What symptom may indicate a rupture of the quadriceps tendon in a patient?

• A. Inability to flex the knee
• B. Pain and swelling in the ankle
• C. Palpable defect above the kneecap
• D. Continuous sharp pain in the hip

Answer: (C)

A palpable defect above the kneecap is a classic indication of a quadriceps tendon rupture. This occurs when the quadriceps tendon, which connects the quadriceps muscle to the patella (kneecap), tears. When this tendon ruptures, there is typically a gap or recess where the tendon has torn, making it possible to physically feel a depression or defect by palpation. This is often most noticeable when examining the knee in a standard seated position.

In addition to a palpable defect, other common symptoms associated with this injury include significant swelling, bruising around the knee, and an inability to extend the knee against gravity or bear weight on the affected leg, but the other symptoms might not specifically point to a rupture. The presence of such a defect is a key clinical sign that helps differentiate this injury from other possible knee injuries.