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Loud Pop in Knee followed by Pain

If you hear a loud pop in your knee and then experience pain, it’s possible that you have torn a ligament. Ligaments are the bands of tissue that connect bones to other bones and help stabilize the joint. There are four main ligaments in the knee: the anterior cruciate ligament (ACL), posterior cruciate ligament (PCL), medial collateral ligament (MCL), and lateral collateral ligament (LCL).

The ACL is the most commonly injured ligament in the knee. It runs diagonally across the front of the knee and is responsible for rotational stability. A tear in the ACL can cause severe pain, swelling, and instability in the knee.

If you have a torn ACL, you may hear or feel a loud pop in your knee. You may also experience sudden swelling around the knee, especially when bearing weight on that leg. The knee may give out or buckle, and it will be very tender to the touch. If you suspect an ACL tear, see a doctor immediately for an examination and follow-up evaluation with MRI imaging.

ACL Tears

The Anterior Cruciate Ligament (ACL) is one of four major ligaments in the knee. It is an important stabilizer of the knee and prevents the shin bone (tibia) from sliding in front of the thigh bone (femur). The ACL is susceptible to injury. It is most likely to be injured during activity or by impact. A torn ACL is a common injury for athletes at all levels, but it is most common for people who are active or who experience impact injuries to the knee. ACL injuries can happen to anyone of any age, condition, or ability, and it can be injured in many ways. Examples include abruptly changing direction, slowing down while running, landing incorrectly, or getting struck by someone or some object.

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LCL Tear

A strain or tear to the lateral collateral ligament (LCL) is known as an LCL injury. The LCL is a band of tissue that runs along the outer side of your knee. It aids in keeping the bones together while you walk, ensuring that your knee joint remains stable. How you feel and what type of treatment you’ll require depends on how severely your LCL has been stretched or torn. If it’s only a minor sprain, self-care at home might help. However, if it’s a significant tear, you may need physical therapy, an injection-based procedure, or surgery. Orthopedists categorize LCL tears into 3 grades…

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MCL tear

The medial collateral ligament AKA MCL is a thick, strong band of connective tissue on the inside portion of your knee. It connects the top part of the tibia (shin) to the bottom part of the femur (thigh). This is a vital ligament that works along the lateral collateral ligament (LCL), anterior cruciate ligament (ACL), and posterior cruciate ligament (PCL) to bring stability, structure, and movement to the knee. The MCL provides support and stability for the inside (medial) aspect of the knee. MCL tears are a common injury in sports such as football, hockey, and skiing. The ligament can…

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Patellar Tendon Tear

The Patellar tendon is the thick connective tissue that starts at the base of the kneecap (Patella) and extends down to the shin.  The is an extension of the Quadriceps tendon (1).  The Quadricep is the large thick muscle that is often referred to as our thigh. The Patellar tendon works together with the Quadriceps muscle to straighten (extend) the knee. It is easy to touch your Patellar tendon as it is immediately below the knee cap. There are many different causes of Patellar tendon tears.  Patellar tendon tears are a common sport injury but can also occur from overuse or a motor vehicle injury…

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PCL Tear

The Posterior Cruciate Ligament (PCL) is a paired ligament in the middle of the knee. It is made up of two separate bundles: ALB (anterior lateral bundle) and PMB (posterior medial bundle). These bundles work synergistically to provide stability. The PCL plays an important stabilizing role in the knee joint by resisting excessive posterior translation of the tibia relative to the femur. Between 90 and 120 degrees of knee flexion, it serves as secondary support for preventing excessive rotation. PCL tears happen when force is applied beyond what the PCL tensile strength is capable of resisting. The tensile strength of the PCL is well documented…

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