Which statement about the vastus medialis and straight leg raise is NOT true?

Which statement about the vastus medialis and straight leg raise is NOT true?

• A. The vastus medialis is preferentially recruited during SLR.
• B. The vastus medialis is active during quadriceps setting.
• C. The vastus medialis helps promote patellar tracking.
• D. The vastus medialis is not the only muscle responsible for terminal knee extension.

Answer: (A)

The key idea is that the vastus medialis does not act in isolation during straight leg raise; it is not preferentially recruited in that movement. The quadriceps function as a group during a straight leg raise, and activation patterns are not biased toward the vastus medialis in this task. In contrast, the vastus medialis plays a crucial role in guiding patellar tracking, particularly during the final degrees of knee extension, where it helps medialize the patella and contribute to stable tracking. It is active during quadriceps setting, which is an isometric contraction used to stabilize the knee and reinforce coordinated patellar motion. And while the vastus medialis contributes to terminal knee extension, it is not the sole muscle responsible—other quadriceps components also participate to produce full, stable extension.

The key idea is that the vastus medialis does not act in isolation during straight leg raise; it is not preferentially recruited in that movement. The quadriceps function as a group during a straight leg raise, and activation patterns are not biased toward the vastus medialis in this task. In contrast, the vastus medialis plays a crucial role in guiding patellar tracking, particularly during the final degrees of knee extension, where it helps medialize the patella and contribute to stable tracking. It is active during quadriceps setting, which is an isometric contraction used to stabilize the knee and reinforce coordinated patellar motion. And while the vastus medialis contributes to terminal knee extension, it is not the sole muscle responsible—other quadriceps components also participate to produce full, stable extension.