[Stresses on the patellofemoral joint]

Area of Science:

• Biomechanics
• Orthopedics

Context:

• The patello-femoral joint's stability is crucial for knee function.
• Understanding the forces acting on this joint is essential for diagnosing and treating knee conditions.

Purpose:

• To analyze the biomechanical forces acting on the patello-femoral joint during knee flexion.
• To investigate the influence of the quadriceps tendon's changing direction on joint forces.

Summary:

• Computer simulations demonstrate that the M. quadriceps femoris and Lig. patellae create opposing tension forces that balance the patello-femoral joint.
• The resultant force's action line passes through the center of rotation, resulting in zero total torque.
• During knee flexion, the quadriceps tendon contacts the femur, altering its direction and significantly impacting the resultant force and patellar tracking.

Impact:

• Provides insights into the dynamic biomechanics of the patello-femoral joint.
• Contributes to a better understanding of patellar instability and maltracking.
• Informs the development of more effective treatment strategies for knee injuries.