In order to obtain an oblique position of the first digit (thumb), what surface of the hand should be in contact with the image receptor?

For achieving an oblique position of the first digit (thumb) in radiographic imaging, the palmar surface of the hand should be in contact with the image receptor. Positioning the thumb in this way allows for optimal visualization of the first digit’s anatomy, including the bony structures and joint spaces.

When the palmar surface is placed down, it facilitates the necessary angle for oblique projection, enabling important anatomical features, such as the metacarpal, proximal phalanx, and the interphalangeal joints, to be clearly seen. Additionally, this positioning helps reduce superimposition from adjacent fingers, providing a clearer image for assessment.

Other surfaces, such as the dorsal or lateral aspects of the hand, would not achieve the same degree of obliquity or may obscure critical anatomy, leading to less effective imaging. Therefore, positioning the thumb with the palmar surface in contact with the receptor is essential for obtaining a proper oblique view.