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The knee is the largest joint in the body, and one of the most complex and critical joints. It is a hinge joint, allowing flexion and extension, and is formed by the femur, tibia, and patella. The knee is surrounded by several muscle groups, including the quadriceps, hamstrings, and calf muscles, which work together to flex, extend, and stabilize the knee joint. These motions allow the body to perform essential movements such as walking, running, kicking, and jumping. Maintaining knee health involves stretching and strengthening the muscles that support the knee, such as the iliotibial band, hip flexors, and gluteal muscles.
| Characteristics | Values |
|---|---|
| Knee Joint | The knee is the body's largest joint and is a hinge joint. |
| Bones | The knee joint is formed by the femur (thighbone), tibia (shinbone), and patella (kneecap). |
| Muscles | Quadriceps, hamstrings, and calf muscles. |
| Ligaments | Cruciate ligaments control the knee's movement front to back. The anterior cruciate ligament (ACL) is at the front of the knee, and the posterior cruciate ligament (PCL) is at the back. Other ligaments include the medial collateral ligament (MCL) and the lateral collateral ligament (LCL). |
| Tendons | The quadriceps tendon connects the quadricep muscles to the patella. |
| Nerves | Femoral nerve, sciatic nerve, tibial nerve, and peroneal nerve. |
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What You'll Learn
Hamstrings
Hamstring muscles are skeletal muscles located at the back of the thigh. They are comprised of three muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles are used to walk, climb stairs, run, do squats, and perform various other leg movements.
The hamstrings are very susceptible to injury, especially among athletes who run, sprint, ski, skate, dance, or participate in sports that require deep squatting, such as basketball and football. Hamstring injuries can occur when suddenly stopping, slowing down, or changing direction, as these movements put a lot of strain on the muscles. Extending the leg too far when running can also overstretch the hamstrings. A common hamstring injury is a "pulled hamstring" or strain.
To prevent hamstring injuries, it is important to properly warm up and stretch before physical activity. Maintaining flexibility in the hamstrings can help to reduce the risk of injury and improve knee health. Tight hamstring muscles can cause an imbalance in the muscle forces across the knee, placing more stress on the quadriceps and increasing the likelihood of knee pain and instability.
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Quadriceps
The primary purpose of the quadriceps is to help straighten the knee. They are also responsible for other movements such as kicking, running, jumping, and walking. The rectus femoris is the only muscle in the group that spans the hip and knee joints. It originates from the hip bone and pelvis and stretches down to the kneecap. The vastus intermedius lies in the middle of the thigh, beneath the rectus femoris.
The quadriceps tendon connects the quadriceps muscles to the patella, helping to extend or straighten the knee. The patellar tendon and tibia then work together to move the entire lower leg forward. The quadriceps are also responsible for stabilising the patella, particularly due to their horizontal fibres at the distal end.
Injuries to the quadriceps are common, especially in athletes who run, jump, and kick. Quadriceps injuries can include strains, contusions, and tendonitis. Strains and contusions can prevent an individual from straightening their knee or bearing weight. Tendonitis refers to the inflammation of the tendons that connect the quadriceps to the kneecap or hip, causing thigh pain and additional pressure on the muscles.
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Calf muscles
The calf muscle is located at the back of the lower leg and consists of two main muscles: the gastrocnemius and the soleus. The gastrocnemius is the larger of the two and is just under the skin at the back of the lower leg. The soleus is located underneath the gastrocnemius. Together, they form the Achilles tendon, which attaches to the heel.
The calf muscle supports the body when standing and enables movement of the foot and lower leg. It also helps to maintain good posture. The calf muscle allows you to jump, rotate your ankle, flex your foot, and "lock" your knee.
The gastrocnemius has two heads that start on the inside and outside of the thighbone (femur). The heads of the gastrocnemius have attachments from the knee joint capsule and the oblique popliteal ligament. The muscle is a secondary knee flexor and assists in bending the knee. It also helps to stabilize the knee.
The soleus muscle also has a role in knee pain, with a trigger point near the knee that can cause pain behind the knee. However, most trigger points in the soleus refer locally in the calf and downward. These trigger points can be activated or perpetuated by overload, such as from sports or walking uphill, or from prolonged shortening, such as having the toes pointed downward for extended periods.
In addition to the gastrocnemius and soleus, a small muscle called the plantaris runs between these two larger muscles in some individuals, forming the triceps surae. The calf muscles can be stretched through exercises such as calf raises and runners' stretches, which can help alleviate heel and foot pain.
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Hip flexors
The hip flexors are a group of muscles that are responsible for flexing the hip, or bringing the leg upward toward the body. They are important for overall stability and are crucial for explosive movements like jumping and sprinting. They also help take stress off the quadriceps, which is important because excess stress on the quads means more stress on the knee.
The hip flexors include the iliacus, psoas major, rectus femoris, and sartorius. The iliopsoas is the body's most important hip flexor. 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 works to stabilise the trunk during activities such as lifting, pushing, and pulling. It also draws the knees toward the chest, for example, when swinging the leg forward while running or kicking a ball.
The iliacus and psoas major are the primary hip flexors, which work together to flex and stabilise the hip and pull the thigh and torso together when walking, running, sitting, or standing. The rectus femoris helps with hip flexion and knee extension, while the sartorius helps flex and externally rotate the hip and flex the knee.
Sitting for long periods can cause the hip flexor muscles to shorten and tighten, leading to functional problems and pain. This is a common issue for people who sit for many hours a day, such as office workers or bus drivers. Tight hip flexors can cause the pelvis to tilt and impact the rotation of the pelvis, leading to lower back pain, hip pain, and injury. To prevent this, it is recommended to get up and move more throughout the day, changing positions every 30 to 45 minutes. Stretching and strengthening exercises, such as yoga poses, can also help relieve tension and improve strength and mobility in the hip flexors.
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Iliotibial (IT) band
The iliotibial (IT) band is a long piece of connective tissue, or fascia, 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 stabilize and move the side of the knee while protecting the outer thigh.
The IT band is a thick bunch of fibres 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 IT band is one of the tendons that support the knee and can become tight with overuse, particularly in runners, cyclists, and hikers. IT band tightness can cause the kneecap to be pulled towards the outside of the knee, leading to pain and swelling around the knee.
This condition is known as iliotibial band syndrome (ITBS) and is caused by the IT band rubbing against the hip or knee bones due to excessive friction. ITBS is a common lateral knee injury that usually affects athletes who frequently run, hike, or play sports such as basketball, hockey, and soccer.
ITBS can be diagnosed by a doctor through a physical examination, considering the patient's history and symptoms. Treatment options include conservative treatments such as stretching and strengthening exercises, with surgery being a last resort for severe, chronic cases. To prevent ITBS, it is important to stretch the IT band, hip muscles, thigh muscles, and hamstrings regularly and ensure proper training techniques, warm-up, and cool-down routines.
Certain physical conditions can increase the risk of developing ITBS, including bowed legs, one leg being longer than the other, knee arthritis, ankle or foot rotation issues, and weakness in the hip, buttock, or abdominal muscles. Additionally, young individuals who exercise frequently are at a higher risk of developing ITBS.
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Frequently asked questions
The knee joint is supported by several muscle groups, including the hamstrings, quadriceps, and the muscles of the calf.
The hamstrings are a group of three muscles (biceps femoris, semitendinosus, and semimembranosus) that run across the back of the thigh. They work to bend the knee and are critical for stabilising the joint.
The quadriceps are a group of four muscles (vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris) that run along the front of the thigh. They work to straighten the knee and are the main drivers of the knee joint.
