Pes anserine tendinopathy is irritation or degeneration of tendons on the inner (medial) side of the knee. It involves the “pes anserinus,” where three thigh muscles attach to the upper shinbone (tibia). It commonly shows up as localized pain below the knee joint line, especially with activity. The term is used in orthopedics, sports medicine, and physical therapy when evaluating medial knee pain.

Pes anserine bursitis is inflammation of a small fluid-filled sac (a bursa) on the inner side of the knee. It typically causes tenderness and aching pain below the medial (inner) joint line on the shinbone (tibia). The bursa sits under the “pes anserinus” tendons, where three thigh muscles attach near the knee. The term is commonly used in orthopedics, sports medicine, and physical therapy when evaluating inner-knee pain.

Patellar crepitus is a crackling, grinding, or “crunching” sensation felt or heard around the kneecap during knee movement. It is a clinical finding that can be painless or associated with discomfort. The term is commonly used in orthopedic, sports medicine, and physical therapy exams. It usually refers to friction or irregular motion in the patellofemoral joint (kneecap and thigh bone).

Patellofemoral chondrosis is a term for wear, softening, or damage of the joint cartilage in the patellofemoral joint. The patellofemoral joint is where the kneecap (patella) glides on the groove at the end of the thigh bone (femur). Clinicians use this term in imaging reports, arthroscopy findings, and clinical discussions of front-of-knee pain. It helps describe cartilage condition, not a single treatment or procedure.

Patellofemoral arthritis is arthritis that affects the joint between the kneecap (patella) and the thigh bone (femur). It involves wear, damage, or degeneration of the cartilage in the front compartment of the knee. It is commonly discussed in orthopedics, sports medicine, and physical therapy when evaluating “front of knee” pain. It can occur on its own or alongside arthritis in other parts of the knee.

Patellar fracture means a break in the patella, also called the kneecap. It is a knee injury that can affect walking, straightening the leg, and kneeling. It is commonly discussed in emergency care, orthopedics, sports medicine, and physical therapy settings. Clinicians use the term to describe the diagnosis and to guide imaging, treatment planning, and rehabilitation.

Chondral defect patella means damage to the smooth cartilage surface on the underside of the kneecap (patella). It describes a cartilage “wear spot” or injury within the patellofemoral joint (kneecap and thighbone). Clinicians use this term in exams, imaging reports, and surgical findings to label a specific type of knee joint surface problem. It is a diagnosis and description, not a single treatment.

Chondral defect trochlea means damage to the smooth cartilage surface in the trochlea of the femur. The trochlea is the groove at the end of the thighbone where the kneecap (patella) glides. This term is commonly used in knee MRI reports, arthroscopy findings, and surgical planning. It helps describe a specific cause of patellofemoral (kneecap-related) knee pain and dysfunction.

Medial plica is a fold of synovial tissue inside the knee joint. It is a common normal anatomical structure that develops early in life. It is most often discussed when it becomes irritated and contributes to knee pain.

Plica syndrome is a condition where a normal fold of knee lining tissue becomes irritated and painful. It most often involves the front and inner side of the knee near the kneecap. It is discussed in orthopedics, sports medicine, and physical therapy when knee pain is triggered by bending and activity. It can resemble other common knee problems, so it is often considered as part of a broader evaluation.