The knee is one of the most commonly rated joints in VA disability. It can be rated under multiple diagnostic codes simultaneously under VAOPGCPREC 23-97 and VAOPGCPREC 9-98. For example, a veteran can receive separate ratings for limitation of flexion (DC 5260), limitation of extension (DC 5261), AND instability (DC 5257) for the same knee.
Per M21-1, Part IV.ii.2.A, the DeLuca factors (pain, weakness, fatigability, incoordination) must be considered. Per Sharp v. Shulkin (2017), examiners must estimate ROM during flare-ups. Per Correia v. McDonald (2017), active, passive, and weight-bearing ROM must be tested. Each knee is rated independently and the bilateral factor under 38 C.F.R. § 4.26 applies when both knees are rated.
Under 38 C.F.R. § 3.310 | Per M21-1, Part IV.ii.1.C