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Determining the isometric point of the knee
James P Stannard1, Allan Hammond, Danny Tunmire
1Department of Orthopaedic Surgery, University of Missouri Hospital, Columbia, Missouri, USA. stannardj@health.missouri.edu
The Journal of Knee Surgery
|May 26, 2012
Summary
Radiographic reference points accurately reproduce knee isometric points for posterolateral corner (PLC) reconstruction, showing less displacement than anatomical landmarks. This finding aids in precise surgical management of knee dislocations.
Area of Science:
- Orthopedic surgery
- Knee biomechanics
- Anatomical reconstruction
Background:
- Knee dislocations often necessitate posteromedial and posterolateral reconstructions.
- Accurate identification of isometric points is crucial for successful ligamentous reconstruction.
Purpose of the Study:
- To compare the accuracy of radiographic reference points versus anatomical landmarks in replicating knee isometric points.
- To evaluate the reproducibility of isometric points for posteromedial and posterolateral corner (PLC) reconstructions.
Main Methods:
- Twenty cadaveric knees underwent posteromedial and posterolateral surgical approaches.
- Isometric points were identified using both anatomical landmarks and radiographic reference points.
- Knee flexion was assessed using an Isometer to measure displacement (mm).
Main Results:
- The radiographic method for the PLC showed significantly less displacement (1.63 mm) compared to the anatomical method (4.84 mm) (p < 0.00018).
- For the posteromedial side, radiographic methods yielded less displacement (2.10 mm) than anatomical methods (3.21 mm), though not statistically significant (p = 0.074).
Conclusions:
- Radiographic reference points offer a more accurate method for identifying isometric points in knee reconstructions, particularly for the PLC.
- This improved accuracy can enhance surgical outcomes in managing knee dislocations requiring posteromedial and posterolateral reconstructions.
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