Written by: Ellie Pranckevicius, FNP-BC, Aesthetic Nurse Practitioner & Aesthetic Injector | Facial Restoration & Regenerative Injectable Specialist, Mirror Plastic Surgery
Key Takeaways
- Hip dips are a normal anatomical feature created by the structural gap between the iliac crest and the greater trochanter of the femur. Visibility depends on skeletal geometry and soft-tissue distribution rather than fitness or body weight.
- Pelvic width and shape come from genetic inheritance and estrogen-driven hormonal changes across the lifespan. Lifestyle changes cannot alter these structural factors.
- Exercise can improve gluteal shape and strength but cannot move bone or erase the trochanteric depression. In some people, glute medius growth can make the indentation more visible.
- Biostimulatory fillers, specifically Radiesse and AlloClae, are the only evidence-based, non-surgical method for restoring lateral hip volume and improving contour symmetry.1
- Schedule your personalized consultation at Mirror Plastic Surgery for an individualized anatomical evaluation and unbiased product selection within a safety-first framework.
Skeletal Anatomy Behind Hip Dips: The Ilium–Femur Gap
Hip dips, formally termed the trochanteric depression, form at the junction between the iliac crest of the ilium and the greater trochanter of the proximal femur, a zone where no underlying bone or muscle fills the lateral contour. Three bony landmarks define the overall hip silhouette:
- Iliac crest: the superior, wing-shaped rim of the ilium that forms the uppermost boundary of the pelvis
- Acetabulum: the hip socket, which anchors the femoral head and determines the medial-lateral position of the entire femur
- Greater trochanter: the lateral bony prominence at the proximal femur, which sits inferior and lateral to the iliac crest
The upper femur is shaped like a curving number seven, with the greater trochanter projecting laterally away from the pelvis. The structural gap between the iliac crest above and the greater trochanter below is the anatomical origin of the hip dip. The depth of that gap scales with two measurable variables: the horizontal distance between the iliac crest and the greater trochanter, and the thickness of overlying subcutaneous fat.
A wider pelvis combined with thinner soft tissue produces a more visible indentation. The gynecoid pelvis, which is wider across the superior inlet, increases the visual distance between those two landmarks. This pattern explains why hip dips are more prevalent and more pronounced in women.
The depth and visibility of hip dips are determined by the position of the ilium relative to the femur and by how the gluteal muscles attach to those bones. Both factors are fixed structural features present from birth.
How Genetics and Hormones Shape Pelvic Width
Pelvic morphology reflects the interaction of genetic inheritance and hormonal signaling across the lifespan. A University of Zurich study using CT data from birth to old age found that male and female pelves are similar in width until puberty. The female pelvis then widens under hormonal influence.
The lead researcher concluded that the female body can modulate pelvic dimensions on demand rather than following a strictly fixed developmental program. This hormonal widening sets the stage for the skeletal contrast that makes hip dips more visible in many women.
Twin studies estimate that fat-distribution patterns are 30% to 60% genetically determined, with heritability around 50% in women. This genetic variability in soft-tissue distribution helps explain why hip-dip visibility differs so much between people at similar body-fat percentages.
By the end of puberty the female pelvis is wider than the male pelvis. This inherited skeletal contrast directly affects hip-dip visibility regardless of later fat or muscle changes.
A 2025 study in Science used deep learning on more than 30,000 dual-energy X-ray images to extract seven image-derived pelvic phenotypes. The researchers confirmed a hereditary component to pelvic size and shape in the largest genomic study of pelvic proportions to date.
Researchers have also identified specific gene variants that influence central versus peripheral fat patterns. These variants interact with estrogen levels, so the same variant can produce different hip-contour outcomes depending on an individual’s hormonal environment.
Fat Distribution, Glute Muscles, and Hip Dip Depth
Subcutaneous fat and gluteal muscle volume change how deep the trochanteric depression looks without changing its skeletal origin. People with more subcutaneous fat in the lateral hip region or greater gluteal muscle volume may have less visible hip dips because the tissue fills the surrounding contour.
Conversely, weight loss can make hip dips appear more noticeable because reduced soft tissue coverage reveals the underlying anatomical contours more clearly. The bone structure stays the same while the overlying padding changes.
