Introduction Definition the process of anticipating the size and position of implants prior to surgery Importance allows prediction of implant sizes needed to be available in operating room provides a reliable starting point in determining size and position of implants Accuracy up to 92-100% accurate +/- one size Steps obtain appropriate radiographs analyze radiographs for appropriate planning ensure scale is correct between templates and radiographs template femoral component template tibial component Radiographic Views Necessary radiographs AP weight-bearing radiograph of the knee lateral view of the knee most important view for templating patellofemoral joint view not necessary for templating Optional radiographs full-length hip-to-ankle AP weight-bearing view can be used for templating useful for ruling-out extra-articular deformity estimating coronal laxity planning bony cuts with respect to mechanical axis Magnification 20% is standard most templates account for this magnification markers are helpful Radiographic Analysis Step 1 assess the mechanical axis draw a line of the hip-to-ankle view that shows the overall mechanical axis neutral mechanical axis should bisect the center of knee Step 2 estimate magnitude of coronal deformity measure the tibiofemoral angle Step 3 determine the femoral resection angle difference between mechanical and anatomic axis of the femur Step 4 determine tibial bone cut perpendicular to mechanical axis Step 5 assess bony defects and osteophytes easiest to do on AP weight-bearing view Step 6 assess tibial slope completed on lateral radiograph Step 7 assess patellar height completed on lateral radiograph assess for patella baja this will make exposure more difficult Step 8 assess patellar shift/tilt completed on skyline view of patella Template the Femur Steps choose appropriate implant size on lateral radiograph restore posterior condylar offset avoid notching assess this size component on the AP to determine medial/lateral positioning and ensure no overhang if there is significant overhang, may have to consider downsizing Template the Tibia Steps choose appropriate size based on lateral radiograph ensure no overhang aim to match native tibial slope assess this component size on the AP to determine medial/lateral positioning and ensure no overhang consider downsizing if there is any overhang
Technique Guide Technique guides are not considered high yield topics for orthopaedic standardized exams including ABOS, EBOT and RC. TKA - Parapatellar Approach Derek T. Bernstein Stephen Incavo Recon - High Tibial Osteotomy Technique Guide Technique guides are not considered high yield topics for orthopaedic standardized exams including ABOS, EBOT and RC. TKA with Computer Navigation & Sensor-Guided Assessment for Soft Tissue Balancing - Dr. William Gall William Gallivan Recon - TKA Axial Alignment
QUESTIONS 1 of 1 1 Previous Next This is an AAOS Self Assessment Exam (SAE) question. Orthobullets was not involved in the editorial process and does not have the ability to alter the question. If you prefer to hide SAE questions, simply turn them off in your Learning Goals. (SAE07HK.79) Figure 48a shows the full-leg standing radiograph of a patient with a prior femoral fracture. Figure 48b shows the lateral view of the same joint. The patient is scheduled to undergo total knee arthroplasty. Because the mechanical axis of the lower extremity in patients with a prior femoral fracture may be disrupted, which of the following should be used during surgery to restore the mechanical axis of the lower extremity in this patient? QID: 6039 FIGURES: A B Type & Select Correct Answer 1 Customized components 19% (218/1154) 2 Specialized intramedullary jigs 19% (217/1154) 3 Hinged prosthesis 6% (73/1154) 4 Extra-articular osteotomy 27% (314/1154) 5 Routine knee prosthesis 28% (318/1154) L 5 Question Complexity E Question Importance Select Answer to see Preferred Response SUBMIT RESPONSE 5 Review Tested Concept Review Full Topic
All Videos (1) Podcasts (1) Login to View Community Videos Login to View Community Videos 103rd Annual Alumni Association Meeting Robotics and Soft Tissue Assessment - Seth A. Jerabek, MD Seth A. Jerabek Recon - TKA Templating 12/13/2022 99 views 5.0 (1) Recon ⎜ TKA Prosthesis Design & TKA Templating (ft. Dr. Michael Bolognesi) Team Orthobullets (AF) Recon - TKA Templating Listen Now 23:14 min 10/18/2019 193 plays 3.7 (3)