The Medial tibial spine is a small bony peak on the top of the tibia (shinbone) inside the knee joint. It sits between the inner (medial) and outer (lateral) tibial plateaus as part of the intercondylar eminence. Clinicians most often mention it when reading knee X-rays, MRI scans, or describing ACL-related injuries and tibial spine fractures.

Tibial eminence is a bony ridge on the top of the tibia (shinbone) inside the knee joint. It sits between the two tibial plateaus and helps form the center “spine” of the knee. It is an important attachment area for key stabilizing ligaments of the knee. Clinicians most often discuss it when evaluating ACL-related injuries, knee stability, and certain fractures.

Cruciate insertion refers to where a cruciate ligament attaches to bone inside the knee. It is most commonly used to describe the attachment sites of the ACL and PCL on the femur and tibia. Clinicians use the term in MRI reports, surgical planning, and operative documentation. It helps explain where an injury occurs and where reconstruction aims to restore anatomy.

The Infrapatellar fat pad is a normal pad of fatty tissue at the front of the knee. It sits just below the kneecap (patella) and behind the patellar tendon. Clinicians commonly discuss it in knee exams, MRI reports, and arthroscopic surgery. It can be involved in certain types of anterior (front-of-knee) pain.

Hoffa’s fat pad is a soft, fatty structure at the front of the knee. It sits just below the kneecap (patella) and behind the patellar tendon. It helps the knee move smoothly and can also be a source of front-of-knee pain. Clinicians commonly discuss it during knee exams, MRI reviews, and arthroscopic surgery planning.

The Trochlear groove is a shallow channel at the lower end of the femur (thigh bone). It is where the patella (kneecap) glides as the knee bends and straightens. Clinicians commonly discuss it when evaluating kneecap tracking, instability, and patellofemoral pain. It is also relevant in imaging reports and in some knee surgeries that involve the patellofemoral joint.

Trochlea is an anatomical term for a groove or pulley-shaped surface in a joint. In the knee, it most often refers to the femoral Trochlea, the groove where the kneecap (patella) glides. Clinicians use the word when describing patellofemoral anatomy, imaging findings, and causes of kneecap instability. It is also used in other joints (such as the elbow), but knee care commonly centers on the femoral Trochlea.

Patellar facets are the smooth joint surfaces on the underside of the kneecap (patella). They are covered by cartilage and glide against the femur in the patellofemoral joint. The term is commonly used in imaging reports, orthopedic exams, and surgical planning. It helps clinicians describe where patellofemoral cartilage wear, pain, or injury is located.

Tibial tubercle is a bony bump on the front of the shinbone (tibia), just below the kneecap (patella). It is where the patellar tendon attaches, making it a key part of the knee’s “extensor mechanism” (the straightening system). Clinicians use it as an anatomical landmark during exams and on imaging. It is also central to several knee conditions and surgeries involving patellar tracking and stability.

Subchondral bone is the layer of bone that sits directly under joint cartilage. It helps support the joint surface and manage forces that pass through the knee and other joints. Clinicians often discuss it when evaluating arthritis, cartilage injuries, and bone stress changes on imaging.