{"id":10015,"date":"2023-08-30T00:29:34","date_gmt":"2023-08-29T22:29:34","guid":{"rendered":"https:\/\/pes-luxembourg.lu\/bascharage\/2023\/08\/30\/the-knee-a-key-joint-in-our-daily-movements\/"},"modified":"2024-01-19T13:44:54","modified_gmt":"2024-01-19T12:44:54","slug":"the-knee-a-key-joint-in-our-daily-movements","status":"publish","type":"post","link":"https:\/\/pes-luxembourg.lu\/bascharage\/en\/the-knee-a-key-joint-in-our-daily-movements\/","title":{"rendered":"The knee: a key joint in our daily movements"},"content":{"rendered":"
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The knee: a key joint in our daily movements<\/h1><\/span>
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The knee joint is one of the most complex and stressed joints in the human body.<\/p>\n<\/div>

The bones that make up the knee<\/h2><\/div>

The femur<\/h3>\n

The femur is the longest and strongest bone in the human body. It extends from the hip to the knee, forming the upper part of the knee joint. The lower end of the femur has two condyles, the medial and lateral, separated by an intercondylar zone. The condyles are large, rounded protuberances that come into contact with the tibia to allow movement of the knee.<\/p>\n

The patella<\/h3>\n

The patella is a small, triangular-shaped bone at the front of the knee. It is embedded in the tendon of the quadriceps femoris, the main muscle responsible for knee extension. The posterior surface of the patella is covered with cartilage and slides against the femoral trochlea, a groove located at the lower end of the femur. The patella plays an essential role in knee mechanics, acting as a lever to facilitate joint extension.<\/p>\n

The tibia<\/h3>\n

The tibia is the longest and thickest bone in the leg, located on the inside of the leg, parallel to the fibula. The upper end of the tibia has two plates, the medial tibial plate and the lateral tibial plate, which are covered in cartilage and come into contact with the femoral condyles to form the femorotibial joint. Between the two plates lies the tibial spine, a bony structure that anchors the knee’s cruciate ligaments.<\/p>\n

The fibula<\/h3>\n

The fibula is a long, thin bone located on the outside of the leg, parallel to the tibia. Although not directly involved in the knee joint, it is important for leg and ankle stability. The upper end of the fibula, called the fibular head, is connected to the tibia by ligaments, forming the proximal tibiofibular joint.<\/p>\n

In conclusion, the knee joint is made up of three main bones: the femur, the patella and the tibia. Together, they provide a wide range of movement and stability for walking, running and other daily activities. Although not directly involved in the knee joint, the fibula contributes to the overall stability of the leg. Understanding these bone structures and how they interact is essential to understanding how the knee joint functions, and to identifying and treating any problems that may arise.<\/p>\n<\/div>

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Muscles around the knee<\/h2><\/div>

The knee joint is a complex structure essential to the mobility and stability of the human body. The muscles that surround it play a vital role in knee function, enabling flexion, extension and rotation of the leg.<\/p>\n

The main muscle groups of the knee :<\/p>\n

The quadriceps femoris<\/h3>\n

The quadriceps femoris is a group of four muscles located at the front of the thigh. It comprises the vastus lateralis<\/strong>, vastus medialis<\/strong>, vastus intermedius<\/strong> and rectus femoris<\/strong>. These muscles converge to form the quadricipital tendon, which inserts onto the patella. The quadriceps femoris is responsible for knee extension, enabling the leg to be extended.<\/p>\n

Hamstrings<\/h3>\n

The hamstrings are a group of three muscles located at the back of the thigh, comprising the biceps femoris<\/strong> (with its two chiefs: long and short), the semitendinosus<\/strong> and the semimembranosus<\/strong>. These muscles are mainly responsible for knee flexion, i.e. bending the leg. The biceps femoris is also involved in external rotation of the knee.<\/p>\n

The muscles of the crow’s feet<\/h3>\n

The crow’s-feet muscles are a group of three muscles that insert onto the medial part of the tibia, forming a fan-shaped arrangement. They include the sartorius<\/strong>, gracilis<\/strong> and semitendinosus<\/strong>. These muscles help stabilize the knee and contribute to knee flexion and internal rotation of the leg.<\/p>\n

The popliteus muscle<\/h3>\n

The popliteus muscle is a triangular muscle located at the back of the knee, extending from the femur to the tibia. It is responsible for internal rotation of the tibia during knee flexion, and helps stabilize the joint.<\/p>\n

The gastrocnemius muscle<\/h3>\n

The gastrocnemius muscle is the most superficial muscle in the posterior part of the leg. It has two heads, the medial and lateral, which originate on the femur and join to form the Achilles tendon. Although primarily responsible for ankle plantar flexion, the gastrocnemius also contributes to knee flexion.<\/p>\n<\/div>

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The ligaments that make up the knee joint<\/h2><\/div>

The ligaments surrounding the knee play a crucial role in maintaining stability and supporting the joint during movement.<\/p>\n

The main knee ligaments :<\/p>\n

The anterior cruciate ligament (ACL)<\/h3>\n

The ACL is a ligament located in the center of the knee joint, connecting the tibia to the femur. It is responsible for preventing excessive anterior translation of the tibia relative to the femur and stabilizing the knee during rotational movements. The ACL is one of the most frequently injured ligaments in the knee, particularly in athletes.<\/p>\n

The posterior cruciate ligament (PCL)<\/h3>\n

The PCL is also located in the center of the knee joint, parallel to the ACL. It also connects the tibia to the femur, preventing excessive posterior translation of the tibia. The PCL is less frequently injured than the ACL, but is just as important for knee stability.<\/p>\n

The tibial collateral ligament (TCL) or medial collateral ligament (MCL)<\/h3>\n

The LCT is a ligament located on the medial side of the knee, connecting the femur to the tibia. It is responsible for preventing excessive valgusization of the knee (outward movement) and stabilizing the joint during flexion and extension.<\/p>\n

The collateral fibular ligament (CFL) or lateral collateral ligament (LCL)<\/h3>\n

The LCF is located on the lateral (outer) side of the knee, connecting the femur to the fibula. It prevents excessive varization of the knee (inward movement) and helps stabilize the joint.<\/p>\n

The meniscofemoral ligaments<\/h3>\n

There are two meniscofemoral ligaments: the anterior meniscofemoral ligament and the posterior meniscofemoral ligament. These ligaments connect the menisci, which are cartilage discs between the tibia and femur, to the femur. They help stabilize the menisci and distribute forces during knee flexion and extension.<\/p>\n<\/div>

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Knee menisci<\/h2><\/div>

Among the many structures that make up the knee, the menisci are essential for ensuring stability, mobility and load distribution within the joint.<\/p>\n

Meniscus structure and function<\/h3>\n
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  1. Meniscus composition<\/strong><\/li>\n<\/ol>\n

    Menisci are crescent-shaped discs of cartilage located between the femur (thigh bone) and the tibia (leg bone). There are two menisci in every knee: the medial meniscus, on the inside of the knee, and the lateral meniscus, on the outside. These discs are composed mainly of fibrocartilage, a tough, elastic tissue.<\/p>\n

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    1. Main functions of menisci<\/strong><\/li>\n<\/ol>\n

      The menisci perform several functions that are essential for the proper functioning of the knee:<\/p>\n