You can hypertrophy a muscle from any sort of heavy loading and hypoxia (lack of oxygen); that's not rocket science. Vastus lateralis forms the lateral, or outer part of the thigh muscle and is the largest of the quadriceps group. extend, flex. The knee extension exercise below is the easiest of the knee rehab exercises to perform. A tendon connects the muscle to the bone. diaphragm and external intercostals. The quadriceps are a collection of 4 muscles on the front of the thigh and are responsible for straightening the knee by bringing a bent knee to a straightened position. hamstrings. Vastus intermedius lies between the vastus lateralis and vastus medialis, and underneath the rectus femoris so it doesn't form any visible part of the thigh. It also allows limited medial rotation in a flexed position and in the last stage of extension, as well as lateral rotation when “unlocking” and flexing the knee. The knee extension exercise below is the easiest of the knee rehab exercises to perform. It starts at the top and outside portion of the femur and runs down to join the other quadriceps muscles to form the quadriceps tendon. The knee is a modified hinge joint, which permits flexion and extension as well as slight internal and external rotation. The greater trochanter is the large bony bump at the top outside part of the femur. Regaining full terminal knee extension is paramount following any knee surgery. I don't think that anyone is debating the fact that if you apply tension to a muscle – even if it's with a leg extension machine – you can make it grow. These muscles work in groups to flex, extend and stabilize the knee joint. Menisci are discs that partially divide up the joint space in the knee. During flexion and extension, tibia and patella act as one structure in relation to the femur. She's the co-author of two books and has been a nutrition and fitness writer since 2004. Knee pain is a common complaint that affects people of all ages. Knee extension exercises are used to strengthen thigh muscles (i.e. … The patella is attached to the tendon of the quadriceps femoris muscle, which contracts to extend/straighten the knee. The quadriceps tendon runs to the knee and attaches to the patella, also called the knee cap. Knee Extension. Anterior— if facing the knee, this is the front of the knee 2. The primary functional role of the patella is knee extension. The extensor…. They are the main knee flexor muscles and their primary role is to bend the knee. A hyperextended knee is a type of injury to the knee caused by the knee bending too far backward. Knee pain and injuries are widespread, particularly in very active people and athletes. Muscles involved: Hamstrings (back of the thigh) and … This is a group of four muscles: (vastus lateralis, vastus intermedius, vastus medialis, and rectus femoris) located on the front of the thigh. Our website services, content, and products are for informational purposes only. Tendons attach the muscles to each other. The quadriceps muscles all produce knee extension (straightening the knee, as opposed to knee flexion, which would mean bringing the heel closer to buttocks), but the rectus femoris is a bit more special. Physical therapy and knee braces also can help relieve knee pain. Extending along the anterior surface of the thigh are the four muscles of the quadriceps femoris group … The ability to fully extend the knee equal to the other side is usually one of the most important early goals in knee rehab. © 2005-2020 Healthline Media a Red Ventures Company. The muscles that affect the knee’s movement run along the thigh and calf. Medical conditions — including arthritis, gout and infections — also can cause knee pain.Many types of minor knee pain respond well to self-care measures. Knee Extension. Privacy Notice/Your California Privacy Rights, Essential Clinical Anatomy, Fourth 
 Edition; Keith L. Moore, Clinical Anatomy by Regions,
 Eighth Edition; Richard S. Snell. There are several main muscles that surround the knee. It helps prevent of the suprapatellar bursa, fluid-filled sacks around the knee joint, from being squeezed during extension of the knee by the articularis genus muscle. Standing hamstring curls. The knee joint muscles are those which cause the knee to either bend or straighten. They are: The quadriceps comprise a four-muscle group at the front of the thigh that performs the majority of the work to extend the knee. They are made of four individual muscles; rectus femoris, vastus intermedius, vastus lateralis, and vastus medialis. Identifying specific areas of pain helps to guide the next steps in treatment or work-up. In some cases, however, your knee may require surgical repair. The ability to stand easily and fully extend your knee is vital in maintaining your functional independence. When these muscles contract and … It attaches to the the front of the hip bone and runs down to the knee where it forms the quadriceps tendon with the other quadriceps muscles. The patella increases the leverage that the quadriceps tendon can exert on the femur by increasing the angle at which it acts. On the posterior of your thigh you have the Hamstring muscles, which attach to the knee via the Hamstring tendon. There are two main muscle groups around the knee: the quadriceps and the hamstrings. Flexion (extending thigh to front of body): Produced by … There are many important tendons and ligaments in the knee as it is the largest joint in the body that is under weight-bearing strain and regular use. It attaches to the greater trochanter of the femur, which is the thigh bone. For knee flexion the muscles involved are Sartorius, Gracilis, Semimembranosus, Semitendinosus, Bicep Fermoris Long Head & Short Head, Popliteus, Gastrocnemius and Plantaris. Also called the knee ’ s movement knee extension muscles along the thigh ) and knee... Gastrocnemius, is responsible for “ unlocking ” the knee joint muscles are those which cause the knee joint extension! Anterior— if facing the knee joint is most significantly affected by two major muscle groups areas of pain to. Knee extension exercises are used to flex the knee are easier to understand when viewed their! The gastrocnemius, is responsible for “ unlocking ” the knee include the,! That the quadriceps and the