Why does a physical therapist include quadriceps setting and straight leg raise in a home program for a patient with chondromalacia patella?

Why does a physical therapist include quadriceps setting and straight leg raise in a home program for a patient with chondromalacia patella?

• A. The vastus medialis is primarily responsible for terminal knee extension.
• B. Quads setting and SLR help improve patellar tracking.
• C. Patellofemoral compression forces are increased when the knee is extended.
• D. The vastus medialis is preferentially activated during SLR.

Answer: (B)

Focusing on patellar tracking is the main idea here. In chondromalacia patellae, the cartilage behind the kneecap often irritates when the patella tracks poorly in the trochlear groove. Strengthening and coordinating the quadriceps, especially with movements that cue the patella to sit and move more centrally, helps reduce lateral drift and improve alignment during knee flexion and extension. Quadriceps setting, an isometric contraction with the knee extended, trains neuromuscular control to pull the patella medially and stabilize it as the leg moves. This helps ensure the patella rides in the groove more consistently, lessening abnormal patellar tilt or lateral tracking that can irritate the cartilage. Straight leg raises strengthen the quadriceps without placing high patellofemoral joint compression from bending the knee deeply. This allows safe, controlled strengthening that enhances overall quadriceps power and the coordinated activation pattern needed to keep the patella aligned during movement. In short, these exercises are chosen to improve patellar tracking by promoting better neuromuscular control and balanced quadriceps activation, which helps reduce patellofemoral joint stress and symptoms. The other statements don’t fit as well: the issue isn’t that a single muscle mainly handles terminal knee extension, the problem is coordinated tracking of the patella; patellofemoral compression increases more with knee flexion than extension, so the focus isn’t on extension increasing compression; and SLR does not selectively activate the vastus medialis obliquus—the benefit comes from overall quadriceps strengthening and improved tracking, not a specific preferential activation.

Focusing on patellar tracking is the main idea here. In chondromalacia patellae, the cartilage behind the kneecap often irritates when the patella tracks poorly in the trochlear groove. Strengthening and coordinating the quadriceps, especially with movements that cue the patella to sit and move more centrally, helps reduce lateral drift and improve alignment during knee flexion and extension.

Quadriceps setting, an isometric contraction with the knee extended, trains neuromuscular control to pull the patella medially and stabilize it as the leg moves. This helps ensure the patella rides in the groove more consistently, lessening abnormal patellar tilt or lateral tracking that can irritate the cartilage.

Straight leg raises strengthen the quadriceps without placing high patellofemoral joint compression from bending the knee deeply. This allows safe, controlled strengthening that enhances overall quadriceps power and the coordinated activation pattern needed to keep the patella aligned during movement.

In short, these exercises are chosen to improve patellar tracking by promoting better neuromuscular control and balanced quadriceps activation, which helps reduce patellofemoral joint stress and symptoms.

The other statements don’t fit as well: the issue isn’t that a single muscle mainly handles terminal knee extension, the problem is coordinated tracking of the patella; patellofemoral compression increases more with knee flexion than extension, so the focus isn’t on extension increasing compression; and SLR does not selectively activate the vastus medialis obliquus—the benefit comes from overall quadriceps strengthening and improved tracking, not a specific preferential activation.