Stryker Orthopaedics Patella Assembly Instrument, REF 3182-1000, Non-Sterile, NDC (01) 07613327215854 (10) || The Scorpio Patella Assembly Instrument is used during total knee replacement surgery for the implantation of Scorpio Patella implant components. The device functions to fully seat the implant onto the bone and secure it in position while the surgeon removes any excess cement and when cement polymerization occurs.