Scale) ≤ 4 5-7 ≥ 8 - Nature of the lesion Blastic Mixed Lytic - Size of the lesion < 1/ 3 of cortex 1/ 3 - 2/ 3 of cortex > 2/ 3 of cortex - Site of the lesion Upper limb Lower limb Trochanteric region - Mirels H. Clin Orthop 1989 - Muhammad Umar Jawad. Clin Orthop Relat Res 2010 Mirels' score Fracture risk Clinical recommendation ≤ 7 Radiotherapy and observation = 8 = 15% Use clinical judgement ≥ 9 ≥ 33% Prophylactic fixation Prise en charge des métastases osseuses des os longs par le chirurgien orthopédiste