Dominic Stone
The knee is the body's largest joint, and it is also one of the most commonly injured. It is a critical joint that supports us in our daily activities, from walking to running and jumping. The knee is a complex joint, formed by the femur (thighbone), tibia (shinbone), and patella (kneecap). The knee is surrounded and supported by several muscle groups, including the quadriceps, hamstrings, hip flexors, and the iliotibial (IT) band. These muscles help maintain stability and control the knee's movement, working in conjunction with the knee's ligaments and tendons. Stretching and strengthening these muscles are important for improving and maintaining knee health and preventing injuries.
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What You'll Learn
Hamstrings
The hamstrings are skeletal muscles located at the back of the thigh. They start at the pelvis and extend to the knee. The hamstring tendons attach them to bones in the pelvis, knee, and lower leg.
The hamstring muscle group includes three specific muscles: the biceps femoris, semitendinosus, and semimembranosus. The biceps femoris is on the outside of the back of the thigh. It functions to flex the knee, extend the thigh at the hip, and rotate the lower leg from side to side when the knee is bent. The semimembranosus is on the innermost side of the back of the thigh. It flexes the knee joint, extends the thigh at the hip, and rotates the hip and lower leg. The semitendinosus is between the semimembranosus and biceps femoris, and it has the same function as the semimembranosus.
The hamstrings are used for walking, climbing stairs, running, doing squats, and many other leg movements. They are often classified as a knee flexor, but they are most active as the knee reaches full extension. When the knee is fully extended, the hamstrings work eccentrically to decelerate knee extension, create stability, and function as a knee extensor.
Hamstring injuries are the most common sports injury. They often occur in athletes who run at fast speeds, such as sprinters, and people who play soccer, basketball, and football. They can also occur in skiers, skaters, dancers, and other athletes who often have their knees bent in deep squat positions. Hamstring strains can range from mild to severe, from overstretched muscle fibres to a complete tear. Stretching, warming up, and not pushing through pain in the hip, knee, and leg are the best ways to avoid hamstring injuries.
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Quadriceps
The quadriceps femoris muscle, also called the quadriceps extensor or simply quadriceps or quads, is a large muscle group that includes four prevailing muscles on the front of the thigh: the rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis. The name "quadriceps" comes from the Latin "four-headed muscle of the femur". The rectus femoris is the only quad muscle that spans the hip and knee joints, allowing it to flex the thigh at the hip joint and extend at the knee joint. The other parts of the quadriceps arise from the surface of the femur and ultimately insert into the tuberosity of the tibia via the patella, where the quadriceps tendon becomes the patellar tendon.
The quadriceps are the main drivers of the knee joint and are the sole extensor muscle of the knee, allowing for knee extension and straightening. They are active in kicking, jumping, cycling, and running, and are vital for walking. However, the quadriceps are prone to injuries such as strains, contusions, and tendonitis, which can prevent knee straightening and weight-bearing.
The rectus femoris can activate its fibres in the longitudinal mode, allowing it to contract the most distal fibres in the absence of the most proximal ones, likely delaying the onset of fatigue. The vastus medialis acts as a patellar stabilizer, pulling on the median axis of the femur during contraction.
Strength testing of the quadriceps involves evaluating the patient in sitting and prone-lying positions to assess quadriceps motion, flexibility, and strength. This includes resisted knee extension with the hip flexed and extended to test the resistance of knee extension and hip flexion.
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Hip flexors
The iliopsoas is the body's most important hip flexor. It includes the iliacus and psoas major, which are the primary hip flexors. They work together to flex and stabilize the hip and pull the thigh and torso together when walking, running, sitting, or standing. 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 also draws the knees toward the chest, for example, when swinging the leg forward while running or kicking a ball in soccer.
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 is the longest muscle in the body, crossing the hip and knee joints. It helps to flex the hip and externally rotate the leg. The pectineus acts as a hip flexor and secondary adductor, originating on the superior pubic ramus and inserting on the pectineal line of the femur.
