Between which bones are saddle joints typically found?

Saddle joints are a type of synovial joint where the opposing bone surfaces are shaped like a saddle, allowing for movement in multiple directions. This unique configuration is designed to support complex movements while providing stability.

The correct pair of bones that constitute a saddle joint is the metacarpal and trapezium. This joint is located at the base of the thumb and allows for the thumb's remarkable range of motion, including opposition (touching the thumb to the other fingers). The saddle shape accommodates movement along two axes, permitting flexion, extension, abduction, adduction, and circumduction, which is crucial for tasks that require fine motor skills.

In contrast, the other options represent different types of joints. For example, the connection between the femur and fibula is not a saddle joint but rather a hinge joint at the knee and the proximal tibiofibular joint, which allows for a more limited range of movement. The radius and ulna primarily form pivot and hinge joints, facilitating rotation and flexion. Lastly, the talus and calcaneus relate to the ankle joint's function, primarily exhibiting gliding motions rather than the range of motions provided by a saddle joint configuration.