Morphomechanical alterations in the medial gastrocnemius muscle in patients with a repaired Achilles tendon: Associations with outcome measures.

•Morphological changes and mechanical properties in the calf muscle were measured.•There are muscular adaptations of a leg within 6months of an Achilles tendon repair.•The morphomechanical features correlate with performances in the lower extremities.•The morphomechanical alterations should be monitored during functional restoration.