Use of hydroxyapatite in spine surgery.

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Spinal Fusion Research

Background:

• Hydroxyapatite (HA)-based ceramics are investigated for spinal surgery applications.
• Previous studies utilized animal models and human clinical data.

Purpose of the Study:

• To evaluate the efficacy of HA-based ceramics in various spinal surgery procedures.
• To assess HA ceramics as bone graft substitutes, extenders, and carriers.
• To explore potential applications of injectable HA ceramics.

Main Methods:

• Review of in vivo animal studies.
• Analysis of human clinical series data.
• Evaluation of HA ceramics in interbody, posterolateral lumbar, posterior spinal, and anterior cervical fusions.

Main Results:

• HA ceramics demonstrated efficacy as bone graft substitutes and extenders in animal models.
• Clinical studies confirmed HA effectiveness as a bone graft extender in scoliosis and a substitute in cervical fusions.
• HA functions optimally as an extender or carrier for osteoinductive factors, not as a standalone substitute in nonstructural applications.

Conclusions:

• HA-based ceramics are effective in spinal fusion, particularly as extenders or carriers.
• Injectable HA ceramics show potential for augmenting spinal screw fixation and vertebral strength.
• Further research into injectable HA applications for osteoporotic vertebrae is warranted.