Hip Dip Fillers: Planning a Natural-Looking Result

The full text of my column in the May 2026 issue of D&PS.

How Are Hip Dips Treated?

A balanced gluteal silhouette depends on soft transitions at its upper and lower borders. An abrupt or angular junction between the waist and upper buttock, or between the infragluteal fold and thigh, can make a treated contour look artificial.

Added volume should blend with the existing tissue, without a firm ridge or isolated bulge. A gradual curve more closely follows natural anatomy and can remain proportionate as weight and age change.

Hip fillers provide a minimally invasive way to refine the buttocks and lateral hips. They can address anatomical contour variations and selected irregularities after other procedures without further surgery. One of the most common uses is correction of the depression over the greater trochanter, known as a hip dip.

A hip dip reflects the relationship between the ilium and greater trochanter, muscle attachments and fat distribution. Filling the depression can soften the interruption in the curve from waist to hip and outer thigh.

A second use is gluteal augmentation. When volume is naturally limited or has diminished with aging or weight loss, filler can add projection and a fuller contour. Carefully adjusted amounts can also improve differences in size or shape between the two sides, including subtle imbalances associated with pelvic rotation or overall body asymmetry.

Fillers may also refine postoperative contours. After fat grafting or implant surgery, they can address uneven borders, irregular fat distribution or localized volume loss. Targeted treatment of a depression aims to restore a smoother surface and silhouette.

Figure 1. Goals of aesthetic hip treatments.

Which Filler Properties Matter for Hip Dip Correction?

Hip dip correction and gluteal augmentation involve broad treatment areas exposed to pressure and movement. HA products with suitable viscosity and cohesivity are therefore often considered for structural support. Body-contouring formulations are designed with these demands in mind and share several relevant physical and chemical characteristics.

First, moderate to high viscosity and elasticity help the material retain its form and support volume during ongoing compression and movement.

Second, most use cross-linked HA from nonanimal sources, with favorable biocompatibility and a relatively low immunogenic potential. The material degrades gradually. The ability to dissolve HA with hyaluronidase is also relevant to managing certain complications.

Third, larger-particle, cohesive formulations can remain more localized within tissue, helping provide structural volume and allowing the clinician to shape the contour with greater control.

Product choice must match the area and purpose. A shallow depression near the surface may call for a softer formulation with finer particles. In thin subcutaneous tissue, an overly stiff or viscous product can become visible as irregularity or projection.

For deeper subcutaneous augmentation above the muscle fascia, stronger support and greater cohesivity may be useful. These properties help resist pressure, gravity and deformation, although the appropriate choice also depends on the product’s specific characteristics.

The principle is to match material properties to anatomy: softer products for subtle superficial blending and more supportive products for deeper volume. This helps improve precision and consistency while limiting visible or palpable irregularities.

What Can Hip Dip Fillers Change?

Planning Around Body Shape

Treatment goals should be individualized. In an A-shaped or pear-shaped body, the hips and thighs are fuller relative to the upper body. The focus may be on softening a hip dip and smoothing the transition into the outer thigh, rather than adding broad overall volume.

For a straighter, H-shaped silhouette, the goal may be a more defined waist-to-hip transition and added lateral volume. In a V-shaped silhouette, where the upper body is broader, increasing lower-body volume may create greater proportional balance.

Patients need a realistic understanding of their anatomy and the limits of treatment. Bone structure, skin elasticity and tissue thickness all influence the result. Goals should focus on an achievable change within that individual’s body shape. Fillers are not permanent surgery, and maintaining the effect may require further treatment.

Confidence and Body Image

For some patients, the purpose extends beyond a visible contour change. A smoother hip line may help them feel more comfortable in fitted clothing or swimwear and more satisfied with their appearance.

That improvement in body image can carry into everyday life, reducing avoidance of certain clothes or activities and helping a patient feel more at ease socially.

Hip dips are a normal anatomical variation, not a defect or a reason treatment is necessary. Many people are happy with their natural shape. Filler is an elective way to pursue a personal preference, and satisfaction is most likely when the decision and goals come from the patient.

Addressing Age-Related Contour Changes

Aging changes fat distribution, skin elasticity and muscle volume. Lateral hip tissue may diminish from the thirties onward, while later skin laxity can make a dip appear deeper. Appropriately placed volume can support the overlying tissue and partially restore an earlier contour.

Replacing lost volume may recreate a fuller curve that some patients associate with youth and vitality. Aesthetic and evolutionary-psychology literature has discussed these associations, although they are perceptions rather than measures of an individual’s health or reproductive capacity.

The broader goal is to balance proportions, smooth transitions and improve symmetry in a way that remains natural during movement. Aesthetic models such as the hourglass silhouette or golden ratio can inform discussion, but treatment should serve the patient’s own preferences and help them feel comfortable with the result.

