• Document: Posterior Referencing. Surgical Technique
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® Posterior Referencing Surgical Technique ® Posterior Referencing Surgical Technique INTRO Introduction Instrumentation Successful total knee arthroplasty depends in part on re-establishment of normal lower extremity alignment, proper implant design and orientation, secure implant fixation, and adequate soft tissue balancing and stability. Persona The Personalized Knee System, Posterior Referencing Instruments are designed to help the surgeon accomplish these goals by combining alignment accuracy with a simple, straight-forward technique. The instruments and technique assist the surgeon in restoring the center of the hip, knee, and ankle to lie in a straight line, establishing a neutral mechanical axis. The femoral and tibial components are oriented perpendicular to this axis. Femoral rotation is determined using the posterior condyles, the epicondylar axis or Whiteside’s line as a reference. The instruments facilitate accurate cuts to help ensure robust component fixation. A wide variety of component sizes, shapes and constraint options allow for more optimized component fit and soft tissue balancing. The femur, tibia, and patella are prepared independently, and can be cut in any sequence using the principle of measured resection (removing enough bone to allow replacement by the prosthesis). Adjustment cuts may be needed later. The posterior referencing technique uses the posterior condylar axis to set the A/P position of the femoral component. The cut of the anterior aspect of the femur is variable in 2mm increments offered by the Persona system. Note: The intent of this surgical technique is to explain the surgical steps for posterior reference based on 4-in-1 cut guide selection, hole preparation for placement of 4-in-1 cut guides, and subsequent femoral resections. For the surgical steps of resecting and finishing the tibia and patella, please refer to Persona Surgical Technique (Lit #97-5026-001-00). Refer to Section 12 of the Persona Surgical Technique (Lit # 97-5026-001-00) for final femoral, tibial and patellar implantation. All surgical techniques should be referenced at the time of surgery. INTRO. 1 ® INTRO Posterior Referencing Surgical Technique Magnet Usage Warning: Some instruments in the Persona System contain magnets. All Persona magnetic instruments should be kept at a safe distance from a patient’s active implantable medical device(s) (i.e. pacemaker). These types of devices may be adversely affected by magnets. Instruments containing magnets should be kept on an appropriate table or stand when not in use at the surgical site. Symbols Symbols have been established for the following: • Left M/L • Right Left Right Varus/Valgus Medial/Lateral • Varus/Valgus • Medial/Lateral • Standard Std Do not implant - • Do not implant – Not for implant Standard Not for implant Lock • Lock • Unlock • Anterior Referencing • Do not impact Unlock Anterior Referencing Do not impact • Cemented • Stemmed • Inset Only Cemented Stemmed Inset Only Screw/Pin Information The chart below contains relevant information on various 3.2mm Pins/Screws that are compatible with the Persona system. If these screws/pins are used during the procedure for instrument fixation, they should be removed prior to closure as they are NOT implantable. Compatible Shipped Sterile/ Quantity Single Screw/Pin Screw/Pin Item # Driver Non-sterile per Package use? *Note: The 2.5mm Female Hex Screws and

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