3 An insole must bear the often-extreme loads 3, 8, 9 in athletes. 1–10 These severe accompanying phenomena make ordinary life miserable and are why a person seeks professional help. Pain in the lower limbs and muscle fatigue are characteristic symptoms of flat feet. In general, the main principle in the design of CMI is the correction of deformities, 1, 3, 7–9 reductions of painful symptoms, 3–10and adequate load distribution. 1, 3–5, 7, 15, 21, 27, 28 It follows from the above that a fundamental assumption for the successful designing CMIs is to understand the correlation of the foot to posture 29 and other aspects of the musculoskeletal system, 1, 3–9 to perceive relationships to associated diseases and cognition of the biomechanics, 1, 4, 5, 12 weight-bearing activities 1, 3, 5–7, 9 of humans, and pathological forces 1, 3, 5–7, 13 which affect the foot. The production of a CMI that meets the biomechanical requirements for damping and support is demanding from material and mechanical points of view, knowledge, and skills. 2 They are responsible for diagnosis establishing, 2 and defining the correction elements on the insoles. 1–28 Only orthopedic physicians and podiatrists can prescribe CMIs. Custom-made Orthopedic Insoles (CMIs) are an ordinary conservative solution to the complications associated with pes planus (flatfoot).
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