Anterior spinal instrumentation augmented with PMMA becomes a procedure of choice to restore immediate spinal function for spine metastasis. Several instrumentation systems are available for use. None of the devices, however, is entirely satisfactory. The metal or ceramic implant most commonly used is of fixed height necessitating a partial resection of the intact vertebral bodies for proper accommodation. A biomechanical evaluation of these devices is also lacking. For these reasons, a new spinal implant was developed and tested at our laboratory. The implant consists of two 'rectangular' tubes that can slide with respect to one another. The sliding feature allows for adjusting the height of the implant. The device was tested for its effectiveness in preventing motion across the stabilized segment during the physiological range of motion of the ligamentous specimens. A Selspot II motion measuring system was used for obtaining the three-dimensional load-displacement behavior of various vertebrae of the intact specimen and the stabilized specimen.