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FOPE zones were identified on routine MRI ex-. aminations of the knee performed for acute or chron -. ic pain in 12 patients (seven girls and five boys; age. range, 11 years 9 monthsâ15 years 8 months); the MR. examinations were collected over 5 years (March. 2005âFebruary 2010). Patient history was obtained.
H zone The H zone is the region in the middle of the sarcomere where the thin myofilaments fail to overlap the thick myofilaments. M line The M line in the center of the sarcomere and A band is where proteins hold the thick myofilaments in position.he skeletal muscle fibers contract when the sarcomere in the myofibrils contract. The contraction of the sarcomeres is explained by the sliding filament theory. (The word theory is used here in its scientific sense as meaning generally accepted laws and principles, as in the theory of evolution.).