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The quadriceps active test is performed with the knee flexed between 80°-90° and in neutral rotation. From this initial position, the patient is then asked to fire the quadriceps muscle while the examiner applies counter pressure against the ankle.
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Tendons are strong cords of fibrous tissue that attach muscles to bones. The quadriceps tendon works with the muscles in the front of your thigh to straighten your leg. Small tears of the tendon can make it difficult to walk and participate in other daily activities. A large tear of the quadriceps tendon is a disabling injury.
The quadriceps femoris consists of four muscles: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius (Fig. 14-9). The primary action of these muscles is to extend the leg at the knee. They all unite to form the quadriceps tendon, which inserts into the patella.
Quadriceps active test.OrthopaedicsOne Articles.In: OrthopaedicsOne – The Orthopaedic Knowledge Network.Created Feb 01, 2008 20:27. Last modified Feb 14, 2012 11:55 ver. 9.Retrieved
The lateral patellar apprehension test is usually performed at 45° of knee flexion. In this test, any increase in lateral translation that causes pain to the patient and a reactive contraction of the quadriceps muscle, when compared with the contralateral side, is indicative of a previous patellar dislocation.
Tendon rupture occurs when there is a violent contraction of the quadriceps muscle when the knee is flexed (bent), causing the quadriceps or patellar tendon to completely tear or rupture. Quadriceps tendon rupture occurs more commonly in patients who are older than 40 years of age.
Test Position: Supine. Performing the Test: Have the patient’s involved limb in a position of 45 degrees hip flexion and 90 degrees of knee flexion. Look for the tibia to “sag” compared to the position of the femur. The examiner should then sit on the foot of the affected limb to stabilize. Next, have the patient actively contract their quad muscle. A positive test occurs if the patient’s …