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The knee is the largest joint in the body and is formed by the femur (thighbone), the tibia (shinbone), and the patella (kneecap). The knee is surrounded by several muscle groups, each of which helps maintain stability and move the knee joint through motion in conjunction with ankle and hip joint movements. The muscles of the knee include the quadriceps, hamstrings, and the muscles of the calf. These muscles work in groups to flex, extend and stabilize the knee joint.
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What You'll Learn
Hamstrings
The knee is the biggest joint in the body and is formed by the femur (thighbone), the tibia (shinbone), and the patella (kneecap). The knee joint is a hinge joint, allowing flexion and extension, as well as other limited movements. The knee is surrounded by several muscle groups, which help to maintain stability and move the knee joint.
The hamstrings work together to flex the leg at the knee. Tight hamstring muscles can cause an imbalance in the forces across the knee, placing more stress on the quadriceps muscles. This can be alleviated by stretching. A runner's stretch, for example, stretches the hamstring, as well as the calf muscles, which can help with heel and foot pain.
The knee flexors in the posterior thigh compartment, which include the hamstrings, are supplied by the sciatic nerve (L4 to S3), which branches into the tibial and common peroneal nerves. The hamstrings are innervated by the tibial nerve, which also innervates the gastrocnemius muscle, a knee flexor in the posterior leg compartment.
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Quadriceps
The knee is the body's largest joint, and it is also one of the most commonly injured. The knee joint is formed by the femur (thighbone), the tibia (shinbone), and the patella (kneecap). The knee contains bones, cartilage, muscles, ligaments, and nerves. Muscular support is the joint's most important stabilising factor, and proper conditioning and training can help prevent sports injuries.
The quadriceps are one of the largest muscle groups in the body and are the main drivers of the knee joint. The quadriceps are made up of four muscles on the front of the thigh that run from the hip to the knee: the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. These muscles originate in the ilium and femur and insert into the tibia.
The quadriceps muscles contract to initiate movement in the patella, the patellar tendon, and tibia, allowing the entire lower leg to move forward. The quadriceps tendon connects the quadriceps muscles to the patella and helps to extend or straighten the knee. The quadriceps tendon is the distal attachment point of the quadriceps femoris tendon.
The quadriceps muscles can become tight, preventing the full movement of the tendons supporting the knee and applying greater pressure on the kneecap. Stretching the quadriceps is important for maintaining knee health and preventing pain.
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Calf muscles
The calf muscle is located in the posterior, or back part, of the lower leg. It is made up of two main muscles: the gastrocnemius and the soleus. The gastrocnemius is the larger of the two and is located just under the skin at the back of the lower leg. The soleus is wide and flat and sits slightly deeper than the gastrocnemius. It starts just below the knee and runs down the lower leg, connecting to the Achilles tendon above the heel. Together, these muscles support the body when standing and enable movement of the foot and lower leg. They also propel the body forward when walking or running, and allow for jumping and ankle rotation.
The calf muscle is essential for knee stability and movement. It helps to lock the knee and supports the knee joint during high-impact activities such as running and jumping. The gastrocnemius and soleus work together to enable these movements, and they are sometimes referred to as one large muscle with two sections due to their connection at the Achilles tendon.
Calf muscle strength is important for maintaining knee health and preventing injuries. Weakness or reduced strength in the calf muscle has been associated with knee osteoarthritis (OA). Strengthening exercises for the calf muscle may help improve knee OA symptoms and function, although further studies are needed to confirm this.
Calf strains, or pulled calf muscles, are a common injury, especially among athletes. They occur when the muscles behind the shin bone are overstretched, resulting in pain, swelling, and difficulty bending or flexing the foot, ankle, or knee. Treatment for a pulled calf muscle typically includes rest, ice, compression, and elevation (RICE). It is important to seek treatment promptly to ensure a speedy recovery and prevent further damage.
