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A 4 months and half female child come to our attention for congenital dislocation of the left hip, previously treated in another hospital with abduction bracing, without satisfactory results. After progressive longitudinal bilateral traction, closed reduction under general anesthesia was performed and a spica cast was applied in the so-called human position. The patients remained in the spica cast for 6 weeks and then the plaster cast was renewed in narcosis for another 6 weeks. Once the second cast has been removed left femoral nerve palsy was detected. Orthopaedic treatment was interrupted and in 3 months the nerve completely recovered, while the hip was still stable. We followed the child regularly since then, she is now five years old, she is totally asymptomatic, X-rays shows a residual acetabular dysplasia, with no sign of avascular necrosis.