Exactech Acapella One Interbody Fusion Device Parallel. Orthopedic Spinal Surgery Device. || Product Usage: The Acapella One Cervical Spacer System is indicated for anterior cervical interbody fusion procedures in skeletally mature patients with degenerative disc disease at one disc level from C2-T1. Is to be used with autogenous bone graft and supplemental internal fixation and is implanted via an open anterior approach.