Zimmer Biomet Persona Manual

Also see for Persona: SURGICAL TECHNIQUE

Zimmer Biomet Persona Manual Manual pdf 4 page image

2 | Persona The Personalized Knee Surgical TechniqueSurgical TechniqueSuccessful total knee arthroplasty depends in part onre-establishment of normal lower extremity alignment,proper implant design and orientation, secure implantfixation, and adequate soft tissue balancing andstability. Persona The Personalized Knee is designed tohelp the surgeon accomplish these goals by combiningalignment accuracy with a simple, straight-forwardtechnique.The instruments and technique assist the surgeon inrestoring the center of the hip, knee, and ankle to liein a straight line, establishing a neutral mechanicalaxis. The femoral and tibial components areoriented perpendicular to this axis. Femoral rotationis determined using the posterior condyles, theepicondylar axis, or Whiteside’s line as a reference.The instruments enable accurate cuts to ensure robustcomponent fixation.A wide variety of component sizes, shapes, andconstraint options allow for optimized component fitand soft tissue balancing. The femur, tibia, and patellaare prepared independently, and can be cut in anysequence using the principle of measured resection(removing enough bone to allow replacement by theprosthesis). Adjustment cuts may be needed later. Theanterior referencing technique uses the anterior cortexto set the A/P position of the femoral component. Theposterior condyle cut is variable.Constraint OptionsThe degree of constraint of the bearing can beplanned based on surgeon preference and patientrequirements. The use of the cruciate retaining (CR)femoral provisionals and components can be used witheither a CR or Medial Congruent® (MC) bearing whenthe posterior cruciate ligament (PCL) is intact.The CR femoral provisionals and components canbe used when the PCL is sacrificed or deficient andremoved, if used with either a MC or ultracongruent(UC) bearing provisionals and components.Also, posterior stabilized (PS) femoral provisionals andcomponents can be used with the PS or constrainedposterior stabilized (CPS) bearings provisionals andcomponents when the PCL is deficient and removed.PS femoral components cannot be used with CR, MC,or UC bearings and CR femoral components cannot beused with PS or CPS bearings.The CPS bearings can be used to provide moderatevarus\valgus constraint in patients to facilitate softtissue balance and stability. The CPS bearings shallbe used with cemented non-porous femoral and tibialcomponents only. Additional information for thisproduct may be found in the Constrained PosteriorStabilized (CPS) Surgical Technique (97-5026-072-00).The MC, UC, PS, and CPS implants can be used inthe following situations, depending on the degreeof the deformity, the stability of the ligaments, andthe quality of the bone. The surgeon is responsiblefor assessing whether a more constraining implant/system or revision implant/system is necessary.1. Marked valgus deformity – requiring PCLand lateral soft tissue release.2. Prior high tibial osteotomies – soft tissuebalancing is the same as for a valgus deformitywith lateral soft tissue and PCL release.3. Patellectomy – PCL incomplete or absent.4. Most revision situations – PCL deficientor nonfunctional.Introduction