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The vastus lateralis (/ ˈ v æ s t ə s ˌ l æ t ə ˈ r eɪ l ɪ s, ˈ r æ-/), also called the vastus externus, [1] is the largest and most powerful part of the quadriceps femoris, a muscle in the thigh. Together with other muscles of the quadriceps group, it serves to extend the knee joint, moving the lower leg forward.
The vastus lateralis is the largest and most powerful of the three vasti muscles. It arises from the several areas of the femur, including the upper part of the intertrochanteric line; the lower, anterior borders of the greater trochanter, to the outer border of the gluteal tuberosity, and the upper half of the outer border of the linea aspera.
A tendon connects muscle to bone, while a ligament connects bone to bone. [1] Injuries are common to this tendon, with tears, either partial or complete, being the most common. If the quadriceps tendon is completely torn, surgery will be required to regain function of the knee. [2] Without the quadriceps tendon, the knee cannot extend.
The patella is a floating sesamoid bone held in place by the quadriceps muscle tendon and patellar tendon ligament. Exercises should strengthen quadriceps muscles such as rectus femoris, vastus intermedius, and vastus lateralis. However, tight and strong lateral quadriceps can be an underlying cause of patellar dislocation.
The vastus lateralis has been shown to engage more during the movement when toes are pointed inward. The rectus femoris engages more when the toes are pointed outward. [ 8 ] Research has shown, that performing the leg extension with the hip flexion at a 40-degree angle rather than the typical 80-degree angle can promote more rectus femoris ...
The vastus medialis muscle is on the medial side of the femur (i.e. on the inner part thigh). [1] The vastus intermedius muscle lies between vastus lateralis and vastus medialis on the front of the femur (i.e. on the top or front of the thigh), but deep to the rectus femoris muscle. Typically, it cannot be seen without dissection of the rectus ...
From the lateral lip and its upward prolongation, the vastus lateralis muscle takes origin. The adductor magnus muscle is inserted into the linea aspera, and to its lateral prolongation above, and its medial prolongation below. Between the vastus lateralis and the adductor magnus two muscles are attached: the gluteus maximus muscle inserted above,
Physical therapy is often prescribed as a nonsurgical treatment of a tear, in which functional rehabilitation and range of motion exercises that focus primarily on the hips, gluteal muscles, and quadriceps are used to strengthen the muscles surrounding the knee. During the recovery phase, heat and ice are often applied as pain managers before ...