Eyelid & Canalicular Trauma Repair

Overview

Eyelid lacerations are common after blunt or sharp periorbital trauma. Most follow the same repair principles as any facial laceration: meticulous layered closure, with close attention to cosmetic outcome. Two features specific to the eyelid change management for a subset of these injuries, and both must be checked on every case. The first is location: a laceration near the medial canthus risks the lacrimal drainage system. The second is depth: violation of the orbital septum signals an injury well beyond what the skin wound alone suggests. Neither finding is obvious without deliberately looking for it, and missing either one means treating a more serious injury as a routine skin laceration.

Eyelid Laceration Repair Principles

Repair of the eyelid margin rests on two principles: layered closure and margin alignment. Layered closure reapproximates the tarsal plate, orbicularis muscle, and skin as distinct anatomic layers rather than closing the wound in one pass, restoring both the lid's structural support (the tarsal plate functions as its skeleton) and its normal contour. Margin alignment is less forgiving: even a small step-off across the margin heals as a visible, permanent notch. The grey line, the pale landmark marking the most superficial extent of the orbicularis (specifically the muscle of Riolan, a small striated bundle at the margin), is the surgical reference point for this alignment. Matching it on either side of the laceration confirms the margin is truly restored anatomically, not just approximately.

Poor alignment causes lid notching, a permanent deformity that can be cosmetic or functional depending on severity. For this reason, lacerations that involve the margin warrant referral to someone experienced in oculoplastic repair rather than a standard emergency-department closure; a laceration confined to lid skin away from the margin carries no such requirement.

Canalicular Injury

Any laceration near the medial canthus, the inner corner of the eye, needs deliberate evaluation for canalicular injury. The upper and lower canaliculi, which carry tears from the punctum to the lacrimal sac and then the nose, run through exactly this territory. A medial lid laceration that looks like a simple skin cut can transect a canaliculus without any of that being visible on inspection, so the injury is easy to miss unless it is specifically sought.

A transected canaliculus that heals without realignment and stenting typically scars shut rather than reconnecting its lumen, so simply closing the skin over it is not enough. Once the canaliculus scars closed, that eye develops permanent epiphora, and the only fix at that point is lacrimal bypass surgery rather than revision of the original repair. Standard management of a known or suspected canalicular laceration is primary repair with intubation: a fine silicone stent is passed through the canalicular system across the laceration site, holding the cut ends in alignment and keeping the lumen patent while it heals. The stent usually stays in place for weeks to months before removal.

The Orbital Septum as a Depth Marker

The orbital septum is a thin sheet of connective tissue running from the tarsal plate to the orbital rim, separating the eyelid (preseptal) space from the true orbital (postseptal) space behind it. Whether a periorbital laceration has breached the septum is a visually assessable marker of how deep the injury actually goes. A laceration confined anterior to the septum is, by definition, superficial. One that violates the septum opens a path into the true orbit, where the injury may extend to orbital fat, the extraocular muscles, or, in more severe trauma, the globe or optic nerve itself.

The practical sign of septal violation is orbital fat, sometimes called preaponeurotic fat, visible within the wound. Because this fat normally lies behind the septum, seeing it confirms the septum has been breached and should prompt a broader evaluation for deeper orbital injury rather than treatment as a simple skin laceration. The same region is vulnerable to blunt trauma by a different mechanism entirely: see our page on orbital blowout fracture for how a direct blow can fracture the orbital floor beneath it.

High-Yield Pearls

• Layered closure (tarsus → orbicularis → skin) + precise margin alignment via the grey line are the two pillars of eyelid laceration repair.
• Medial lacerations → assume canalicular injury until excluded; repair with realignment and stenting to prevent permanent epiphora.
• Orbital fat visible in a wound = orbital septum breached = evaluate for deeper orbital injury, not just the skin laceration in front of you.

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