Delayed Cranioplasty: Outcomes Using Frozen Autologous Bone Flaps

Area of Science:

• Neurosurgery
• Surgical Complications
• Bone Reconstruction

Background:

• Decompressive craniectomy for skull defects has high complication rates.
• Autologous cryopreserved bone implantation for cranioplasty shows infection rates up to 33%.
• Factors predisposing to cranioplasty complications remain poorly understood.

Purpose of the Study:

• To identify predisposing factors for complications in patients undergoing cranioplasty with cryopreserved autologous bone flaps.
• To analyze the association between surgical factors and outcomes such as infection and bone resorption.

Main Methods:

• Retrospective review of 187 patients undergoing delayed cranioplasty with cryopreserved autologous bone flaps (1999-2009).
• Data collected included demographics, craniectomy/cranioplasty details, complications, and outcomes.
• Multivariate analysis was used to identify significant risk factors for complications.

Main Results:

• Overall complication rate was 34.2%, with infection (11.2%) and bone resorption (5.35%) being most common.
• Intraoperative cerebrospinal fluid (CSF) leak was significantly associated with infection.
• Longer surgery duration and unilateral cranioplasty site were associated with bone resorption.

Conclusions:

• Cranioplasty with frozen autologous bone is linked to a high incidence of infectious complications.
• Intraoperative CSF leak is a modifiable risk factor that may increase infection risk.
• Minimizing dural or pseudodural breaches during surgery could reduce cranioplasty complications.