Purpose : This retrospective study was designed to compare fusion rate and time to bone fusion using titanium cages filled with β-tricalcium phosphate (β-TCP) and hydroxyapatite (HAp) /collagen composite of patients undergoing anterior cervical discectomy and fusion (ACDF).
Methods : ACDF was performed in 63 patients at one or two levels using titanium cages filled with β-TCP or HAp/collagen composite. Bony fusion was retrospectively assessed via radiography at 3, 6, and 12 months postoperatively.
Results : In the β-TCP group, 18 (95%) of 19 patients showed bony fusion in the last follow-up : six patients (32%) at 6 months postoperatively, and the remaining 12 (63%) at 12 months. In the HAp/collagen composite group, 43 (98%) of 44 patients showed bony fusion at the last follow-up : two (4.5%) at 3 months postoperatively, 27 (61%) at 6 months, and the remaining 14 (32%) at 12 months.
Conclusion : No differences in fusion rate were evident between the β-TCP group and HAp/collagen composite group when observed for 1 year, although the HAp/collagen composite group showed shorter time to bone fusion compared with the β-TCP group.