Orthopedic hexapods are effectively used in deformity correction of long bones, midfoot and hindfoot, and improving the functions of large joints. To reduce the hardware bulkiness for deformity correction in children, a minimized Ortho-SUV Frame (OSFm) orthopedic hexapod was developed. OSFm exceeds the standard version of the Ortho-SUV Frame (OSF) in reduction and correction capabilities. The rigidity of bone fragments fixation provided by OSFm has not yet been studied. Aim: compare the osteosynthesis rigidity provided by OSFm with the osteosynthesis rigidity provided by OSF. Bench study was performed using plastic models of the tibia osteotomized at the middle third of the shaft. One-ring modul based on a wire and 2 threaded pins were used to fix bone each bone fragment. The rigidity of osteosynthesis provided by OSFm was studied in the first series of experiments, the rigidity of osteosynthesis provided by OSF was studied in the second series. The response of the assemblies to displacement loads was studied: longitudinal rigidity of osteosynthesis during «distraction» and «compression»; transverse rigidity of osteosynthesis during «abduction», «adduction», «flexion» and «extension»; rotational rigidity of osteosynthesis inward and outward. OSFm is inferior to OSF in terms of longitudinal rigidity by 5.16-5.33 N/mm, transverse rigidity by 3.13-3.5 N*mm/deg, rotational rigidity by 2.27-2.73 N*mm/deg. Indicators of osteosynthesis stiffness provided by OSFm are not significantly inferior to those of OSF. This justifies the use of OSFm in clinical practice.