The human forearm is capable of remarkable rotational movement, allowing the hand to turn palm-up (supination) or palm-down (pronation). This rotation is essential for many daily activities such as turning a doorknob, using tools, typing, or lifting various objects. These movements rely on the coordinated action of the radius and ulna bones, as well as the muscles and tendons that control them. One key structure involved in this motion is the biceps muscle, which plays a central role in both elbow flexion and forearm supination. The tendon attaches to a bony prominence on the radius called the radial tuberosity. As the forearm rotates, the tendon must pass through the narrow space between the radius and ulna. Anatomical studies have shown that this space, known as the radio- ulnar interval, becomes significantly narrower during rotation. If the tendon is compressed or is pinched in this space it can lead to pain, restricted movement, or even tendon damage. This condition is called impingement, referring to the abnormal contact or pressure between anatomical structures that limits motion or causes irritation. This thesis investigated whether the shape and orientation of the radial head could predict the position of the narrowest radio-ulnar distance at the level of the tuberosity. The radial head, located at the top of the radius bone, can be either circular or oval in shape. When it is oval, it has a distinct long axis and short axis, which allows researchers to define its orientation in space. This anatomical variation may influence how the radius moves relative to the ulna during forearm rotation. Using three-dimensional reconstructions of cadaveric CT scans, the study simulated forearm rotation and measured the radio-ulnar distance throughout the full range of motion. The radio-ulnar distance refers to the shortest measurable space between the radius and the ulna, particularly at the level of the radial tuberosity where the biceps tendon inserts. Although no consistent correlation was found between the orientation of the radial head and the narrowest radio-ulnar spacing, the study highlights the anatomical variability of the proximal forearm and the limitations of using single landmarks for surgical planning.