The aim of this study is to simulate the orthopedic treatment called Morton's extension on flat foot patients to check balance effects in standing position.

The objective of this study is to perform an assimilation of the orthopedic treatment called morton extension on flat foot patients to verify the balance with stabilometry study.

Inclusion Criteria:

• Women and men aged 18 to 30 with flexible flat feet.

Exclusion Criteria:

• Participants who have had any previous limb surgery, and/or previous lower limb trauma within the last year
• Uncorrected hearing or visual impairment.
• Lumbar pathology with radicular involvement.
• Pregnancy.
• Healthy participants performing strenuous exercise.
• Diagnosed active or inactive rheumatic or inflammatory disease.
• Participants consuming alcohol within 24 hours prior to recording or stimulants 6 hours prior to testing (e.g. caffeine).
• Participants who have a history of injury with residual lower extremity symptoms within the past year.
• Participants with evidence of a leg length discrepancy (difference in distance from the anterior superior iliac spine to the superior iliac spine at the surface of the most prominent aspect of the medial malleolus) of more than 1 cm 19
• Having at least 15 degrees of ankle dorsiflexion.
• Participants with evidence of balance deficit, as determined through oral questioning about falls and by use of the Balance Evaluation Systems Test (BESTest).
• Participants with neurological pathology with lower limb deformities, sensory-motor disturbances, neuromuscular pathology, or neurovascular disease.