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Updated: May 19, 2026
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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
[Fracture of macroporous hydroxyapatite prosthesis]
A T Adetchessi1, G Pech-Gourg, P Metellus
1Service de neurochirurgie, hôpital la Timone Adulte, 264, rue Saint-Pierre, 13385 Marseille cedex 5, France. agona.adetchessi@ap-hm.fr
Neuro-Chirurgie
|August 18, 2012
Summary
Cranioplasty using hydroxyapatite implants after decompressive craniectomy can fracture during seizures. Polyether ether ketone (PEEK) implants are recommended for patients prone to head impacts due to their superior mechanical strength.
Area of Science:
- Neurosurgery
- Biomaterials Science
Background:
- Decompressive craniectomy is a life-saving procedure for severe head trauma.
- Autologous bone grafts are not always viable for subsequent cranioplasty.
- Prosthetic implants offer an alternative for skull reconstruction.
Observation:
- A 25-year-old patient underwent cranioplasty with a hydroxyapatite implant after decompressive craniectomy.
- The patient experienced a generalized seizure, resulting in head trauma and comminutive fracture of the hydroxyapatite prosthesis.
- An extradural hematoma was also identified, necessitating implant removal and clot evacuation.
Findings:
- Hydroxyapatite implants, while possessing bone-like properties, exhibit insufficient mechanical resistance.
- This weakness poses a significant risk in patients susceptible to seizures and subsequent head impacts.
- A subsequent cranioplasty with a polyether ether ketone (PEEK) implant was successfully performed.
Implications:
- For patients undergoing decompressive craniectomy who are at risk of head injury, PEEK implants are favored over hydroxyapatite.
- The selection of cranioplasty materials must consider patient-specific risks, such as seizure activity.
- This case highlights the importance of mechanical integrity in prosthetic implants for cranioplasty.
