Abstract
INTRODUCTION AND IMPORTANCE: Achondroplasia, a prevalent skeletal dysplasia, often results in limb asymmetry and functional limitations, typically managed surgically with bone lengthening techniques. CASE PRESENTATION: We present the case of a 10-year-old girl with achondroplasia who underwent bilateral humeral lengthening using hexapod external fixators. The patient, previously treated for lower limb lengthening, exhibited significant upper limb shortening affecting daily activities. Surgical intervention involved two stages, employing two hexapod external fixators for precise correction and lengthening. Symmetrical lengthening of 6 cm in both humeri was achieved without major complications. Follow-up assessments revealed improved functionality and satisfactory outcomes, emphasizing the importance of addressing upper limb deformities in achondroplasia patients. CLINICAL DISCUSSION: While humeral lengthening is less common than lower extremity lengthening due to historical concerns about neurovascular complications and functional implications, recent advancements highlight its potential benefits, particularly in achieving functional and aesthetic balance. CONCLUSION: This case highlights the efficacy and safety of hexapod fixators in achieving multiplanar correction and functional improvement in upper limb lengthening. Further investigation should be carried out to study broader application in similar cases.