Ahlbach Classification

Radiological Classification of OA Knee as given by Ahlbach is based on AP weight bearing and lateral views of knees :

type 1 – Joint space narrowing

type 2 – Total loss of joint space

type 3 -<5mm tibial erosion but posterior part of the plateau intact

type 4 – >5mm tibial erosion and erosion of posterior plateau

type 5 – Subluxation

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