Keivan Ahadi Knee Surgeon Isfahan,Jan 8th 2016 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

ICJR Cleveland Arthroplasty Course 2011 Featuring Conversion UKA to TKA ICJR Cleveland Arthroplasty Course 2011 Featuring Robert Molloy

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