Introduction

The periorbital region, encompassing the eyelids, canthi (corners of the eyes where eyelids meet), and surrounding soft tissues, plays a crucial role in both facial aesthetics and ocular function. At the centre of this region lies the inner corner of the eye, also referred to as the medial canthus. They are anchored by the medial canthal tendon (MCT), a ligament in the face which maintains the position and function of the eyelids relative to the globe.

Telecanthus is a condition characterised by an abnormally increased distance between the inner corner of the eye (medial canthi), while the interpupillary distance remains normal. Unlike hypertelorism, which involves bony orbital widening and an increased interorbital distance, telecanthus primarily results from soft tissue displacement or malposition of the MCT. It may occur as part of congenital syndromes such as Waardenburg or blepharophimosis syndrome, or it may be acquired following trauma or surgical interventions.

The condition can lead to both functional and cosmetic issues, including epiphora, eyelid malposition, and psychosocial distress due to altered facial symmetry. Early and accurate diagnosis is critical to determine the appropriate treatment approach.

Medial canthoplasty is the cornerstone surgical technique for correcting telecanthus. By repositioning and securing the MCT, the procedure restores the normal intercanthal distance, improves eyelid function, and enhances facial harmony. This article explores the anatomical basis, indications, and evolving techniques in medial canthoplasty for telecanthus correction.¹

Anatomy of the medial canthal region

Detailed knowledge of the medial canthal region is critical for the effective surgical correction of telecanthus. The primary anatomical structure of interest is the medial canthal tendon (MCT), which anchors the medial canthus to the frontal process of the maxilla. It consists of anterior and posterior limbs that contribute to eyelid positioning and stability. The MCT ensures proper eyelid-globe apposition and maintains the normal intercanthal distance, typically around 30–35 mm in adults.

Adjacent to the MCT lies the lacrimal drainage system, including the puncta, canaliculi, lacrimal sac, and nasolacrimal duct. These structures are closely integrated with the medial canthal anatomy and are at risk during surgical intervention. Surrounding osseous structures, such as the nasal bone and maxilla, provide anchoring sites for surgical fixation techniques during medial canthoplasty.

The integrity and function of the MCT are critical to preserving both eyelid contour and tear drainage. Any disruption—whether congenital, traumatic, or iatrogenic—can lead to medial eyelid displacement and telecanthus. Given the complexity and compact nature of this region, precise anatomical knowledge is indispensable in surgical planning. Understanding the relationships between the MCT, lacrimal apparatus, and bony landmarks ensures safe dissection, accurate repositioning, and optimal functional and aesthetic outcomes.²

Etiology and classification of telecanthus

Telecanthus can be categorised based on its origin into congenital and acquired forms. Congenital causes are often syndromic and include conditions like Waardenburg syndrome, characterised by dystopia canthorum, and blepharophimosis-ptosis-epicanthus inversus syndrome (BPES), where telecanthus is a prominent diagnostic feature. Other congenital craniofacial anomalies may also present with increased intercanthal distance due to maldevelopment of the medial canthal structures.

Acquired telecanthus typically results from trauma, especially midfacial fractures involving the nasoethmoidal complex, or from iatrogenic causes, such as complications following orbital or eyelid surgeries. It may also develop as part of syndromes involving tissue laxity or scarring.

It is important to differentiate telecanthus from hypertelorism, where the entire bony orbit is laterally displaced, increasing the interpupillary and interorbital distances. In contrast, telecanthus involves a normal interpupillary distance with medial soft tissue displacement.

Clinically, telecanthus is diagnosed when the intercanthal distance exceeds normative values (usually >35 mm in adults), with preserved interpupillary spacing. Accurate classification is essential to determine the underlying cause and guide the appropriate surgical correction strategy.³

Indications for medial canthoplasty

Medial canthoplasty is indicated in patients with telecanthus where the abnormal positioning of the medial canthi leads to functional or aesthetic concerns. Functionally, telecanthus can cause eyelid malposition, such as incomplete closure (lagophthalmos) or improper alignment of the eyelid margin, potentially resulting in ocular surface exposure, irritation, or epiphora due to disruption of the lacrimal drainage system.

In many cases, especially those involving congenital syndromes or trauma, the primary indication is cosmetic correction. A widened intercanthal distance can significantly alter facial proportions and symmetry, leading to psychological and social distress, particularly in young patients or those with syndromic facial features.

Careful patient selection is crucial for achieving optimal results. Ideal candidates are those with a measurable increase in intercanthal distance, stable underlying bone structure, and realistic expectations. Evaluation should include detailed history, physical examination, and standardised facial measurements.

Preoperative imaging, such as CT scans, is often used to assess the underlying bony anatomy and soft tissue structures. These studies help guide surgical planning, particularly in complex or post-traumatic cases. Understanding the extent of medial canthal displacement is essential for determining the most appropriate surgical approach and ensuring both functional and aesthetic restoration.⁴

Surgical techniques in medial canthoplasty

The primary goals of medial canthoplasty are to reposition the medial canthal tendon (MCT) to its anatomically correct location, thereby narrowing the intercanthal distance and restoring both function and facial harmony. Various techniques have been developed to achieve stable fixation of the MCT, depending on the underlying cause, patient age, and anatomical complexity.

One of the most widely used methods is transnasal wiring, in which a stainless steel or non-absorbable suture is passed through the MCT and anchored to the contralateral side of the nasal bone or periosteum, effectively drawing the canthi medially. This technique offers strong and lasting fixation and is especially useful in traumatic or syndromic cases where tissue laxity is present.

Medial canthal tendon shortening is another technique, often used in conjunction with transnasal wiring. In this method, redundant or stretched portions of the tendon are excised, and the remaining tendon is reattached under appropriate tension.

