Disintegration of porous polyethylene prostheses

Area of Science:

• Otolaryngology
• Biomaterials Science
• Surgical Pathology

Background:

• The use of porous polyethylene prostheses, such as Plastipore, for total ossicular replacement has been a common surgical technique.
• These implants aim to restore hearing by reconstructing the middle ear ossicular chain.
• Long-term outcomes and potential material degradation are critical considerations for implantable devices.

Observation:

• A patient received a Plastipore Total Ossicular Replacement Prosthesis, achieving excellent initial hearing results.
• Hearing function was maintained for a period of 14 years post-implantation.
• Subsequently, a progressive deterioration in hearing occurred, necessitating revision surgery.

Findings:

• Revision surgery identified significant disintegration of the porous polyethylene prosthesis.
• A defect was observed in the stapes footplate during the revision procedure.
• Histological examination confirmed material breakdown and the presence of multinucleated foreign body giant cells, consistent with foreign body reactions to the polyethylene material.

Implications:

• This case highlights the potential for long-term degradation of porous polyethylene ossicular implants.
• The findings suggest that material failure can lead to secondary hearing loss and necessitate revision surgery.
• Further research into the biocompatibility and long-term stability of middle ear prostheses is warranted to improve patient outcomes.