Introduction
The knee, being the largest joint in the body, is particularly susceptible to injuries. It can be affected by various factors such as sports, occupational hazards, diseases, aging, and general wear and tear. Arthroscopic knee surgery, or arthroscopy, is a highly effective method for diagnosing and treating knee-related issues.
Arthroscopy enables surgeons to visualize and address problems within the knee joint without the need for large incisions that can damage surrounding tissues. This minimally invasive technique uses small incisions and a viewing instrument known as a "scope." As a result, it carries a lower risk of infection and allows for a quicker recovery compared to traditional surgical methods.
Anatomy
The knee joint is complex, consisting of three primary bones: the femur (thighbone), the tibia (larger leg bone), and the patella (kneecap). The patella moves along a groove at the femur's end. Major muscle groups in the thigh contribute to the knee's strength and stability.
Four key ligaments connect the bones of the knee. The medial collateral ligament (MCL) runs along the inner knee, while the lateral collateral ligament (LCL) is found on the outer side. These ligaments provide stability and help resist lateral movements.
Inside the knee, the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) cross each other, maintaining the joint's alignment and controlling forward and backward movements. They also enable rotational motion, which is crucial for activities like running or turning.
Two cartilage discs known as menisci are located at the tibia's ends. These cartilages create a smooth surface for the bones, allowing for fluid movement and acting as shock absorbers during activities like walking or running.
A protective capsule surrounds the knee bones, lined with a thin synovial membrane that secretes synovial fluid, acting as a lubricant and cushion for the joint, enabling smooth and pain-free motion.
Causes
Knee issues may arise from injuries, degenerative conditions, or the natural aging process. Injuries can lead to ligament tears, especially during sports activities. The MCL is particularly prone to tears in football, basketball, and volleyball, while the ACL and PCL are often injured in football.
Meniscal injuries frequently occur when the femur rotates sharply while the tibia remains still, causing tears during activities like football tackles.
Overuse and degeneration can lead to inflammation of the ligaments and synovial membrane, resulting in pain and swelling. Conditions such as rheumatoid arthritis or gout can also contribute to inflammation and deterioration of the knee bones. Injuries can lead to fractures or misalignment of the patella, which is often fractured due to direct impacts.
Symptoms
Key indicators of knee injuries include swelling and persistent pain. Individuals may experience a sensation of the knee "catching" during movement or sudden instability, causing falls.
Diagnosis
To evaluate knee issues, doctors will review medical histories, perform physical exams, and analyze medical imaging. They will inquire about symptoms and the nature of any injuries. The doctor will examine the knee and leg alignment, assessing muscle strength and joint motion through simple movements.
X-rays can reveal bone conditions and arthritis, while MRIs provide detailed images of the knee structure, helping identify soft tissue injuries that X-rays may miss. The MRI procedure is painless, requiring patients to remain still during the imaging process.
Treatment
Most knee conditions respond well to non-surgical treatments, including medication, bracing, and physical therapy. Arthroscopy is considered when conservative measures yield insufficient improvement. This procedure is often utilized to reconstruct ligaments or repair damaged cartilage, synovium, or bone fragments.
Surgery
Arthroscopic knee surgeries are typically outpatient procedures. Before surgery, patients undergo a physical examination. Anesthesia options include sedation, local anesthesia (numbing the knee area), or general anesthesia.
During the procedure, the surgeon elevates the leg and applies a tourniquet to limit blood flow. One or more small incisions (¼” to ½”) are made near the joint, and a sterile saline solution is injected to enhance visibility. An arthroscope is inserted, providing a view of the joint structures.
If additional treatment is necessary, the surgeon may make extra small incisions to insert slender surgical instruments. Post-procedure, a pain-relieving medication may be injected into the joint, and the incisions will be closed with stitches or Steri-Strips.
Recovery
Post-surgery, patients are advised to elevate their leg and apply ice to minimize pain and swelling. Activity restrictions may be advised, including the use of a knee brace. Patients may initially require mobility aids such as crutches or a walker.
Weight-bearing recommendations will depend on the specific procedure. Physical therapy is essential for regaining movement and strength in the knee.
Recovery timelines vary based on the severity of the condition and the complexity of the surgery, with full recovery generally taking several weeks to months. Temporary or permanent physical activity restrictions may be implemented based on the injury type, especially for those who had meniscal removal or significant ligament injuries.
To prevent future injuries, patients should consult their surgeon about activity guidelines and engage in exercises to strengthen the muscles around the knee joint.
