Adult flat foot valgus is a degenerative pathology that causes damage to the ligaments of the hindfoot as well as dysfunction of the tendon of the posterior tibial muscle.

Currently, there is a lack of a tool allowing a standardized, reliable, reproducible and validated measurement of the strength of the tendon of the posterior tibial muscle in consultation of foot surgery.

The hand-held dynamometer could be that tool. The study would consist in measuring the strength of the tendon of the posterior tibial muscle in healthy subjects with a hand-held dynamometer (MicroFET2) by two examiners and compared to isometric reference measurements (CON-TREX CMV Multi-Joint) to validate the reliability of the measurement and its reproducibility.

Inclusion Criteria:

• Patients from physical medicine and rehabilitation department hospitalized for pathologies other than neurological or osteo-articular pathologies affecting the lower limbs,
• Having no neurological or osteo-articular pathology affecting the lower limbs f one year,
• No history of surgery on the rear foot and ankle,
• Written informed consent from person,
• Socially insured patient person,
• Person willing to comply with all study procedures and study duration.

Exclusion Criteria:

• Neurological or osteo-articular pathologies affecting the lower limbs,
• Known pathologies of the tendon of the posterior tibialis muscle,
• Deformations of the foot (flat foot, hollow foot),
• History of hindfoot or ankle surgery,
• Pregnant or breastfeeding woman,
• Inability to receive information, consent and participate in the whole study,
• Person under judicial protection or deprived of liberty,
• Person participating in another clinical trial,
• No social insurance cover,
• No written consent.