Lower limb deformity is defined as deviation of the normal alignment or orientation of the affected limb1,2. Pre-operative planning for deformity correction involves identification of the cause of deformity, be it from the bone (femur or tibia), the joint (hip, knee or ankle) or both the bone and joint involvement. Nowadays, malalignment and malorientation test, described by Paley et al, is routinely being used in pre- operative planning to delineate and identify the pathological site1,2. Nevertheless, this technique is relatively difficult to comprehend especially by inexperienced personnel. This is due to multiple seemingly identical measurements such as lateral proximal femur angle (LPFA), mechanical lateral distal femur angle (mLDFA), anatomical lateral distal femur angle (aLDFA), medial proximal tibial ankle (MPTA), and lateral distal tibial ankle (LDTA), with all ranging from 81° to 90°. We propose an easier screening method to identify the site of deformity of the lower limb.
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