Final answer:
A tangential projection of the patella can demonstrate the alignment and position of the patella within the knee joint and is used to evaluate conditions like patellofemoral syndrome.
Step-by-step explanation:
A tangential projection of the patella can demonstrate the alignment and position of the patella within the knee joint. It can show if the patella is properly tracking along the groove on the distal femur or if there are any abnormalities such as dislocation or subluxation. This projection is often used to evaluate conditions like patellofemoral syndrome where the patella is not properly aligned with the femur.