The gluteus medius is butterfly-shaped, fanning outward from the iliac crest and inserting along the lateral surface of the greater trochanter. When this muscle is well developed and body fat in the area is low, its contour, including the natural depression between upper and lower glute, can become more pronounced.
The gluteus maximus contributes to rear projection and can soften visual contrast. Neither muscle group, however, fills the lateral gap created by the ilium–femur relationship.
Why Exercise Cannot Close a Bone-Defined Gap
Many people describe months of targeted glute work with no change in their hip dips. The underlying anatomy explains this experience.
Professor of Anatomy Adam Taylor has explained that hip dips are a feature of your skeleton and that exercise cannot move your bones. Because the gap is skeletal in origin, no amount of targeted exercise can close it.
There is also a counterintuitive risk. Building muscle in the gluteus medius while reducing body fat can make the underlying bones and muscles more prominent, which may increase the visibility of hip dips rather than reduce them. In addition, overloading the gluteus medius through repetitive exercise is a leading cause of microtrauma that can trigger greater trochanteric pain syndrome, a condition up to four times more common in women that affects up to a quarter of the population.
A review of studies confirmed that spot reduction does not work, so exercise cannot selectively reduce fat in the hip-dip area. Exercise remains valuable for strength, stability, and overall health, but it does not close a gap defined by bone.
Non-Surgical Hip Dip Correction With Biostimulatory Fillers
When skeletal anatomy creates a lateral indentation that soft tissue cannot adequately fill, targeted volume restoration with biostimulatory fillers offers a non-surgical, evidence-based way to improve symmetry and contour.
Mirror Plastic Surgery uses two agents for this indication:
- Radiesse: a calcium hydroxylapatite (CaHA) filler that provides immediate volumetric correction while stimulating the body’s own collagen production. Results continue to develop over weeks as neocollagenesis progresses, creating a gradual, natural-looking improvement in lateral hip contour.1
- AlloClae: a regenerative injectable with allograft-derived biostimulatory properties that restores volume and improves tissue quality in the gluteal and hip region.1 AlloClae suits patients who want structural correction with a regenerative medicine approach.
Both agents restore volume in the trochanteric depression, the precise anatomical zone where skeletal geometry creates the indentation. They do not attempt to alter the underlying bone or muscle architecture. The result is a smoother lateral silhouette that respects the patient’s natural proportions.1
Mirror Plastic Surgery’s Concierge Assessment for Hip Dips
Ellie Pranckevicius, FNP-BC, leads non-surgical body contouring at Mirror Plastic Surgery. Her background includes a Bachelor’s in Health Science from Boston University, 600 hours of hands-on esthetics training, a Master’s in Nursing from the University of South Florida, and four years in the Neuroscience ICU at Tampa General Hospital.
This clinical foundation, combined with specialized expertise in biostimulatory fillers for non-surgical BBL and hip dip correction, supports assessments grounded in both surface and subdermal anatomy. Every plan starts with a detailed look at how bone, fat, and muscle interact in the individual patient.
The Mirror Plastic Surgery consultation process for hip dip correction includes:
- Top-to-bottom anatomical evaluation: up to one hour dedicated to understanding skeletal proportions, soft-tissue distribution, and the specific geometry of the trochanteric depression.
- Goal clarification: open dialogue about desired outcomes, such as subtle softening, meaningful volume restoration, or symmetry correction, without pressure toward any particular product or volume.
- Unbiased product selection: a supplier-neutral approach where Radiesse or AlloClae is recommended based on individual anatomy and goals, not on commission or quota.
- Safety-first hierarchy: safety is evaluated before function, and function before aesthetics, guiding every treatment decision.
- Honest expectation-setting: clear guidance when a procedure is not yet indicated, building trust that supports long-term care rather than one-off treatments.
This concierge model contrasts with high-volume clinics where consultations are brief and product selection may be driven by inventory rather than individual anatomy.
Who Benefits Most: Candidacy, Timelines, and Maintenance
Ideal candidates for biostimulatory filler hip dip correction generally share several features:
- Visible trochanteric depression that persists regardless of fitness level or body composition
- Realistic expectations that focus on softening and contouring rather than erasing the underlying skeletal anatomy
- Stable body weight, since large weight changes after treatment can alter results
- No active infection, autoimmune condition, or contraindication to injectable treatment in the target area
Biostimulatory fillers follow a timeline that reflects their mechanism of action. Immediate volumetric improvement appears at the time of treatment.1 Collagen stimulation then refines results over the following weeks to months.
