Orthopaedic Simulation of Morton's Extension to Test the Effect on Plantar Pressures of Each Metatarsal Head in Patients Without Deformity: A Pre-post-test Study.

Inclusion Criteria: * no history of trauma to the foot; * the presence of at least 10° of dorsiflexion at the ankle with the knee fully dorsiflexed; * unrestricted motion of the functional subtalar joint of 30°; * unrestricted motion along the longitudinal axis of the midtarsal joint of 15°; * unrestricted nonweight-bearing motion of the first ray of at least 8 mm; * greater than 50° of dorsiflexion of the hallux to the first metatarsal bisection during nonweight-bearing; * age greater than 18 years and younger than 60 years; * at the time of data collection, no lower limb dysfunction or chronic injury; and * no evidence of a non-fixed deformity at first MTP and first metatarsal cuneiform joints. Exclusion Criteria: * plantar corns and calluses, * hallux valgus and lesser toe deformities, * diabetes, * any abnormality in the lower extremity that may affect gait.