Comparison of Clinico-radiological Outcomes of Monolateral Fixator in Infected Non-union of Tibia Based on Bone Gap Quantification

Introduction Monolateral rail fixators are more comfortable to the patients and have a lesser learning curve compared to ring fixators. Guidelines are still lacking for rational use of monolateral fixator for bone transport. This retrospective study aimed to analyze and compare the clinico-radiological outcomes of monolateral fixator in infected non union of tibia based on bone gap quantification. Materials and Methods This retrospective study included 35 patients of post traumatic infected osteocutaneous defects of tibia operated from May 2013 to May 2016. Group I having bone gap of 6 cm or less (n = 20) and group II with > 6 cm bone gap (n = 15). The mean age was 29.56 (range 18-62) years in group I and 29.67 (range 20-65) years in group II. The mean bone gap was 4.62 (2-6 cm) in group I and 7.6 cm (6.5-10 cm) in group II (P < 0.00001, Mann-Whitney test). The results were assessed by Association for the Study and Application of the Method of Ilizarov (ASAMI) criteria. Results Union was achieved primarily in 90% (n = 18) cases in group I and 73.34% (n = 11) cases in group II. The bone result was excellent, good, fair/poor in 14, 5, 1 in group I; and in 4, 6, 5 in group II, respectively (P = 0.020, Chi-square test). The functional results were excellent, good, fair/poor in 15, 4, 1 in group I; and 5, 8, 2 in group II, respectively (P = 0.0479, Chi-square test). Conclusion We recommend use of monolateral fixator in patients with infected diaphyseal non union of tibia with bone gap <= 6 cm. Use of monolateral fixator in patients with bone gap > 6 cm is associated with higher incidence of residual problems and complications.