Construct length rather than interbody spacer material is associated with reoperation after anterior cervical discectomy and fusion.

Interbody spacer material was not associated with reoperation in this cohort, whereas construct length was.

With 36 events and a confidence interval extending to a 2.2-fold higher hazard, these data represent a null result under limited power rather than evidence of equivalence.

Construct length warrants explicit discussion during preoperative counseling. Spacer material and construct configuration travelled together in this cohort, which has implications for how the existing comparative literature should be read.