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I had been to the doctor and had scheduled an MRI about the time I ordered the ice and Inferno wraps. I kept moving the MRI date up because I could tell my knee was beginning to heal. I cancelled my MRI appointment a couple of weeks ago and I am back to my full workout schedule.
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Anatomy of the Knee
The knee is the largest joint in your body and one of the most easily injured. It is a pivotal hinge joint in the leg that allows for a variety of movements (i.e. flexion, extension, medial rotation, and lateral rotation) and it connects the tibia and the fibula, with the thigh bone (femur). The soft tissue in the knee joint (tendons, ligaments, menisci, cartilage) that provides stability in the knee and hold the bones together at the joint.
Patella (Knee Cap)
Your patella, or knee cap, is a circular-triangular bone, approximately 2 inches across, that is embedded between the quadriceps tendon above and patellar tendon below. Bones embedded in tendons are called sesamoid bones and they protect the tendons and improve the function of the joint by holding the tendons away from the center of the joint. The patella is the larger sesamoid bone in your body and rests over a groove at the bottom of the femur and the top of the tibia. It protects the bones and soft tissue in your knee joint and slides when your knee moves, allowing leverage in your leg muscles.
Knee Tendons and Ligaments
The patellar ligament (also referred to as the patellar tendon) is located below the patella. It is approximately 4 inches long and inserts at the top of the tibia and spreads over top of the patella where it connects to the quadriceps tendon. The patella tendon is most commonly injured or inflicted with tendonitis, known as Jumper's Knee (patellar tendonitis).
The upper leg muscles provide your knees with mobility (extension, flexion and rotation) and strength. The quadriceps muscles located at the front of your thigh (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius), allow you to straighten your legs and the hamstring muscles, located on the back of your thigh (semitendinosus, semimembranosus, biceps femoris), allow you to bend your knees. The tendon of the quadriceps runs from the quadriceps muscles, down both sides of the patella and join on either side of the tibia. This tendon is susceptible to quadriceps tendinitis.
Ligaments are strong, elastic-like tissues that connect bone to bone and provide stability and protection to your knee joint by limiting the forward and backward movement of the shin bone. There are four ligaments in the knee joint that connect the femur and tibia; the anterior cruciate ligament (ACL), the posterior cruciate ligament (PCL), the medial collateral ligament (MCL), and the lateral collateral ligament (LCL).
- The ACL is in the center of the knee, it limits rotation and forward leg movements.
- The PCL is in the center of the knee, it limits backward leg movements.
- The MCL runs along the inside of the knee joint, it provides stability to the medial (inner) part of the knee.
- The LCL runs along the outside of the knee joint, it provides stability to the lateral (outer) part of the knee.
The knee ligament that is most frequently injured is the anterior cruciate ligament. A pivot, twist or over-extension of the knee can lead to an ACL strain or tear.
Lateral Meniscus and Medial Meniscus
The menisci are crescent shaped wedges located in the knee joint at the bottom of your thigh bone and on top of the flat upper surface of your shin bone. They are made of a dense, collagen connective tissue that is tougher than articular cartilage, called fibro-cartilage. Menisci cover approximately 2/3 of your tibia surface and are thinner on the inside and thicken toward the outer peripheral. They fill the space between these bones and cushion your femur (similar to shock absorbers) so it doesn't rub against your tibia or slide off.
When you walk, your weight shifts from one meniscus to the other which can increase the forces on your knee by up to 2 - 4 times your body weight; when you run the forces increase up to 6 - 8 times your body weight, and are even higher when landing from a jump.
The menisci help distribute the weight of your body across your knee joint, lubricate and protect the articular cartilage from damages from wear and tear, stabilize your knee when you slide and turn, and limit extreme knee flexion and extension. Due to the weight bearing and stabilizing function of the menisci they are very strong, but they are also quite prone to a meniscus tear.
There are 2 menisci - the lateral meniscus (located on the outside of your knee) and the medial meniscus (located on the inside of your knee).
The lateral meniscus is more of an o-shape, and although it is slightly shorter in length, it covers a larger portion of the tibia surface. It is very mobile and is only attached to the tibia on the outside and back of your joint. It slides forwards and backwards, moving freely in the joint, absorbing up to 80% of the load applied to the outside of your knee. The lateral meniscus is less likely to be injured or torn by force, because it can move and change shape.
The medial meniscus is about 3.5cm in length and more of a c-shape, resembling a wedge of an orange. It is tightly attached to the tibia and joint capsule on the back and inside of your knee. It helps the ACL and MCL stabilize your knee, absorbing up to 50% of the load applied to the inside of the knee. The medial meniscus is quite inflexible and does not move freely in the joint, therefore, it is torn more frequently than the lateral meniscus.
Bursae in the Knee
In amongst the bones, tendons, and ligaments rest bursa sacs that function as cushions to reduce friction and allow your soft tissue to slide easily and comfortably within your knee. The bursae are lined with synovial cells that secret a fluid rich in protein and collagen and act as the lubricant between areas in your knee where friction (rubbing) is greatest.
There are 4 major bursa in your knee including the prepatellar bursa, supra-patellar bursa, infra-patellar bursa, and pes anserine bursa. With too much friction or pressure on the bursae, they can become irritated and inflamed. This is a condition called bursitis. Prepatellar bursitis and pes anserine bursitis are the most common types of bursitis pain in the knees.
Articular Cartilage and Synovial Fluid
Articular cartilage, also known as hyaline cartilage, is a type of slick, hard, bone-like, flexible connective tissue that covers the surface ends of the tibia and femur at your knee joint, reducing friction and allowing the bones to move easily against one another. It is generally 1/8 to 1/4 inch thick.
Synovial fluid is a thick, stringy, yolk-like fluid that is secreted by the synovial tissue inside the knee capsule. It nourishes the cartilage and lubricates the knee joint.
Wear and tear in the knee joint can cause the protective cartilage to begin to break down. When this occurs it is called osteoarthritis and if left untreated, it can lead to permanent cartilage loss and chronic knee pain.
Some Facts About Knees:
Approximately 19.4 million visits to physicians' offices in the US per year are due to knee problems.
The knee is a complex joint with many components, making it vulnerable to a variety of injuries.
Oral medications can mask the pain but do not aid in the healing of knee injuries.
Most knee injuries can be successfully treated without surgery.
Sadly, regardless of treatment, ACL injuries in high-school youths are associated with a 10-fold increased risk for degenerative knee arthritis later in life.
MendmyKnee (a division of MendMeShop) is an FDA registered company. This means our products are of very high quality, made from biocompatible materials.
Every year, at least 1 in 3000 Americans between ages 14 and 55 tear an anterior cruciate ligament (ACL).
Our products are currently in use by NFL players, PGA tour golfers, senators, kings (yes, royalty), elite marathon runners, martial arts academies, hollywood actors and actresses, professional trainers, european football players, rugby players and people all over the world with soft tissue injuries just like you.