“…In some cases, the muscle occupies the radial insertion of pronator quadratus and causes hypoplasia of the pronator muscle. 3,4 The FCRB tendon usually passes beneath the FCR tendon and has various sites of insertion, such as the second, third or forth metacarpal, trapezium, and capitate. [1][2][3][4][5] The FCR and FCRB tendons were found in the same compartment in all studies.…”