A variety of lumbar total disc replacement (TDR) designs exist for the treatment of disc pathologies and several of which have undergone clinical trials. A key design parameter for a constrained ball and socket type device is a fixed center of rotation (CoR). A previous study [1] demonstrated that the lumbar motion segment unit (MSU) was highly sensitive to the anatomical location of the sagittal plane rotational axis. Malalignment between the implant CoR and the inherent rotational axis of the MSU may lead to an overloaded or over-constrained condition.

This content is only available via PDF.
You do not currently have access to this content.