severe penicillin allergy, consider doxycycline or trimethoprim-sulfamethoxazole PLUS metronidazole or clindamycin. The duration of therapy should be 3 to 5 days following injury with close monitoring for signs of infection.
Ophthalmologic consultation should occur early in the course, as these specialists are likely to guide immediate and long-term therapies. While definitive management is likely to be required by ophthalmic, plastic, and reconstructive surgeons, an initial skin-layer repair may occur by an emergency department physician, but this should occur only after discussion with a specialist. It is important to identify both pieces of the canaliculus, so that they may be appropriately anastomosed - this will decrease the risk of patient developing epiphora. An absorbable suture material (e.g., polyglactin, chromic gut) should be utilized for the repair of the canaliculus itself. Immediate surgical repair may not be required for monocanalicular lacerations, and delays up to 48-hours may be acceptable ; however, early repair is likely to limit complications.
Surgical repair is always indicated for lacerations involving both the superior and inferior canaliculi. The use of stents when repairing the canaliculi is likely to improve the cosmetic results and the overall prognosis. There are multiple trademarked brands of stents for both monocanalicular and bicanalicular injuries. The location of the laceration (proximal, mid, or distal) does not seem to influence the success of the repair. Children may require sedation, both to obtain a thorough examination, and for repair.
Laceration to the eyelid that does not involve the canalicular system occurs more frequently. An experienced operator will repair simple eyelid lacerations. More complex eye lacerations that should warrant consult ophthalmology include full-thickness lid lacerations, lacerations with orbital fat prolapse, and lacerations through the lid margins. A ruptured globe is an ophthalmologic emergency and should be treated prior to the management of an eyelid injury. Facial bone fractures requiring repair should be addressed prior to proceeding with repair of the canalicular injury.
For the majority of patients requiring repair of canalicular lacerations, develop cosmetic and functional success. This includes the lack of epiphora and otherwise functional lacrimal system. Success rates for injuries involving the lacrimal apparatus may be as high as 82%.
Lacerations involving the canalicular system may involve the periorbital muscles which can affect the overall function of the eyelids. The most commonly cited complications of canalicular repair include pain, bleeding, infection, scarring, ptosis, or the requirement for additional procedures at a later time. Rarely, patients may require a second surgery for the management of epiphora, entropion, ectropion, or poor positioning of the eyelid. Lacerations to the canaliculi and lacrimal system may lead to scarring and stenosis.
As mentioned above, canalicular lacerations are considered to be complex eyelid lacerations and warrant consultation to ophthalmology, plastic surgery, or oral maxillofacial surgery. Others on this list include full-thickness lid lacerations, lacerations with orbital fat prolapse, lacerations through the lid margin, lacerations with poor alignment, or lacerations involving other parts of the tear drainage system.
It is important to educate the patient on local wound care and avoidance of additional insult/injury. A thorough discussion and the potential complications, including the need for additional repair, should be addressed early. If prophylactic antimicrobial coverage is pursued, education regarding potential side effects should occur. The explanation for the use of ice and compression to reduce edema should also occur. If the laceration repair occurs in an emergency department, or another acute care setting, contact information referral to ophthalmology will be key for establishing appropriate follow-up.
The majority of patients with an injury to the canaliculi are likely to make the first contact with healthcare through an emergency department or another acute care facility. The management of canalicular laceration does not stop in the emergency department. Early referral to, and discussion with, ophthalmology, plastic surgery, or maxillofacial surgery will produce the best long-term outcomes. Collaboration, shared decision making, and communication are key elements for a good outcome. Only by working as an interprofessional team can the morbidity of canalicular laceration be decreased. The earlier signs and symptoms of complications are identified, the better the prognosis and overall outcome. A holistic and integrated approach, with interprofessional collaboration, can help to achieve the best possible outcomes for these patients. [Level 3]
|||Guo T,Qin X,Wang H,Lu Y,Xu L,Ji J,Xiao C,Zhang Z, Eiology and prognosis of canalicular laceration repair using canalicular anastomosis combined with bicanalicular stent intubation. BMC ophthalmology. 2020 Jun 22 [PubMed PMID: 32571261]|
|||Kennedy RH,May J,Dailey J,Flanagan JC, Canalicular laceration. An 11-year epidemiologic and clinical study. Ophthalmic plastic and reconstructive surgery. 1990; [PubMed PMID: 2268600]|
|||Wulc AE,Arterberry JF, The pathogenesis of canalicular laceration. Ophthalmology. 1991 Aug; [PubMed PMID: 1923361]|
|||Jordan DR,Ziai S,Gilberg SM,Mawn LA, Pathogenesis of canalicular lacerations. Ophthalmic plastic and reconstructive surgery. 2008 Sep-Oct; [PubMed PMID: 18806662]|
|||Wladis EJ,Dewan MA, Periorbital trauma from pit bull terrier attacks. Orbit (Amsterdam, Netherlands). 2012 Jun; [PubMed PMID: 22551377]|
|||Örge FH,Dar SA, Canalicular laceration repair using a viscoelastic injection to locate and dilate the proximal torn edge. Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus. 2015 Jun; [PubMed PMID: 26059664]|
|||Ho T,Lee V, National survey on the management of lacrimal canalicular injury in the United Kingdom. Clinical [PubMed PMID: 16451257]|
|||Wei LA,Chen HH,Hink EM,Durairaj VD, Pediatric facial fractures from dog bites. Ophthalmic plastic and reconstructive surgery. 2013 May-Jun; [PubMed PMID: 23511998]|
|||Stefanopoulos PK,Tarantzopoulou AD, Facial bite wounds: management update. International journal of oral and maxillofacial surgery. 2005 Jul; [PubMed PMID: 16053863]|
|||Correira K, Managing dog, cat, and human bite wounds. JAAPA : official journal of the American Academy of Physician Assistants. 2003 Apr; [PubMed PMID: 14968515]|
|||Drnovsek-Olup B,Beltram M, Trauma of the lacrimal drainage system: retrospective study of 32 patients. Croatian medical journal. 2004 Jun; [PubMed PMID: 15185420]|
|||Dortzbach RK,Angrist RA, Silicone intubation for lacerated lacrimal canaliculi. Ophthalmic surgery. 1985 Oct; [PubMed PMID: 3906483]|
|||Hawes MJ,Segrest DR, Effectiveness of bicanalicular silicone intubation in the repair of canalicular lacerations. Ophthalmic plastic and reconstructive surgery. 1985; [PubMed PMID: 3940129]|
|||Sadiq MA,Corkin F,Mantagos IS, Eyelid Lacerations Due to Dog Bite in Children. Journal of pediatric ophthalmology and strabismus. 2015 Nov-Dec; [PubMed PMID: 26371465]|