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Comparative Study of Anatomical Surface Landmarks in Supine and Prone Positions

Abstract

The study examines the anatomical surface landmarks observed in supine and prone positions, with emphasis on positional changes in the location, prominence, and relative relationships of selected external anatomical landmarks. Surface landmarks provide important reference points for identifying underlying anatomical structures and are widely used in physical examination, clinical procedures, anatomical education, and practical assessment. Differences in body position may influence the visibility and relative position of these landmarks, making comparative evaluation important for understanding their practical anatomical significance. The study will identify selected anatomical surface landmarks that can be assessed in both supine and prone positions and compare their characteristics under the two conditions. Selected bony prominences and palpable anatomical structures of the trunk and limbs will be examined using standardized observation and palpation procedures. Measurements of landmark position, prominence, or relative distances from established anatomical reference points will be obtained where applicable to provide objective information for comparison. A comparative descriptive research design will be adopted for the study. An appropriate sample of healthy young adults will be selected using a suitable sampling technique. Each participant will be examined in both supine and prone positions under standardized conditions, and selected surface landmarks will be identified, marked, and measured where appropriate. The data obtained will be analyzed using descriptive statistics such as frequency, percentage, mean, and standard deviation, while appropriate inferential statistical tests will be applied to determine significant differences between the two positions. The study is expected to reveal differences in the position, prominence, or relative relationships of some anatomical surface landmarks between supine and prone positions. Certain landmarks may remain relatively stable, while others may demonstrate noticeable changes due to differences in body contact with the supporting surface, soft-tissue displacement, muscle relaxation, and changes in body alignment. The magnitude of these variations is expected to differ according to the anatomical region and characteristics of the individual landmarks. The findings will be useful to anatomists, physiotherapists, radiographers, clinicians, medical educators, and other healthcare professionals who rely on surface landmarks for anatomical orientation and clinical assessment. The study may also assist students in understanding how body position influences the identification and interpretation of external anatomical landmarks during practical anatomy sessions. In addition, the findings may provide useful reference information for procedures that require accurate localization of surface anatomical structures in different body positions. The study will conclude by documenting the comparative characteristics of selected anatomical surface landmarks in supine and prone positions. It is recommended that body position be considered when identifying and assessing surface anatomical landmarks, particularly where positional changes may affect their visibility or relative location. Further studies involving larger and more diverse populations and additional anatomical regions are recommended to provide broader reference information on positional variations in surface anatomy.

Keywords: Anatomical surface landmarks, supine position, prone position, surface anatomy, anatomical landmarks, positional variation, body position, palpation, anatomical orientation, external landmarks, functional anatomy, clinical anatomy, young adults, anatomical assessment, practical anatomy.