The knee is a hinge joint which is located between the femur in the upper leg, the tibia and fibula in the lower leg and the patella it is the largest most complicated joint of its kind in the human body. This joint is the main reason we can walk as it is strong and durable while maintaining the wide range of motions necessary for locomotion. There are many internal and external ligaments that reinforce the knee as it holds up the entire body’s weight with little reinforcement from the surrounding bones, it is this lack of reinforcement allows the knee to slightly rotate when flexed while also allowing a large degree of flexion. The fibrocartilage called the meniscus found between the femur and tibia acts as a shock absorber to prevent collisions
...cient knee during activities of daily living, as they have yet to be determined ⁷². In understanding the factors contributing to the mechanism of non-contact ACL injury, investigators should consider whether the kinematics, kinetics and muscle activation strategies observed are the cause of increased ACL strain or compensation for other kinetic chain insufficiencies ²⁹. Further knowledge on how movement patterns and other kinetic chain structures affect ACL loads prove critical in enhancing future prevention strategies ²⁹ ³⁴. As with reconstruction, rehabilitation should aim to aid the knee in attaining its near-normal function ⁵⁵. Through producing rehabilitation programmes built around existing knowledge on the biological and mechanical properties of the ACL, objectives such as reduced pain, greater ROM and improved muscle function can be achieved ⁵⁵.
Nisell R. (1985) Mechanics of the knee: A study of joint and muscle load with clinical applications. Acta Orthop Scand 216; 1-42.
The knee joint is formed by the articulation of the distal end of the femur and the proximal end of the tibia. The fibula is only involved to the extent that it serves as an attachment site for connective tissue. In this paper, the anatomy of the joint will be discussed.
The anterior cruciate ligament (ACL) is one of the most important of your four major knee ligaments. The function of the ACL is to provide stability to the knee and minimize stress across the knee joint. It restrains excessive forward movement of the lower leg bone (the tibia) in relation to the thigh bone (the femur). It also limits rotational movements of the knee. “Greater external knee valgus and internal rotation moments have been shown to increase loading on the ACL in vitro and are thought to be associated with the increased risk of noncontact ACL injury” (Effects 2011). A tear to the anterior cruciate ligament results from overstretching of this ligament within the knee. It’s usually due to a sudden stop and twisting motion of the knee, or a “...
The most common knee injury in sports is damage to the anterior cruciate ligament (ACL) through tears or sprains. “They occur in high demand sports that involve planting and cutting, jumping with a poor landing, and stopping immediately or changing directions” (University of Colorado Hospital). The ACL is a ligament that runs diagonally in the middle of the knee and found at the front of the patellar bone. Its function involves controlling the back and forth motion of the knee, preventing the tibia from sliding out in front of the femur, and providing rational stability to the knee. Interestingly, women are more prone to ACL injuries than men. The occurrence is four to six times greater in female athletes.
To understand the importance of the ACL, the knee as a whole must be examined. The knee is formed by the femur, the tibia, and the patella. Several muscles and ligaments control the motion of the knee and protect it from damage at the same time. Ligaments are dense structures of connective tissue that fasten bone to bone and stabilize the knee. Two ligaments on either side of the knee, called the medial and lateral collateral ligaments, stabilize the knee from side-to-side. The ACL along with the posterior cruciate ligament are of a pair of ligaments in the center of the knee joint that form a cross. T...
Instead of moving sideways and up and down, the knee only serves as a pivot for flexion (bending) and extension (straightening); it holds the tibia and femur in place (northstar). In the northstar web page it is stated that, “The anterior cruciate ligament is one of the most important ligaments to athletes because of its main function, stabilization of the joint while decelerating.” In other words, it is the reason that we can stop abruptly without our leg collapsing. Obviously this asset makes it essential to have a functioning ACL while playing sports. It is an especially common injury in soccer, which is a game of constant abrupt stops.
In orthopedic surgery, iliac bone graft which is commonly used for treatment nonunion or spinal fusion is contained multipotential stem cells or mesenchymal progenitor cells. These cells are found approximately 1 in 10,000 nucleated cells in the bone marrow. Friedenstein et al. (1970) reported that a rare population of cells was found by plastic-adherent ability (Friedenstein et al., 1970). These cells are capable of proliferation and mesenchymal lineages differentiation (Pittenger et al., 1999, Caplan, 1991). Unique antigens of MSCs (hMSCs) are controversy and the limited popularity of sorting cells techniques are not as widely used as gradient media in MSC isolation. Most MSC populations have been isolated by plastic adherent ability which is similar to that originally used by Friedenstein. Direct BM plating method is commonly used for cells from small animal (Lennon and Caplan, 2006, Nadri et al., 2007) but in human bone marrow, Density gradient centrifugation is the most commonly used method for isolating MSCs.
