Zimmer Biomet Persona Manual

Also see for Persona: SURGICAL TECHNIQUE

Zimmer Biomet Persona Manual Manual pdf 30 page image

28 | Persona The Personalized Knee Surgical TechniqueFemur Caliper00-5903-030-003.2 mm Drill00-5120-085-001. Depress Collar2. Rotate CollarPrepare the PatellaIf the surgeon determines that the condition of thepatient's patella is satisfactory, it is not necessaryto resurface the patella. The geometry, depth, andlength of the patella groove on the Persona FemoralComponent accommodates the unresurfaced patella.Technique Tip: These instruments are designed foronlaying all-poly patella only.Place the leg in full extension, evert the patella toat least 90 degrees. Stabilize the patella, using twoinverted towel clips. Incise the soft tissue aroundthe patella down to the insertion of the quadricepsand patellar tendons. Before making any bone cuts,determine the maximum thickness of the patella byusing the femur caliper to measure the most prominentanterior-to-posterior dimension (Figure 58).Technique Tip: The femur caliper has a tolerance of± 0.25 mm.Resect the PatellaPlease refer to the appropriate surgical technique ifother patella instrumentation is to be used to resectthe patella.Refer to the sizing chart for patella dimensions(Figure 59). Use a 3.2 mm drill to drill the highestportion of the medial facet perpendicular to thearticular surface approximately 12 mm deep centeredon the medial sagittal ridge (Figure 60). This acts as aguide for proper medialization of the patella.Use the patella osteotomy guide with the stylus set forthe desired amount of resection. Depress the buttonon the stylus while twisting to set the stylus at thedesired resection level (Figure 61). If the patella is veryworn, resect less bone.Technique Tip: Assure that the patella osteotomyguide stylus is referencing the most prominentpoint on the patella before resecting.Technique Tip: At least 10 mm of bone must remainto ensure that the pegs of the patella implant do notprotrude through the anterior surface (see image).Figure 58Figure 61Figure 59Persona Standard Implant Patella Size & Thickness26 mm x 7.5 mm*29 mm x 8.0 mm**32 mm x 8.5 mm**35 mm x 9.0 mm38 mm x 9.5 mm41 mm x 10.0 mmFigure 60* The 26 mm patella must always be inset.** The 29 mm and 32 mm patellae must be inset when used with sizes10–12 Persona PS femoral components.See package insert for complete details.