Orbital reconstruction: the challenge of implant failures and revisions

Surgical reconstruction using implants is the standard of care for displaced orbital fractures. However, implant malpositioning remains a frequent complication. Literature data report a revision rate of 6.5% for primary reconstructions, rising to 14% when the orbital rim is involved. In complex fractures, the use of titanium mesh can even lead to 23% of malpositions. Beyond aesthetics, these failures result in severe functional sequelae: persistent diplopia, pain, or optic neuropathies. Certain late complications, such as heterotopic bone formation, may only manifest several years after the initial surgery.

This retrospective study, conducted on a consecutive series of seven patients in a tertiary care center, analyzes the multidisciplinary management (plastic and oculoplastic surgery) of malpositioned implants. The objective is to precisely correlate patient-reported symptoms, failure patterns identified by imaging (CT/MRI), and surgical revision strategies. The authors aim to define clear decision-making criteria: when to limit the intervention to explantation, when to reposition the hardware, and in which cases to prioritize a patient-specific implant (PSI) to restore anatomy in a predictable manner.

Methodology: analysis of a series of complex cases

This study is based on a retrospective case series conducted within a tertiary academic center over a five-year period. The analysis focuses on seven patients who required surgical revision following the malposition of an orbital implant or the onset of symptoms related to the latter (complete removal, replacement, or secondary reconstruction).

The management protocol is based on multidisciplinary collaboration between plastic surgery and oculoplasty. Surgical planning integrated advanced technological tools to secure these delicate procedures:

• Virtual Surgical Planning (VSP): use of mirror-image overlay models.
• 3D Modeling: printing of patient-specific anatomical models.
• Intraoperative navigation: use of the Medtronic StealthStation™ platform for the most complex cases.

A major challenge addressed by the authors concerns the lack of traceability of the initial interventions: the surgical approach used during the primary implant placement was unknown for 5 out of 7 patients. For the revision, the inferior transconjunctival orbitotomy was preferred (71.4% of cases), sometimes supplemented by a transcaruncular extension or a lateral canthotomy.

Postoperative follow-up included standardized clinical measurements (Hertel exophthalmometry, marginal reflex distances MRD1/MRD2) and ocular motility tests, correlated with CT or MRI imaging to assess symptom resolution.

Clinical profile and cohort characteristics

This case series involves 7 patients who required surgical revision for orbital implant malposition. The cohort shows a female predominance (71.4%, n=5) with a median age of 60 years (range: 29–78 years). A major clinical finding emerges: the median delay between primary reconstruction and revision is 26 months, but with extreme variability ranging from 1 to 144 months, illustrating the sometimes very late onset of complications.

Operative data and surgical strategies

The surgical approach was adapted to the complexity of each case. Inferior transconjunctival orbitotomy was the predominant technique, used in 71.4% of procedures. Operative times (from 50 min to 5 h 46) reflect the disparity of clinical situations, although blood loss remained minimal (5 to 75 mL).

• Specific approaches: Case No. 3 required a complex multi-path strategy including a transoral hemi-LeFort 1, a transfacial approach, and a lateral eyebrow incision. Case No. 6 benefited from a specific skin incision for the simultaneous excision of a fistulous tract.
• Technicality: The dissection systematically aimed at exposing the implant capsule, with particular attention to the protection of the optic nerve and the oculomotor muscles.
• Navigation: The use of virtual surgical planning (VSP) and intraoperative navigation has been integrated for the most complex cases.

In accordance with the exploratory nature of this case series, no inferential statistical analysis (p-values) was performed, as the data are presented descriptively.

The critical challenge of precision in orbital reconstruction

This case series highlights an underestimated clinical reality: the malposition of an orbital implant is not merely an aesthetic defect, but a major source of functional morbidity. The reported data confirm that the complexity of the initial fracture — particularly involving the orbital rims — multiplies the risks of reoperation, with revision rates reaching 14% in complex midfacial fractures. The study emphasizes that complications can be very late, sometimes manifesting years after the initial procedure in the form of fibrosis, cysts, or chronic inflammation.

From a surgical perspective, the coordinated multidisciplinary approach between plastic surgery and oculoplastics appears to be the standard for securing these reinterventions. The systematic use of virtual surgical planning (VSP), 3D models, and intraoperative navigation allows for the correction of contour and volume defects with a precision that conventional surgery struggles to achieve in already scarred tissues. The choice of surgical approach remains predominantly transconjunctival (71.4%), although complex cases often require combined approaches (transfacial, transoral).

Although limited by its small sample size (n=7), this study demonstrates that successful revision relies on a close correlation between imaging (CT/MRI) and patient-reported symptoms. Reducing diplopia and improving globe position are achievable goals, provided the implant is no longer treated as a simple piece of hardware, but as a critical biological interface close to noble structures such as the optic nerve.

Summary of results

The study documents the effectiveness of a multidisciplinary approach combining plastic and oculoplastic surgery to treat orbital implant failures (sizing errors, migration, contact with the optic nerve). The protocol systematically included virtual surgical planning (VSP) and intraoperative navigation for complex cases. The results show that despite the diversity of profiles (ASA I to III comorbidities), precise secondary reconstruction is possible, with a median follow-up of 2.2 months showing a resolution of the initial symptoms.

In concrete terms, for the practitioner:

• Forced duction test: Perform it systematically at the beginning and end of the procedure to validate the total release of the oculomotor muscles.
• 3D Technology: For multi-wall fractures, the use of 3D-printed anatomical models and intraoperative navigation reduces the risk of secondary malposition.
• Synergy of specialties: In case of revision, collaboration with an oculoplastic surgeon is crucial for safe exposure via a transconjunctival approach (71.4% of cases) and the protection of adnexal structures.

Technical lexicon of the study

Virtual Surgical Planning (VSP): Preoperative digital planning process including here the use of mirrored image overlays and 3D-printed anatomical models to guide complex orbital reconstruction.

Forced Duction Testing: Clinical test performed intraoperatively at the beginning and end of the procedure to evaluate the mobility of the four rectus muscles and detect any potential muscle entrapment or tethering.

Hertel Exophthalmometry: Measurement of the position of the eyeball (exophthalmos or enophthalmos) relative to the lateral orbital rim, used to evaluate projection asymmetry between the right and left eye.

Intraoperative Navigation: Use of a real-time guidance system (such as Medtronic StealthStation™) allowing the surgeon to precisely locate instruments in relation to critical anatomical structures and implants on preoperative CT/MRI images.

Transconjunctival Inferior Orbitotomy: Surgical approach passing through the inferior palpebral conjunctiva, preferred in 71.4% of cases in this series to access the orbital floor while minimizing skin scarring.

Heterotopic Bone Formation: Development of newly formed bone tissue in non-bony areas of the orbit, reported as a late complication that can occur years after the initial placement of an orbital implant.

Information for healthcare professionals. This content may contain errors or truncated summaries. We recommend always verifying with the original source article. Delynov disclaims all responsibility regarding the use of this information. This document is not intended for patients or the general public.