Runner’s knee, medically termed Patellofemoral Pain Syndrome (PFPS), is characterized by diffuse anterior knee pain that originates from the articulation between the patella (kneecap) and the femur.
It is one of the most common musculoskeletal complaints among runners, cyclists, and athletes, accounting for up to 25% of all knee injuries seen in sports medicine (Crossley et al., Br J Sports Med, 2016).
PFPS results from abnormal patellar tracking and excessive patellofemoral joint stress, leading to irritation of subchondral bone, synovium, or retinacular soft tissues.
Despite its name, the condition is not limited to runners — it also affects individuals who engage in prolonged sitting, stair climbing, or squatting.