National Physical Therapy Examination (NPTE) Practice Exam

Which of the following joint categories best describes the classification of the intermetatarsal joint?

1. Planar

2. Spheroid

3. Trochoid

4. Saddle

The correct answer is: Planar

The intermetatarsal joints are primarily classified as planar (or gliding) joints. This classification is due to their structural characteristics, which allow for limited motion between the bone surfaces. In the case of the intermetatarsal joints, the articulating surfaces of the metatarsals are relatively flat, permitting a gliding motion that enables slight movement when the foot performs activities like walking and running. Planar joints typically facilitate movement in multiple directions, but this movement is primarily translational rather than rotational. This aligns with the function and anatomy of the intermetatarsal joints, which support the stability and mobility of the foot. Other types of joints, such as spheroid, trochoid, and saddle joints, have distinct characteristics that do not accurately describe the intermetatarsal joints. For instance, spheroid joints (like the shoulder) allow for a wide range of motion in multiple axes, while saddle joints (like the thumb) facilitate motion in two planes, and trochoid joints (like the atlas and axis in the neck) enable rotation around a single axis. None of these characteristics are representative of the intermetatarsal joints, reinforcing why the planar classification is the most appropriate.