What is the range of flexion at the knee joint?

The range of flexion at the knee joint is generally accepted to be from 0 degrees (fully extended) to about 135 degrees (maximum flexion during activities such as squatting or sitting). This range is important for understanding normal knee function, especially in contexts such as rehabilitation, sports medicine, and physical therapy.

Full extension at 0 degrees serves as the baseline position, while flexion up to approximately 135 degrees allows for activities such as running, jumping, and squatting, which require significant knee movement. It’s essential to recognize that this range can vary somewhat among individuals but the typical maximum flexion often cited is around 135 degrees.

Options that suggest narrower ranges, such as 110-120 degrees or 50-70 degrees, do not reflect the typical physiological capability of the knee joint and could indicate limitations or conditions that restrict normal motion. Similarly, the choice of 180 degrees is not possible since that would imply hyperextension far beyond normal anatomical limits. The flexibility of the knee joint is vital for various functional activities, making the correct answer the most accurate representation of its range of motion.