Might be a sign of: Gout Gout is an inflammation caused by a buildup of uric acid that forms crystals in the joints. Bruising and swelling suggests a sprain or fracture. In the weight-bearing leg it acts similar to the tibialis anterior. An underpronator's arches or ankles don't experience much motion as they cycle through the gait.
Both these muscles are inserted with two heads proximally and distally to the first metatarsophalangeal joint. During walking it not only lifts the heel, but also flexes the knee, assisted by the plantaris. Are my feet killing me?