Final answer:
Pain near the patellar tendon with an intact knee extensor mechanism suggests Runner's Knee or patellofemoral syndrome, which can arise from overuse and is common among runners. Treatment includes rest and a gradual return to activity, with an emphasis on strengthening the quadriceps femoris muscle to prevent future issues.
Step-by-step explanation:
Pain along the patellar tendon near its attachment to the patella with an intact extensor mechanism of the knee suggests the possibility of Runner's Knee, which is also known as patellofemoral syndrome. This condition is often a result of overuse, particularly in activities that involve a lot of running or knee bending. Symptoms typically include dull, aching pain around the front of the knee and deep to the patella.
Additionally, if the pull produced by the medial and lateral sides of the quadriceps femoris muscle is not balanced, this can lead to abnormal tracking of the patella, potentially causing pain and damage to the articulating surfaces of the knee. Treatment usually involves resting from the activities causing the pain followed by a gradual return to activity. Strengthening the quadriceps femoris muscle is important to correct imbalances and help prevent reoccurrence.
The patella serves as a protective element and aids the quadriceps femoris in extending the leg at the knee. Maintaining strong and balanced quadriceps muscles is vital for the homeostatic function of the knee, which includes stability and movement without pain.