Deviation of femoral intramedullary alignment rod influences coronal and sagittal alignment during total knee arthroplasty

The Knee
Yohei HarutaToshihiko Hara

Abstract

An intramedullary (IM) rod is used to resect the distal femur vertically to the femoral mechanical axis in the coronal plane in many cases of total knee arthroplasties (TKA). The valgus angle between the mechanical axis and the anatomical axis of the distal femur is estimated preoperatively. It is known the deviation of the IM rod in the femoral canal could influence the femoral component alignment. However, there is no published data regarding how many degrees of deviation to make with the IM rod. The purpose of this study is to measure each deviation of the IM rod using three-dimensional (3D) computer simulations. Preoperative CT scans on 30 knees undergoing TKA were studied. The line connecting central points at 10 and 20 cm proximal from the intercondylar notch was defined as the anatomical axis and the point at which the anatomical axis intersects the surface of the distal femur was considered as the entry point of the IM rod. The medio-lateral (ML) and antero-posterior (AP) deviations between the anatomical axis and the IM rod were measured. The ML and AP deviations were 0.8 and 1.1° on average. The IM rod was deviated medio-laterally more than 1.0° in three knees (10%). Surgeons should note the ML difference of the resec...Continue Reading

Citations

May 28, 2019·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Paola KoenenHolger Bäthis
Nov 16, 2021·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Naoki UmataniShuichi Matsuda
Jan 14, 2022·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Adam DriesmanWilliam J Long

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