Fig. 2From: Talonavicular joint mobilization and foot core strengthening in patellofemoral pain syndrome: a single-blind, three-armed randomized controlled trialVastus medialis/vastus lateralis VM/VL muscle activities ratio. A Before stair ascent. B Ascending a stair with the affected leg. C After stair ascent. The maximum value is the ratio of the root mean squares of the vastus medialis and vastus lateralis while ascending the stairBack to article page