Outcomes of Varus Derotation Femoral Osteotomy By Angle Blade Plate in Legg-Calve-Perthes Disease for Patient Above Eight Years of Age in The Lateral Pillar B or B/C Group.

Legg-Calve-Perthes disease (LCPD) that starts after 8 years (late onset) usually follow more aggressive course and the long-term outcome is also poor. Treatment method of LCPD that will produce best results is controversial particularly if the patients are with late-onset presentation. This prospective study was conducted from January 2015 to January 2019 at Dhaka Medical College Hospital and Health N Hope Hospital, Dhaka, Bangladesh. We evaluated the radiographic outcomes for patients who had varus derotation femoral osteotomy (VDRO). We followed up 16 patients who had femoral varus osteotomy. All patients were above 8 years of age at clinical onset. The involvement of femoral epiphysis was in either in B or B/C in lateral pillar classification. All patients had MRI done to confirm radiological diagnosis and classification. The mean age was 9.5 years (range, 8 to 12 years). Final outcome was evaluated by using the Stulberg classification which was radiological. Important exclusion criteria were patient with bilateral involvement and requirement of femoral varus >30 degree. We had 81.25% of our patient with satisfactory outcomes. Among them there were Stulberg grade I, 0 cases; Stulberg grade II, 13 cases (81.25%); Stulberg III, 3 cases (18.75%), Stulberg IV and V both 0 case each. The surgical outcomes for varus derotation femoral osteotomy in late onset LCPD patients over 8 years old were showing the good results than other modalities of non surgical and surgical methods.