Drawing upon this experience, the SPS off the shelf system was designed and developed from this vast databank of CT scans, offering the means of mapping both the intramedullary and extramedullary characteristics of the femur in order to optimise the fit and fill principle of the anatomic design criteria. Mouttet, whose experience with the SPS stem began in 1993, reported a survivorship rate of 98.8% at 5 years in 176 patients (data on file).
In order to facilitate the restoration of the exact various hip parameters, including centre of rotation, offset, range of motion, minimising the risks of impingement, an evolution of the anatomic SPS prosthesis is now available as a multi- modular trunion/ cone option- The SPS Modular Prosthesis (Special Prosthesis from Symbios), the exact same stem geometry as the SPS anatomic stem reported above being faithfully maintained. The rational behind the development of femoral components with ante/ retro, varus/ valgus modular exchange allows many of the features of a CAD prosthesis to be captured in a convenient and affordable off the shelf offering.
The SPS Modular stem in combination with Metal/ Metal or Ceramic/ Ceramic large hard bearing surfaces reflect current thinking behind optimal tribology young active patients. The operating surgeon is thus presented with unprecedented choice as he strives to reconstruct the joint.