A method of surgical treatment of midshaft clavicular fractures and a compression interlocking nail for osteosyn thesis of the clavicle were developed. Strength characteristics of various bone − implant − bone systems in osteosyn thesis of midshaft clavicular fractures were compared. It was shown that none of the tested fixation techniques provides stability under conditions of axial loading comparable to that of an intact clavicle. The developed design can be recommended as a method of choice for osteosynthesis of midshaft clavicular fractures, as it demonstrat ed strength characteristics comparable to those of other systems.