Size of rings according to soft tissue oedema after injury (minimum +2.0 cm);
stability of fixation of bone fragments;
possibility of their movement by fixator;
low invasiveness of surgical intervention;
possibility of early weight-bearing on affected limb;
Tarchokov VT, Leonchuk SS. Ilizarov Technique in Acute Ankle Trauma: A Report of Four Cases. Emerg Med (Los Angel) 2017;7:352. doi:10.4172/2165-7548.1000352
Rodriguez E. et al. Ilizarov method of fixation for the management of pilon and distal tibial fractures in the compromised diabetic patient: A technique guide. The Foot and Ankle Online Journal 7(2):6. doi: 10.3827/faoj.2014.0702.00
Design parameters of conventional used tubular - pin based or circular -wire based external fixates is well established and in use for since their inception to current date.
The design parameters of newer frames like Taylor spatial frames that utilise software - computer guided functioning and adjustments are different and specific books or articles can be searched in this regard.