Use of a hydroxyapatite orbital implant in a cosmetic corneoscleral prosthesis after enucleation in a horse.

This research focused on the successful use of a hydroxyapatite orbital implant for a cosmetic corneoscleral prosthesis following enucleation (eye removal) in a horse, showcasing that this implant could be a more effective alternative to methylmethacrylate or silicone spheres, which have been associated with several complications such as extrusion, infection, and unappealing results.

Objective of the Research

• The objective of this study was to explore the viability of using a hydroxyapatite orbital implant for a cosmetic corneoscleral prosthesis following the removal of an eye in a horse and compare its effectiveness with traditional synthetic spheres made from methylmethacrylate or silicone.

Hydroxyapatite Orbital Implant Procedure

• A 5-year-old performance horse had an eye removed, after which a hydroxyapatite orbital implant was inserted.
• A tailor-made corneoscleral prosthesis was developed and fitted over the hydroxyapatite implant. This prosthesis was aimed to provide a cosmetic replacement for the lost eye to allow the horse to continue to compete.

Benefits of Hydroxyapatite Orbital Implants over Synthetic Spheres

• Often, synthetic spheres consisting of methylmethacrylate or silicone are used in these procedures. However, they have been linked with many complications such as extrusion, infection, and unsatisfactory cosmetic outcomes.
• Alternatively, hydroxyapatite orbital implants—made from marine coral—allow vascular and fibrous tissue growth from the host orbit into the implant. This reduces the risk of implant extrusion or infection and encourages the healing of defects in the overlying conjunctiva.
• The fixation of extraocular muscles onto the implant can allow movement and aid in preventing implant extrusion.

Results And Conclusion

• In this study, both the implant and surgical procedures were well tolerated by the horse. This suggests that hydroxyapatite orbital implants can serve as an effective solution for horses requiring eye removal and subsequent cosmetic replacement.