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Iliotibial (IT) band
The iliotibial (IT) band is a tendon, or a long piece of connective tissue, that runs along the outside of the leg from the hip to the knee and shinbone. It is also known as the iliotibial tract or Maissiat's band. The IT band helps to extend, abduct, and rotate the hip, as well as stabilise and move the side of the knee, protecting the outer thigh.
The IT band is a thick band of fibrous tissue that provides stability to the knee and hip. It helps prevent dislocation of the knee as it runs down to the top of the tibia (shinbone). The knee is the body's largest joint and is surrounded by several muscle groups, each of which helps to maintain stability and move the knee joint. The IT band is one of these muscle groups.
Iliotibial band syndrome (ITBS) is a common lateral knee injury caused by overuse and repetitive flexion and extension of the knees. ITBS occurs when the IT band becomes tight, irritated, or inflamed, causing friction on the outside of the knee when bending, resulting in pain. ITBS is caused by excessive friction from the IT band being overly tight and rubbing against the bone. ITBS is more common in athletes who frequently exercise, such as basketball, hockey, and soccer players, as well as long-distance runners.
ITBS can cause pain on the outer part of the knee, just above the joint, as well as aching, burning, or tenderness. There may also be a clicking sensation in the knee. ITBS usually gets better with time and treatment, and surgery is rarely needed. Treatment may include stretching the IT band, hip muscles, thigh muscles, and hamstrings, as well as using a foam roller to loosen the IT band.
Stretching the muscles that support the knee is important for improving and maintaining knee health. Tight muscles, such as the quadriceps and hamstrings, can cause an imbalance in muscle forces across the knee, leading to increased pressure and stress on the kneecap and surrounding tendons. Therefore, stretching these muscles can help prevent knee injuries and improve knee stability.
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Hip flexors
The hip flexors are a group of muscles responsible for flexing the hip, or bringing the leg upward toward the body. The primary hip flexors are the psoas major and the iliacus, which, collectively, are often called the iliopsoas. The psoas originates from the lower six vertebrae of the spine, while the iliacus originates from the inside bowl of the pelvis. They meet and insert at the top of the femur, or upper leg bone. The iliopsoas is the body's most important hip flexor.
Sitting for long periods can cause the hip flexor muscles to shorten and tighten, tilting the pelvis and changing the way a person walks. This is a common problem for people who sit for many hours a day, such as those with desk jobs or bus drivers. Weak hip flexors can also cause the pelvis to tilt. Certain athletes are also prone to tight hip flexors, particularly runners and cyclists, who repeatedly use the hip flexors to lift their legs.
Tight hip flexors can cause pain and discomfort in the front of the hip, which typically worsens with prolonged sitting or repetitive hip-flexion movements like running and cycling. Signs of tight hip flexors include pain or discomfort in the front of the hip. Hip flexor strengthening exercises may worsen hip tension. Working with a physical therapist or certified personal trainer is a good idea.
The rectus femoris is one of the quadriceps and a hip flexor muscle. It has two functions: to flex at the hip and to extend the knee. It is engaged intensely when both functions are at play, such as when kicking a soccer ball or swinging a straight leg forward. The sartorius, the longest muscle in the body, crosses the hip and knee joints. It originates at the anterior superior iliac spine and inserts on the pes anserinus. It functions to flex the hip and externally rotate the leg.
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Frequently asked questions
The muscles that support the knee include the quadriceps, hamstrings, and the muscles of the calf.
The quadriceps are one of the largest muscle groups in the body and are the main drivers of the knee joint. They help to extend or straighten the knee.
The hamstrings are a group of three muscles that run across the back of the thigh from the hip to below the knee. They work to bend the knee.
The calf muscles include the gastrocnemius, which acts as a flexor of the knee and plantar flexor of the foot.
The knee is surrounded by several muscle groups that help to maintain stability. The iliotibial (IT) band, a band of thick fibrous tissue running from the hip to the tibia, helps to provide stability to the knee and prevent dislocation.
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