Case Series to Evaluate Patient Specific Implants (PSI) in Polyether Ether Ketone (PEEK) Performance After 2 Years

Inclusion Criteria: * Males or females age 18 years or over at the time of inclusion into the study * Received a Synthes PSI® made of PEEK intended for replacement of bony voids in the cranial/craniofacial skeleton at least 24 months before inclusion in the study * Ability to obtain written informed consent from the recipient or the recipient's legal guardian * Ability to comply with the procedures described in the protocol, including responding to simple questionnaires either by the recipient in person or by a next relative (spouse, parent) who lives with the recipient Exclusion Criteria: * Patient was contraindicated to receive a PSI made of PEEK at the time of implantation