Sitting for long periods can shorten and tighten the hip flexor muscles, causing the pelvis to tilt. This is a common problem for people who sit for many hours a day, such as office workers or bus drivers. Certain athletes are also prone to tight hip flexors, especially runners and cyclists, who repeatedly use the hip flexors to lift their legs. Weakness in the core, glutes, or piriformis muscles can also force the hip flexors to take over some of the job of stabilizing the spine and pelvis, leading to stiffness. To keep the hip flexors supple, it is recommended to get up and move regularly throughout the day.
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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 connects to the Achilles tendon above the heel. Together, these muscles support you when you stand, walk, run, and jump. They also enable you to move your foot and lower leg, rotate your ankle, flex your foot, and "lock" your knee.
The calf muscle is essential for maintaining good posture and stability. It also propels, or pushes, you forward when you walk or run. A strong calf muscle can help prevent injuries and improve stability. For example, studies have shown that strengthening the calf muscle can be beneficial for patients with knee osteoarthritis, as it can improve pain and function. Additionally, stretching the calf muscle can be beneficial for overall knee health and help alleviate heel and foot pain.
However, the calf muscle is susceptible to injuries, especially in athletes who participate in sports that require quick movements. Calf strains, or pulled calf muscles, are caused by overstretching the muscles behind the shin bone. Symptoms of a pulled calf muscle include pain, swelling, and trouble bending and flexing the foot, ankle, or knee. Treatment for a mild sprain typically includes rest, ice, compression, and elevation (RICE). For more severe injuries, it is important to seek guidance from a healthcare provider.
In summary, the calf muscle plays a crucial role in supporting the knee and enabling various lower body movements. Strengthening and stretching the calf muscle can help improve knee health and prevent injuries. However, it is important to be cautious of calf strains, as they are common injuries that can occur during physical activity.
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IT band
The iliotibial (IT) band is a band of thick fibrous tissue that runs from the hip down to the lateral aspect of the tibia (shinbone). This band of tissue helps to provide stability to both the knee and the hip, and by running down to the top of the tibia, it helps to prevent knee dislocation. The IT band is one of the most important stabilisers of the knee, especially during movement.
The IT band is a crucial structure for athletes, particularly runners, who are at risk of developing iliotibial band syndrome (ITBS). ITBS is a condition where the IT band becomes irritated or swollen from rubbing against the hip or knee bones. This can be caused by a number of factors, including overuse, excessive foot pronation, hip abductor weakness, internal tibial torsion, and arthritis. ITBS is characterised by pain on the outside of the knee, which may spread up the thigh to the hip. The pain is typically worse after striking the foot and may continue even after stopping exercise.
ITBS is relatively common in distance runners, but it may also occur in other sports such as cycling, skiing, rowing, and soccer. Basketball, hockey, and soccer players are also at risk, as are individuals with bowed legs, unequal leg lengths, knee arthritis, or weak hip, buttock, or abdominal muscles.
To prevent and treat ITBS, it is important to stretch and strengthen the muscles around the hip and knee. This includes exercises such as the runner's stretch, which also stretches the calf muscles and alleviates heel and foot pain. In addition, modifications to activities, such as lowering the bicycle seat for cycling, can help manage ITBS.
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Frequently asked questions
The knee is surrounded by several muscle groups, each of which helps maintain stability and move the knee joint through motion. The two main muscle groups that support the knee are the hamstrings and quadriceps. Other muscles that support the knee include the iliotibial (IT) band, hip flexors, and calf muscles.
The knee joint is the biggest joint in the body and is formed by the femur (thighbone), tibia (shinbone), and patella (kneecap). The knee is a hinge joint, allowing leg flexion and extension, and it supports your weight and lets your legs bend and move.
To keep your knees strong and healthy, it is important to stretch and strengthen the muscles that support the knee, such as the quadriceps, hamstrings, calf, and hip muscle groups. Maintaining a healthy weight can also help take the pressure off your knees.
