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Optimal definitions for computing HKA angle in caos: an in-vitro comparison study
Guillaume Dardenne1,2, Bhushan Borotikar1,2, Hoel Letissier1,2,3
1CHU Brest, Brest, France.
Insights
This study compared methods for estimating the Knee Center (KC) and Frontal Plane (FP) in Computer Assisted Orthopedic Surgery (CAOS) to determine the Hip-Knee-Ankle Angle (HKAA). The helical approach for FP and either the notch or tibial spines for KC offered the best accuracy and precision for HKAA measurement.
Area of Science:
- Orthopedic Surgery
- Biomechanical Engineering
- Medical Imaging
Background:
- Accurate determination of the Hip-Knee-Ankle Angle (HKAA) is crucial in Computer Assisted Orthopedic Surgery (CAOS).
- Existing methods for estimating the Knee Center (KC) and Frontal Plane (FP) vary in precision and accuracy.
- Standardization of these estimations is needed for reliable HKAA measurements.
Purpose of the Study:
- To compare the precision and accuracy of nine KC and seven FP estimation methods in CAOS.
- To identify the optimal combination of KC and FP methods for precise HKAA determination.
- To evaluate the performance of different CAOS software algorithms for HKAA calculation.
Main Methods:
- An in-vitro experiment using thirteen cadaveric lower limbs.
- Development of a CAOS software application to compute HKAA.
- Measurement of HKAA precision and accuracy using nine KC and seven FP methods, including the helical approach.
Main Results:
- The helical method for FP determination yielded the highest HKAA precision.
- The highest HKAA accuracy was achieved using the helical approach for FP and either the notch or tibial spines for KC.
- Specific combinations of FP and KC methods were identified for optimal HKAA estimation.
Conclusions:
- The helical approach for FP determination combined with the notch or tibial spines for KC estimation provides sufficient accuracy and precision for HKAA.
- This study highlights the importance of method selection for reliable HKAA measurements in CAOS.
- The findings can guide the development and application of CAOS software for improved orthopedic procedures.
Abstract:
The goal of this study was to assess and compare the precision and accuracy of nine and seven methods usually used in Computer Assisted Orthopedic Surgery (CAOS) to estimate respectively the Knee Center (KC) and the Frontal Plane (FP) for the determination of the HKA angle (HKAA). An in-vitro experiment has been realized on thirteen cadaveric lower limbs. A CAOS software application was developed and allowed the computation of the HKAA according to these nine KC and seven FP methods. The precision and the accuracy of the HKAA measurements were measured. The HKAA precision was highest when the FP is determined using the helical method. The HKAA accuracy was highest using the helical approach to determine the FP and either the notch or the tibial spines to determine the KC. This study shows that the helical approach to determine the FP and either the notch or the middle of tibia spines are the combinations that provide both a good enough accuracy and precision to estimate the HKA.
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