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The percentage of posterolateral cortical area shielded by fibular head on transverse plane (a) and coronal plane (b). On transverse plane, the percentage was more than 50% (a). Because of the fibular head, it is difficult to reduce the PL fragment and place the buttress plate via a posterolateral approach. AML anterior margin line, PML posterior margin line, POP popliteal tendon, L lateral condyle, M medial condyle
