Stress analysis of the interface between cervical vertebrae end plates and the Bryan, Prestige LP, and ProDisc-C cervical disc prostheses: an in vivo image-based finite element study.

Study Design: Segmental motion and bone-implant interface stresses were analyzed at C5-C6 levels with Bryan, Prestige LP, and ProDisc-C cervical disc prostheses using an image-based finite element modeling technique.

Objective: To predict stress patterns at the interface between prosthesis and lower vertebral end plate to better understand the underlying mechanisms of subsidence and how the load transfer pattern of each disc design affects segmental motion.

Summary Of Background Data: Subsidence is one of the most commonly reported device-related complications in intervertebral disc arthroplasty.

Bone ingrowth in retrieved Bryan Cervical Disc prostheses.

Study Design: Explant analysis for bone ingrowth of retrieved cervical disc prosthesis in chimpanzees and humans.

Objectives: To assess the bone ingrowth into retrieved Bryan Cervical Discs.

Summary Of Background Data: Bone ingrowth in cervical disc prosthesis has not been documented in the literature.

Kinematic analysis of the cervical spine following implantation of an artificial cervical disc.

Study Design: Prospective cohort study.

Objective: To assess the biomechanical profile of the cervical spine following cervical arthroplasty.

Summary Of Background Data: Spinal arthroplasty offers the promise of maintaining functional spinal motion, thereby potentially avoiding adjacent segment disease.

Intervertebral disc arthroplasty.

Study Design: Review article of current knowledge of disc arthroplasty.

Objectives: To review the rationale for disc replacement, the general principles of design, and early clinical results.

Summary Of Background Data: Disc arthroplasty is an emerging treatment for patients with disc degeneration.

The Bryan Cervical Disc: wear properties and early clinical results.

Background Context: The rationale for motion preservation by disc replacement after anterior cervical discectomy is to diminish long-term morbidity secondary to adjacent segment degeneration. However, these disc prostheses will be subject to wear and its possible adverse consequences.

Purpose: Assess the in vitro and in vivo wear properties of the Bryan Cervical Disc and the early clinical results.

A comparison of simulator-tested and -retrieved cervical disc prostheses. Invited submission from the Joint Section Meeting on Disorders of the Spine and Peripheral Nerves, March 2004.

Object: Total joint arthroplasties most commonly fail because the implant becomes worn and a host inflammatory response subsequently develops. Both the material response to the biological environment and the host response to the device must be thoroughly evaluated to establish the efficacy of cervical arthroplasty. Analyses of devices explanted in humans allow evaluation of both responses.

Wear analysis of the Bryan Cervical Disc prosthesis.

Study Design: In vitro wear testing of the Bryan Cervical Disc prosthesis was performed in a cervical spine simulator. The biologic response was assessed in chimpanzee and goat animal models.

Objective: Determine the wear characteristics of the Bryan disc.