Figures A, B, and C are the MR images of an abnormal tendon that is most important during which stage of the gait cycle?

The radiograph is of a 58-year-old woman who has a painful hallux. She has pronation of the great toe upon standing, tightness of the adductor halluces, painless first metatarsophalangeal (MTP) range of motion, and pain at the first tarsometatarsal (TMT) joint.

Figures 31a through 31c are the MR images of an abnormal tendon that is most important during which stage of the gait cycle?