The influence of femoral and tibial bony anatomy on valgus OA of the knee

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The influence of femoral and tibial bony anatomy on valgus OA of the knee Bernhard Springer1,2   · Ulrich Bechler1   · Wenzel Waldstein2   · Kilian Rueckl1   · Cosima S. Boettner1 · Friedrich Boettner1  Received: 29 June 2019 / Accepted: 25 September 2019 © European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA) 2019

Abstract Purpose  Approximately 10% of all patients that require a total knee arthroplasty present with valgus osteoarthritis (OA) of the knee. Valgus OA goes along with posterolateral bone loss and lateral soft tissue tightness. The role of malalignment on the development of OA is not fully understood. The current study investigates whether the femoral offset (FO), femoral mechanical–anatomical (FMA) angle, anatomical lateral distal femur angle (aLDFA), mechanical lateral distal femur angle (mLDFA), medial proximal femur angle (MPFA), medial proximal tibia angle (MPTA) or lateral distal tibia angle (LDTA) differ in patients with valgus OA of the knee. Methods  FO, FMA angle, aLDFA, mLDFA, MPFA, MPTA and LDTA were assessed and compared between 100 consecu‑ tive knees with minimal valgus OA (50 male, 50 female) and 100 consecutive knees with minimal varus OA (50 male, 50 female). Results  FO was significantly higher in males with valgus OA (p = 0.002) and females with varus OA (p = 0.01). The observed values for the FMA angle were significantly higher in males with valgus OA (p = 0.002) and females with varus OA (p = 0.041). The aLDFA and mLDFA were significantly smaller in all patients with valgus OA (p