Z-plasty or Y-V plasty techniques are employed when there is associated soft tissue deficiency or scarring. These local flap procedures help to realign tissue, redistribute tension, and improve the final cosmetic outcome, especially when dealing with epicanthal folds or post-traumatic deformities.

Fixation methods may include bone tunnels, titanium screws, or mini-plates, especially in cases requiring rigid stabilisation. The choice of fixation depends on surgeon preference and the integrity of the nasal bones.

Materials used for reinforcement may be autologous, such as fascia lata or periosteal grafts, or alloplastic, including silicone or porous polyethene implants, especially in reconstructive procedures.

Pediatric patients pose unique challenges due to ongoing facial growth and delicate anatomy. Surgical interventions are typically more conservative, and fixation methods are selected to minimise interference with growth centres. In adult patients, more rigid fixation can be employed with fewer long-term concerns.

Through careful technique selection and individualised planning, medial canthoplasty can achieve durable and aesthetically pleasing outcomes.

Postoperative care and potential complications

Effective postoperative care is essential to ensure optimal healing and reduce the risk of complications following medial canthoplasty. Patients are typically prescribed a regimen that includes topical and systemic antibiotics, anti-inflammatory medications, and lubricating eye drops. Wound care involves gentle cleansing and monitoring for signs of infection or dehiscence. Follow-up visits are scheduled regularly to assess healing and tendon positioning.

Most patients experience mild swelling and bruising that resolves within 1–2 weeks. Suture removal, if applicable, is usually performed between 5 to 10 days postoperatively. The full healing process, including scar maturation and tissue remodelling, may take several months.

Potential complications include asymmetry, infection, visible scarring, lacrimal system injury, and under- or over-correction of the intercanthal distance. In some cases, revision surgery may be necessary to address unsatisfactory results.

To minimise risks, careful preoperative planning, precise anatomical dissection, and the use of stable fixation techniques are critical. Surgeons must also consider individual anatomical variability and choose techniques tailored to the patient's specific needs. Close postoperative monitoring further helps in identifying and addressing complications early, leading to better long-term functional and aesthetic outcomes.

Advances and trends in medial canthoplasty

Recent advancements in medial canthoplasty have focused on improving precision, reducing invasiveness, and enhancing cosmetic outcomes. Minimally invasive techniques, including smaller incisions and refined dissection tools, have led to faster recovery and less scarring.

The integration of endoscopic assistance and computer-assisted navigation offers enhanced visualisation, particularly in complex or revisional cases, enabling more accurate placement of the medial canthal tendon.

Three-dimensional (3D) planning and simulation tools are increasingly used to preoperatively model the surgical outcome and tailor the procedure to each patient’s anatomy, ensuring better symmetry and predictability.

Looking ahead, innovations in biocompatible fixation materials, custom implants, and regenerative techniques hold promise for further improving both functional outcomes and patient satisfaction in medial canthoplasty procedures.⁵

Summary

Medial canthoplasty is a key surgical procedure used to correct telecanthus, a condition characterised by increased distance between the medial canthi with a normal interpupillary distance. This condition may arise from congenital syndromes, trauma, or previous surgeries, and can lead to both functional impairments (such as eyelid malposition and lacrimal drainage issues) and cosmetic concerns affecting facial symmetry.

The surgery involves repositioning the medial canthal tendon (MCT) to restore the normal intercanthal distance. A deep understanding of the anatomy of the medial canthal region, including the MCT, lacrimal system, and adjacent bony structures, is crucial for successful outcomes. Surgical techniques range from transnasal wiring and MCT shortening to local flap reconstructions such as Z-plasty or Y-V plasty, with various fixation methods employed depending on the case complexity.

Postoperative care focuses on infection prevention, wound healing, and early detection of complications like asymmetry, scarring, or lacrimal injury. With advancements in minimally invasive techniques, endoscopic tools, and 3D surgical planning, medial canthoplasty continues to evolve, offering more precise and aesthetically satisfying outcomes tailored to individual patient needs.

FAQs

What is the difference between telecanthus and hypertelorism?

Answer: Telecanthus refers to an increased distance between the medial canthi (inner corners of the eyes) with a normal interpupillary distance, caused by displacement of soft tissue structures like the medial canthal tendon. In contrast, hypertelorism involves a true bony widening of the orbits, increasing both the intercanthal and interpupillary distances. Differentiating between the two is crucial for planning appropriate treatment.

Who is a good candidate for medial canthoplasty?

Answer: Ideal candidates include patients with congenital or acquired telecanthus who are experiencing functional issues (like eyelid malposition or tearing) or cosmetic concerns due to facial asymmetry. Patients should have realistic expectations, stable health, and, in children, ideally be past the stage of rapid facial growth for permanent correction.

What are the common techniques used in medial canthoplasty?

Answer: Common techniques include transnasal wiring, medial canthal tendon shortening, and local flap reconstruction using Z-plasty or Y-V plasty. These may be combined with bone tunnels, titanium screws, or mini-plates for fixation. The choice depends on the cause of telecanthus, patient age, and anatomical considerations.

How long is the recovery period after medial canthoplasty?

Answer: Initial recovery, including reduction of swelling and bruising, usually takes 1 to 2 weeks. Full healing of tissues and scars may take several months. Most patients return to daily activities within a few days, but strenuous activity should be avoided until healing progresses under the surgeon's guidance.

What are the possible risks or complications of medial canthoplasty?

Answer: While generally safe, potential risks include infection, asymmetry, lacrimal system damage, visible scarring, or over- or under-correction of the intercanthal distance. Careful surgical planning and technique, along with proper postoperative care, help minimise these risks and ensure better outcomes.