To fully appreciate why Venus dimples are fixed structural features, it is necessary to understand the role of fascia and ligaments in anchoring the skin to the skeletal framework, particularly in the lower back region.
The Role of the PSIS and Sacroiliac Joint
The PSIS is a landmark of the sacroiliac (SI) joint, a complex joint that connects the sacrum (at the base of the spine) with the ilium (the large, wing-shaped bone of the pelvis). This area is a crucial convergence point for load transfer between the torso and the legs.
- Ligamentous Density: The SI joint is supported by some of the strongest ligaments in the body (e.g., the sacroiliac ligaments). The specific short ligament responsible for the dimples often arises from this dense network, ensuring maximum stability in a high-stress area. The tightness and shortness of this specific dermal ligament dictate that even if the surrounding soft tissue (fat, superficial muscles) were to substantially increase, the skin will be forcefully pulled inward at that precise location. This explains why the dimples can still be faintly visible even on individuals with higher body fat percentages, provided the underlying ligament is short enough.
Fascia: The Connective Fabric
The structure of the dimples is also related to the body’s fascial system. Fascia is a web of connective tissue that surrounds and supports muscles, organs, and bones.
