Related Experiment Video
Updated: May 28, 2026
In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
Published on: May 5, 2023
The influence of patellar dislocation on the femoro-tibial loading during total knee arthroplasty
Nobuyuki Yoshino1, Nobuyoshi Watanabe, Yukihisa Fukuda
1Department of Orthopaedic Surgery, Kyoto Kujo Hospital, Karahashi Rajomoncho 10 Minami-ku, Kyoto 601-8453, Japan. yoshino@kta.att.ne.jp
Purpose:
Balancing the gap is essential in total knee arthroplasty (TKA). The purpose of this study was to quantify the influence of patellar position on femoro-tibial joint load in TKA. We hypothesized that resetting of the patella increased medial joint load and decreased lateral joint load.
Methods:
Our original tensor system was used during posterior-stabilized (PS) and cruciate-retaining (CR) total knee arthroplasty (TKA) using medial para-patellar approach (MPP) or sub-vastus approach (SV).
Results:
In PS-TKA, by resetting the patella, the ratios between medial and lateral compartments were not changed in both extension and flexion position using MPP and were significantly changed in flexion position using SV. In CR-TKA, by resetting the patella, the load of the lateral component decreased and the ratios between medial and lateral compartments were changed significantly in both extension and flexion position using SV.
Conclusion:
It is important to be aware that, when performing CR-KA, the load of the lateral compartment will decrease by resetting the patella using SV.
Related Concept Videos
01:16Bones of the Lower Limb: Femur and Patella
01:23Knee Joint
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...