AORI Classification
Type 1 - Minimal bone defect, intact metaphysis
- Treat with cement or impaction grafting
Type 2A - Metaphyseal bone damage of 1 femoral condyle (F2A) or 1 half of the tibial plateau (T2A); posterior condyles are reduced
- Treat with cement, augments, bone graft, cones/sleeves
Type 2B - Metaphyseal bone damage of bone femoral condyles (F2B) or both sides of the plateau (T2B)
- Treat with cement, augments, bone graft, cones/sleeves
Type 3 - Massive bone loss of large portion of the condyles and/or plateaus; can involve the collaterals and/or patellar tendon
- Treat with allograft, custom implants, sleeves/cones/augments, hinge, DFR
A Classification of Bone Defects, In: Revision Knee Arthroplasty. 1997 p 63-120
Engh and Ammeen
1. Classification and Pre-operative Radiographic Evaluation. Ortho Clinics N. Amer 1998 Apr; 29(2) 205-17.
2. Classification and Alternative for Reconstruction. ICL 1999, 48: 167-175.