Different types of Patellar-Femoral prosthesis
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- Marsha Haynes
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1 7th Advanced Course on Knee Surgery : Different types of Patellar-Femoral prosthesis Presenter: Anders Troelsen, MD, ph.d., dr.med., Professor
2 Indications/Contraindications for PF UKA Bone-on-bone OA in the PF joint Preserved cartilage in FT compartments Preserved ligament function No malalignment No inflammatory arthritis No severe instability and/or maltracking..and more depending on the surgeon / study
3 Imaging
4 Choice of implant - history Inlay Vs. Onlay implants = Filling a hole Vs. covering the entire surface
5 Choice of implant - history 1 st Generation PF UKA - characteristics Development in the 1970 s So-called Inlay implants Resurfacing of the trochlea cartilage Rotation according to the native anatomy Narrow components with relative deep grooves Limited proximal to distal coverage Limited assistance from cut/saw guides / free-hand driven
6 Choice of implant - history 1 st Generation PF UKA - problems Mal-tracking Narrow and short implants with too much constraint Catching / Clunking Pain (Crepitus) Instability Unacceptable (high) revision rates
7 Choice of implant - history 2 nd Generation PF UKA - development Complete replacement of anterior compartment ( TKA style ) So-called Onlay implants Broad trochlea flange Valgus angle of groove Extended prox. to distal, sagittal curvature Improved guidance by cut/saw guides PFJ, ZimmerBiomet
8 Choice of implant - history 2 nd Generation PF UKA Biomechanical improvements Improved rotational alignment (despite hypoplasia) M/L: Better support and less need for constraint Q-angle: More physiological tracking (spec. females) P/D: Better engagement of patella in ROM (spec. patella alta)
9 Choice of implant - history 1 st VS 2 nd Generation PF UKA From: Borus T et al. The Knee, 2014.
10 Choice of implant 2 nd Gen PF UKA Complete replacement of anterior compartment, by intrameduallar cutguides Straight forward decisions on setting the rotational alignment All pictures: PFJ, ZimmerBiomet
11 Choice of implant 2 nd Gen PF UKA Size templating for optimal M/L coverage Assessment of direction of patellofemoral track Gude system for accurate bone removal
12 Choice of implant 2 nd Gen PF UKA Assistance from guides throughout the procedure Smooth transition between implant and cartilage Trials for assessment before implantation
13 Choice of implant 2 nd Gen PF UKA
14 Choice of implant 2 nd Gen PF UKA Smooth biomechanics with no catchment of the patella
15 Choice of implant - Results: Changes over time? Ref.: Van der List JP, et al, KSSTA, 2017
16 Choice of implant - Results: 2 nd Gen. PF UKA 2 nd Generation PF UKA Vs TKA Systematic Review in progress: Revision rates have decreased (but are higher than in TKA): 7,5 % revisions. Average time to revision: 36,5 months. Progression of OA / pain is now the most frequent cause (86 %) Highlights that patient selection is important Mechanical problems are rare (4 %) Patient reported outcome similar to TKA for PF-OA: AKSS knee score: 89,2 vs 91,8 (PFA vs TKA)
17 Conclusion Encourage the use of 2 nd Generation implants Look for technical features of the implant and technique Improved results have been achieved Be alert to select the correct patients
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