Name the skeletal joint which permits movement in one direction only.

Explanation

**Step-by-Step Solution:**

1. **Identify the Type of Joint**: The question asks for a skeletal joint that allows movement in only one direction.

2. **Define the Hinge Joint**: The joint that fits this description is called a "hinge joint."

3. **Explain the Functionality**: Hinge joints allow movement similar to the opening and closing of a door. They permit flexion and extension movements along a single axis.

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