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Load-sensing variability greater in lateral compartment vs medial compartment during TKA
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Investigators discovered that the load-sensing variability between the trial implant and final implant measurements was greater in the lateral compartment compared with the medial compartment during total knee arthroplasty.
Researchers retrospectively reviewed 54 patients who underwent total knee arthroplasty (TKA) with the Vanguard Knee System (Zimmer Biomet) cemented, implant and the Verasense (OrthoSensor) Sensor-Assisted tibial insert. They performed radiographs preoperatively in all patients in the standard anterior posterior view, lateral view and merchant view. To determine the femoral component rotation, investigators used the transepicondylar axis (TEA) and measured the posterior condylar angle (PCA). At 10°, 45° and 90° of flexion with either the trial components or the final cemented implants, investigators recorded the load measurements.
Results showed in 89% of the TKAs performed, there was adequate balance seen in both the trial implants and final implants. Investigators noted the trial implant loads and final implant loads in the medial compartment were significantly associated during range of motion. At the lateral component, no significant association was seen with the trial implant loads and final implant loads. There was no correlation seen between the increase in PCA and the loads in the medial compartment at 45° of flexion and 90° of flexion, which demonstrated the femoral rotation parallel to TEA did not significantly change the compartment loads. ‒ by Monica Jaramillo
Disclosure: The researchers report no relevant financial disclosures.
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