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Hamstrings loading contributes to lateral patellofemoral malalignment and elevated cartilage pressures: an in vitro
John J Elias1, Marcus S Kirkpatrick, Archana Saranathan
1Department of Orthopaedic Surgery, Akron General Medical Center, OH, USA. john.elias@akrongeneral.org
Clinical Biomechanics (Bristol, Avon)
|May 6, 2011
Summary
Hamstring loading alters patellar movement, increasing lateral tilt and shift. This can lead to increased pressure on lateral patellofemoral cartilage, potentially causing cartilage damage.
Area of Science:
- Biomechanics
- Orthopedics
- Sports Medicine
Background:
- Hamstring forces can influence tibiofemoral joint mechanics.
- Previous research suggests a link between hamstring loading and patellofemoral issues.
Purpose of the Study:
- To investigate the effect of hamstring forces on patellofemoral kinematics.
- To quantify the impact of hamstring loading on patellofemoral cartilage pressure.
Main Methods:
- In vitro analysis of ten human knees at varying flexion angles (40°, 60°, 80°).
- Application of quadriceps and hamstring loads with and without simulated hamstring forces.
- Measurement of patellofemoral kinematics and cartilage contact pressures using magnetic and pressure sensors.
Main Results:
- Hamstring loading significantly increased patellar flexion, lateral tilt, and lateral shift.
- Increased contact force on lateral patellar cartilage by approximately 5%.
- Elevated maximum lateral patellofemoral pressure by approximately 0.3 MPa.
Conclusions:
- Hamstring-induced lateral patellar shift and tilt can cause malalignment.
- This malalignment may direct pressure towards the lateral facet, potentially overloading lateral cartilage.
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