The Use of Structural Allograft in Primary and Revision Knee Arthroplasty with Bone Loss

Table 1

Classification of femoral and tibial bone loss [1].

(a) AORI femoral bone loss classification

AORI femur grade	Deficit	MCL/LCL	Bone reconstruction
F1	Intact metaphyseal bone	Intact	Cement or particulate graft
F2a	Metaphyseal loss single condyle	Intact	Cement or metal augment
F2b	Metaphyseal loss both condyles	Intact	Cement, metal augment or structural graft
F3	Deficient metaphysis	Compromised	Structural allograft or segmental replacement

(b) AORI Tibial Bone Loss Classification

AORI tibial grade	Deficit	MCL/LCL	Bone reconstruc- tion
T1	Intact metaphyseal bone	Intact	Cement or particulate graft
T2a	Metaphyseal loss med or lat Plateau	Intact	Cement or metal augment
T2b	Metaphyseal loss and lat plateau	Intact	Cement, metal augment or structural graft
T3^⋆	Deficient metaphysis	Compromised	Structural allograft or segmental replace- ment

⋆Possible extensor mechanism compromise.