Transcript UKA to TKADr Ahadi.pptx

Converting UKA to TKA
Keivan Ahadi
Knee Surgeon
Isfahan,Jan 8th 2016
Failure Mode
• Instability
• Loosening
• Poly wear/osteolysis
• Progressive osteoarthritis
• Infection
• Fracture
Pre-operative planning
UKA to TKA
• Conversion can be difficult
• May require revision component
• Dictated by level of bone loss and ligamentous instability
• Increased complexity by Tibial fracture,specific Uni designs
Avoid
Unexplained Pain
Always R/O Infection
Before Revision
Technical Points
• Make distal femoral cut with femoral component retained
• Avoid over resection
• Maintain extension gap
• Femoral bone defect is rarely a problem
• Avoid over resection of tibia
Technical Point
• Posterior condylar axis is not a good index for femoral component
Rotation because of posteromedial deficiency
• Other tools:
Transepicondylar axis
Whiteside line
Amount of bone defect and Ligamentous
Stability
• Normal TKA, PS or CR
• Cement,screw for tibial bone defects
• Augments and stems
• Constrained prosthesis
• Sometimes only Poly exchange is enough
Conversion UKA
to TKA
ICJR Cleveland
Arthroplasty Course 2011
Featuring
Robert Molloy
‫سپاسگزارم‬