Meniscal extrusion means the knee’s meniscus has shifted outward beyond the edge of the tibia. It is usually described on MRI, and sometimes on ultrasound, as a measurement or graded finding. It often appears alongside meniscal tears, meniscal root injuries, and knee osteoarthritis. Clinicians use it to help explain symptoms and to understand how well the meniscus is functioning.

Posterior root tear is a specific type of meniscus injury near the back attachment point of the meniscus in the knee. In plain terms, it is a tear where the meniscus “anchors” to bone, which can change how the knee spreads load. The term is commonly used in orthopedics, sports medicine, radiology (MRI reports), and physical therapy documentation. This overview is informational and focuses on definitions and clinical concepts rather than personal treatment guidance.

Meniscal root tear is an injury to the “root” attachment of the meniscus where it anchors to the tibia (shinbone). It is commonly discussed in orthopedic clinics when evaluating knee pain, swelling, and mechanical symptoms. Because the meniscal root helps the meniscus function like a load-sharing ring, a tear can change knee mechanics. The term is used in sports medicine, physical therapy, and imaging reports (especially MRI).

A Flap meniscus tear is a type of meniscal tear where a piece of the meniscus partly separates and forms a “flap.” It is commonly discussed in knee injury diagnosis, MRI reports, and arthroscopy findings. It can occur in the medial or lateral meniscus and may cause catching or sharp pain with motion. Clinicians use the term to describe tear shape and stability, which can influence treatment planning.

A Complex meniscus tear is a meniscus injury with more than one tear pattern in the same area. It commonly involves fraying, splitting, or multiple tear directions that make the tissue less stable. It is a clinical and imaging term used in orthopedics, sports medicine, and radiology. It helps describe why knee pain, catching, swelling, or reduced motion may occur.

A Horizontal meniscus tear is a split within the meniscus that runs parallel to the tibial surface. It can separate the meniscus into an upper and a lower layer (often called “leaflets”). It is commonly discussed in orthopedic clinics when evaluating knee pain, swelling, and mechanical symptoms. It is also a frequent MRI finding, especially in adult and older patients.

A Radial meniscus tear is a specific tear pattern in the knee’s meniscus cartilage. It runs from the inner free edge of the meniscus toward the outer rim, like a spoke in a wheel. Clinicians use this term to describe what the tear looks like and how it may affect knee mechanics. It is commonly discussed in sports medicine, orthopedics, and physical therapy when evaluating knee pain and catching.

Bucket-handle tear is a specific pattern of meniscus tear inside the knee joint. It often involves a long, vertical tear where a strip of meniscus displaces inward like a “handle.” It is commonly discussed in orthopedics, sports medicine, and radiology because it can cause knee locking. It is used as a descriptive diagnosis that helps guide evaluation and treatment planning.

A Lateral meniscus tear is an injury to the cartilage cushion on the outer side of the knee. It can happen suddenly with twisting or develop gradually with wear over time. It is commonly discussed in sports medicine, orthopedics, and physical therapy when evaluating knee pain or mechanical symptoms. It is also a frequent diagnosis on knee MRI reports and arthroscopy findings.

A Medial meniscus tear is an injury to the inner (medial) meniscus of the knee. The meniscus is a C-shaped pad of fibrocartilage that helps the knee bear load and move smoothly. This term is commonly used in orthopedics, sports medicine, emergency care, and physical therapy. It is discussed when knee pain, swelling, catching, or mechanical symptoms suggest meniscal damage.