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Mechanics of the knee and problems in reconstructive surgery
The Journal of Bone and Joint Surgery. British Volume
|August 1, 1978
Summary
This study analyzes knee joint forces using radiographs, revealing that thigh angle, not flexion, dictates force transmission. Understanding these forces is crucial for knee biomechanics and surgical outcomes.
Area of Science:
- Biomechanics
- Orthopedic Surgery
- Radiology
Background:
- Accurate assessment of static force transmission at the knee is essential for understanding joint function and pathology.
- Previous analyses have often overlooked critical geometric factors influencing knee joint loading.
Purpose of the Study:
- To analyze static force transmission at the knee using radiographic measurements.
- To identify key parameters influencing knee joint forces and highlight common errors in analysis.
Main Methods:
- Utilized radiographic measurements to determine the line of body weight and bone orientation during functional knee positions.
- Calculated various forces acting across the knee joint based on geometric parameters.
Main Results:
- The angle of the thigh relative to the vertical is more critical than the degree of knee flexion for force transmission.
- Tension in the extensor mechanism varies above and below the patella.
- Small geometric errors in anteroposterior radiographs can lead to significant alterations in joint load.
Conclusions:
- Recognizing the importance of thigh-to-vertical angle and differential extensor mechanism tension is vital to avoid fundamental errors in knee force analysis.
- Findings have implications for understanding patellar mechanics, patellectomy effects, and optimizing total knee replacement outcomes.