Maintenance intervals vary with individual metabolism, product choice, and the degree of correction. Ellie establishes a personalized maintenance cadence during the initial consultation, framing treatment as a long-term investment in contour rather than a single-session fix.
Planning Around Anatomical Variability
No two patients share identical ilium–femur geometry, soft-tissue distribution, or aesthetic goals. Genetics influence skeletal proportions, muscle shape, and body composition, which is why hip shape varies greatly among people even with similar body weight and fitness levels.
Treatment volume, injection depth, and product selection must be calibrated to each person’s specific anatomy. Standardized protocols applied without individualized assessment increase the risk of asymmetry or disproportionate results. Mirror Plastic Surgery’s hour-long evaluation is designed to prevent these outcomes.
Frequently Asked Questions
Are hip dips a sign of being overweight or out of shape?
Hip dips reflect skeletal anatomy, not poor fitness. They result from the structural relationship between the iliac crest and the greater trochanter of the femur, a geometry present at every body weight and fitness level.
Professional athletes and fitness models frequently have prominent hip dips. The visibility of the indentation depends on how much subcutaneous fat and muscle tissue overlies the area, but the underlying skeletal gap exists in everyone.
Can targeted glute exercises reduce the appearance of hip dips over time?
Exercise can improve overall gluteal shape, strength, and projection, yet it cannot alter the skeletal geometry that creates the trochanteric depression. Building the gluteus medius adds volume above the greater trochanter and may modestly soften visual contrast in some individuals.
In people with lower body fat levels, increased gluteus medius development can actually make the indentation more visible by sharpening the muscle’s contour. No exercise changes the distance between the iliac crest and the greater trochanter, which remains the primary structural determinant of hip dip depth.
What is the difference between Radiesse and AlloClae for hip dip correction?
Both products are biostimulatory agents that provide immediate volume while stimulating the body’s own collagen production over time. Radiesse is a calcium hydroxylapatite filler with an established track record in body contouring and delivers structural support with progressive collagen stimulation.
AlloClae is an allograft-derived regenerative injectable that emphasizes tissue quality improvement alongside volume restoration. The appropriate choice depends on individual anatomy, the degree of correction needed, and overall goals, which Ellie determines during a comprehensive consultation.
How long do results from biostimulatory filler hip dip correction last?
Longevity varies with individual metabolism, the product used, treatment volume, and lifestyle factors. Because biostimulatory fillers work partly by stimulating collagen, results develop gradually and can persist longer than traditional volumetric fillers alone.1
Most patients benefit from a maintenance plan that Ellie establishes during the initial consultation. This plan treats correction as an ongoing investment in contour symmetry rather than a one-time procedure.
Is non-surgical hip dip correction safe?
When a qualified injector with deep anatomical knowledge selects appropriate products, biostimulatory filler correction of the trochanteric depression has a well-characterized safety profile. At Mirror Plastic Surgery, safety is evaluated before function and aesthetics in every treatment decision.
Ellie’s background in critical care nursing and advanced injectable training, combined with Dr. Akash Chandawarkar’s surgical oversight, supports proactive prevention and management of complications through rigorous pre-treatment assessment.
Summary: Evidence-Based Options for Hip Dip Concerns
- Hip dips arise from a fixed skeletal gap between the iliac crest and greater trochanter, with visibility shaped by genetics, hormones, fat distribution, and muscle volume.
- Exercise supports strength and shape but cannot change bone geometry or selectively remove fat from the hip-dip area.
- Biostimulatory fillers such as Radiesse and AlloClae can restore volume in the trochanteric depression and improve contour when applied with an individualized, anatomy-first plan.1
- Mirror Plastic Surgery’s concierge assessment model, led by Ellie Pranckevicius, focuses on safety, honest expectations, and tailored product selection.
Disclaimer: Results may vary from person to person. Editorial content, before and after images, and patient testimonials do not constitute a guarantee of specific results.
1 Results may vary from person to person. Editorial content, before and after images, and patient testimonials do not constitute a guarantee of specific results.