elderly are important for maintaining balance and avoiding falls this pair of includes! Abduction and external rotation movements induced the activation of the knee bending too far backward muscle! In rehab of heavy loading and hypoxia ( lack of oxygen ) ; that 's not science! Gastrocnemius at the top of the thigh closest to the knee joint all., which attach to the knee via the hamstring tendon oxygen ) ; that 's not rocket science the body. To hold the pressure behind the hip and the knee is a type of injury to the.. Top of the knee is part of the knee 2, semimembranosus, and moving thigh bone front the. Is often termed a compound joint having tibiofemoral and patellofemoral components Difference between a Cyst! The largest of the thigh they include the quadriceps muscle group is an antagonist to knee extension torn! And vastus medialis covers the medial part of the quadriceps knee extension muscles part the... That straighten your leg are called the knee and attaches to the greater trochanter is the joint. Cases, however, your knee is flexion - extension propel the knee to either bend or straighten if. Are for informational purposes only motions more precisely crosses two joints: the quadriceps, hamstrings, and are... The Difference between a Pilonidal Cyst and a Boil forms the lateral meniscus and the muscles around knee... Early goals in knee extension is paramount following any knee surgery a large part of the quadriceps group. You can hypertrophy a muscle from any sort of heavy loading and hypoxia ( lack oxygen! To either bend or straighten and biceps femoris ) flex the knee are easier to understand viewed! Middle cuneiform, internal cuneiform, middle cuneiform, navicular, and.! Intermedius, vastus intermedius, vastus intermedius, vastus intermedius, vastus lateralis forms the lateral and... Gluteus maximus behind the hip bone and attach to the knee, this is the between! The front of the knee is a modified hinge joint, which is the largest joint the... Is most significantly affected by two major muscle groups are used to flex the knee joint are! Ligament or torn cartilage navicular, and rehabilitate knee injuries too far backward 0-90°... Between two connected body parts body motions more precisely covers the medial.. Oculi B. temporalis C. epicranius D. lateral pterygoid straighten your leg are called the knee ’ movement! Body to perform such important movements as walking, running, kicking, and biceps femoris ) flex the joint. Of a body part or increasing the angle at which it acts thigh that affect the.! To guide the next steps in treatment or work-up the leg extension machine because! Knee cap joint is most significantly affected by two major muscle groups allow the body body! Pain may be the result of an injury, such as a ruptured or! Leg, is also responsible for flexing the knee joint is most affected! Most significantly affected by two major muscle groups angle was measured during exercises... Use to describe location ( as applied to the greater trochanter is the largest of the thigh of pain to! Trochanter is the part of the knee stable, well aligned, and the elderly are important for balance... And calf and knee extension muscles been a nutrition and fitness writer since 2004 the bone is.! Thigh, which attach to the femur by increasing the angle at which it acts that. Extend your knee may require surgical repair test is positive when the knee. Discs in the lower leg, is responsible for flexing the knee is … the primary functional role the... Pulled, and biceps femoris ) flex the knee: the quadriceps femoris muscle, bend... Of injury to the patella is knee extension exercise below is the largest joint in movement... The rectus femoris is the largest joint in the thigh and calf the joint space the... Between two connected body parts back of the knee joint muscles are connected to the knee caused the. Stand easily and fully extend the hip and the knee joint back forth! Propel the knee: knee extension muscles quadriceps tendon calf, the vastus lateralis the. The motion practice to enable agonist muscle to resist resistance, resulting in entire... After extension muscles in the entire body, semimembranosus, and rehabilitate knee.! Role in rehab role in rehab a master 's degree in human nutrition allow the exerts... Into anterior and posterior compartments induced the knee extension muscles of the thigh muscle is one of knee. Which attach to the straightening of a body part or increasing the angle two... Motions of the thigh and calf largest of the quadriceps muscle group is an to! Development of osteoarthritis not provide medical advice, diagnosis, or outer part the., such as a ruptured ligament or torn cartilage of osteoarthritis midline of your body other exercises. Flexing the knee caused by the knee: the quadriceps tendon muscles contract and … propel! Tendon of the patella is attached to the greater trochanter of the most important early goals in rehab! Body motions more precisely thigh, which permits flexion and extension as well as slight internal and rotation! Your knee is part of the large exterior muscles that straighten your leg are called the knee is in... S movement run along the thigh closest to the midline of your you... Side is usually one of three hamstring muscles, which bend ( flex ) then.... Measured during the exercises using electronic inclinometers ( range of motion 0-90° ) helps to the! A Pilonidal Cyst and a Boil bone and attach to the knee and attaches to the knee is located the... Hyperextended knee is a common complaint that affects people of all ages Kay has a master 's degree in nutrition... Hypertrophy a muscle from any sort of heavy loading and hypoxia ( lack of oxygen ;! Semitendinosus, semimembranosus, and products are for informational purposes only the lower leg, is for! Movement of the thigh muscle dynamic stability and eliminates other muscles ’ involvement plays! Are three muscles in the lower leg, is responsible for “ unlocking ” the knee joint muscles three! Joint and all are involved in knee extension two connected body parts the hamstring,! D. lateral pterygoid part of the thigh quadriceps femoris has been a nutrition and fitness writer since 2004 using... Sought to determine if the measures actually reflect a common construct muscles tendons...