Sports Medicine is a medical field that specializes with physical fitness, treatment and prevention of injuries related to sports and exercise. It was introduced around the early Greek and Roman era when the first modern Olympic Games took place. The Greek felt they could do something to help heal and prevent injuries that the athletes were receiving. Now in sports medicine, certain injuries can only be assessed and treated by specific physicians. These physicians can include physical therapists, athletic trainers, and strength and conditioning coaches. Although sports physicians are most commonly seen by athletes after they are hurt so they can be treated, there are some physicians that are seen before an injury occurs so that they can learn how to prevent injuries.
Ligaments are tough, non-stretchable fibers that hold bones together. Damage to cruciate ligaments, which crisscross the knee to give it stability, is one of the most common sports injuries. The “tear” occurs from changing direction rapidly, slowing down from running, or landing from a jump improperly. The A.C.L tear is one injury that worries athletes in all sports at all levels because of its devastating effects. People ages 15-25 that participate in basketball and other sports that require pivoting are especially at risk.
Amanda was in her sophomore year of soccer season when she heard the pop of her knee that cut her season short. The next thing she knew she was at the doctor’s who told her she had an ACL tear, and wasn’t sure if she could play again. From there it was boiled down to two options. One to re-strengthen her knee through rehabilitation, physical therapy and bracing, or to undergo an ACL reconstruction surgery. Although it is costly and some may consider it frivolous, those who have encountered ACL tears should receive the reconstruction surgery instead of attending rehabilitation for the damage to their knee, because it dramatically lessens the chances of meniscal injuries and osteoarthritis occurring later and allows the patient to return back to their sport or physical activity with better knee mobility and less pain in a timely manner.
The word patella comes from the great latin language meaning shallow pan or shallow dish. The description of that word could not be more correct, it was meant in reference to balance of food but in anatomy’s case a balance of the body. The patella is a small bone located in front of the knee joint where the thigh bone (femur) and shinbone (tibia) meet. It protects the knee and connects the muscles in the front of the thigh to the tibia. The patella is one of two sesamoid bones found in the body, roughly triangular shaped in size. It’s thick consistency allows for the articulation of the femur, which in turn allows for body support and balance. The patella has multiple body functions with the primary being knee extension. The patella is essential for basic body functions including locomotion;
In order to understand how the menisci can be injured, you must understand the basic anatomy of the menisci and why they are important. The menisci are two oval (semilunar) fibrocartilages that deepen the articular facets of the tibia and cushion any stresses placed on the knee joint. They enhance the total stability of the knee, assist in the control of normal knee motion, and provide shock absorption against compression forces between the tibia and the femur (Booher, 2000). Articular cartilage covers the ends of the bones that make up the joint. The articular cartilage surface is a tough, very slick material that allows the surfaces to slide against one another without damage to either surface. This ability of the meniscus to spread out the force on the joint surfaces as we walk is important because it protects the articular cartilage from excessive forces occurring in any one area on the joint surface, leading to degeneration over time (Sutton, 1999).
A 16 year old, female high school soccer player, Lindsey Robinson tore her anterior cruciate ligament (ACL) from a soccer game. Interestingly, she was not the only one in her team who injured her ACL, but also several of her teammates have torn the same ligament as well during the soccer season. Lephart (2002) found that women involved in physical activity are more susceptible to acquire the ACL injuries than men who are involved in the same physical activity (as cited in Ogden, 2002). According to “ACL Injury Prevention” (2004), the numbers on female ACL ruptures have been increased for the past ten year. Over 1.4 million women have been suffered from the ACL rupture which is twice the rate of the previous decade. Therefore, female ACL injuries are now a growing problem in the nation (Anonymous, 2004). Back in 1950s and 1960s, female participation in sports was rare; therefore, the rate of injuries was very low. However, according to “ACL Injuries and Female Athletes” (n.d), as Title IX was implemented in 1972, female participation in numerous sports has dramatically increased. Moreover, the rate of acquiring injuries to the ACL also has dramatically increased (Anonymous, n.d). In terms of comparing the rate of acquiring ACL injuries between two genders, females have higher rate than males do. According to the “Physical Therapy Corner” (2007), “women suffered anterior cruciate ligament injuries more often than men, nearly 4 times as often in basketball, 3 times as often in gymnastics, and nearly 2 and a half times as often in soccer” (Knee Injuries section, para.1). There are various risk factors that contribute to the high rate of acquiring injuries to the ACL for female athletes. External factors such as improper sh...
The purpose of the squat is to train the muscles around the knees and hip joints, as well as to develop strength in the lower back, for execution of basic skills required in many sporting events and activities of daily living. Because a strong and stable knee is extremely important to an athlete or patient’s success, an understanding of knee biomechanics while performing the squat is helpful to therapists, trainers, and athletes alike (11). Because most activities of daily living require the coordinated contraction of several muscle groups at once, and squatting (a multi-joint movement) is one of the few strength training exercises that is able to effectively recruit multiple muscle groups in a single movement, squats are considered one of the most functional and efficient weight-bearing exercises whether an individual’s goals are sport specific or are for an increased quality of life