Hawaii Massage License Practice Exam

Which of the following is an example of a hinge joint?

1. Ankle

2. Shoulder

3. Knee

4. Wrist

The correct answer is: Knee

A hinge joint is characterized by its ability to flex and extend in one direction, much like the hinge of a door. This type of joint allows for movement primarily in one plane, which is essential for activities such as walking, squatting, and jumping. The knee is an excellent example of a hinge joint as it allows the lower leg to bend (flex) and straighten (extend) in a single plane. In contrast, other joints listed in the question allow for more complex movements. The ankle, for instance, is classified as a talocrural joint and does permit some hinge-like movement but includes additional motions such as inversion and eversion. The shoulder is a ball-and-socket joint, allowing for a wide range of motion in multiple directions. The wrist comprises several types of joints that permit complex movements, including flexion, extension, and rotational movements. Therefore, the knee is specifically identified as a hinge joint due to its primary movement in one direction, differentiating it from the other options listed.