Gluteal Anatomy Relevant to Filler Treatment

Safe treatment requires a detailed understanding of skin, subcutaneous tissue, muscles, major vessels and nerves. The thickness and position of these structures vary between individuals.

Gluteal fat is divided into superficial adipose tissue (SAT) and deep adipose tissue (DAT) by the superficial fascia. SAT contains densely packed small lobules, while DAT has more connective-tissue space between lobules and is relatively mobile.

Subcutaneous fat is usually thickest centrally and becomes thinner laterally. The superficial fascia is more distinct in the upper buttock and less clearly defined lower down.

These relationships guide plane selection and complication prevention. The deeper subcutaneous layer generally contains fewer major vessels than the muscle layer, but it is not avascular. Differences in compliance between the superficial and deep fat also affect how material should be distributed for a natural contour.

Figure 2. Fat layers of the hip and buttock.

The gluteal region includes the gluteus maximus, gluteus medius, gluteus minimus and deeper piriformis. The large, superficial gluteus maximus is a major determinant of buttock shape. The medius and minimus contribute to the lateral pelvic contour, while the deeper piriformis participates in external rotation of the femur.

Hip dip depth depends on the relationship between muscle and bone. A greater distance between the iliac crest and greater trochanter can accentuate the lateral depression. A prominent gluteus medius can also make the area below it look relatively hollow. Pelvic morphology and muscle mass vary between individuals and sexes. Understanding these relationships helps identify the contour deficit and the deeper structures to avoid.

Figure 3. Gluteal arterial anatomy.

How Are Injection Plane and Volume Chosen?

Treatment Plane and Volume

Plane selection is central to both safety and effect. The deep subcutaneous space above the muscle fascia is commonly used because it offers room for distribution while avoiding the larger neurovascular structures within and beneath muscle. The cannula tip must remain within the intended subcutaneous plane.

Excess material immediately beneath thin skin can create nodules or discoloration, although small superficial amounts may sometimes be used to blend an edge. The main volume is generally placed in the deeper subcutaneous layer above the fascia. Intramuscular injection must be avoided because of the risks of vascular or sciatic-nerve injury and unwanted material distribution. Cannula position requires repeated confirmation during treatment.

Volume depends on the depth of the depression and the intended change. Published examples include 5–10 mL per side for mild hip dips, totaling 10–20 mL; 10–20 mL per side for more pronounced depressions; and up to 30 mL per side in selected cases. Larger gluteal augmentation reports describe 50–100 mL per side, with totals up to 200 mL.

These are reported ranges, not fixed prescriptions. Anatomy and skin extensibility determine the plan. A staged approach over two or three sessions can allow gradual tissue accommodation and may reduce overfilling and irregular distribution.

Injection Techniques

A fanning technique distributes material along several radial tracks from one entry point. One published hip dip case used five 1 mL tracks on each side, totaling 10 mL, followed by the same amount two weeks later for a total of 20 mL. Linear retrograde placement distributes a continuous strand as the cannula is withdrawn. Cross-hatching uses intersecting tracks, but excessive overlap can cause pooling. Layering uses materials with different properties at different depths when broader volume correction is needed.

Whichever technique is selected, even distribution in thin layers is important. Depositing a large amount in one location can produce a lump, so controlled placement across several tracks is generally preferred.

What Precautions Matter in Gluteal Filler Treatment?

Cannula Angle and Direction

A shallow entry angle, approximately 30° in the technique described here, helps direct the cannula into the subcutaneous plane; a steep angle increases the risk of entering muscle. Controlled movement during placement limits focal pooling. Some clinicians use aspiration to check for blood return, but a negative result cannot reliably exclude intravascular placement, particularly with a side-port cannula. Slow delivery in small aliquots, for example 0.1–0.2 mL or less, is one precaution within a broader anatomical safety approach.

Placement along the direction of gluteal fibers and septa may reduce resistance and uneven distribution. An orange-peel surface appearance can indicate excessive superficial material. Depending on the product and clinical findings, redistribution or hyaluronidase may be considered by the treating clinician.

Figure 4. The sciatic nerve.

The superior and inferior gluteal arteries are the main arterial supply to this region. The superior gluteal artery arises from the posterior division of the internal iliac artery and leaves the pelvis through the greater sciatic foramen above piriformis. Its superficial branch supplies the deep surface of gluteus maximus, while its deep branch runs between gluteus medius and minimus. The inferior gluteal artery arises from the anterior division of the internal iliac artery, exits below piriformis and supplies the lower gluteal region and structures around the sciatic nerve.

Large vessels exceeding 2 mm are relatively uncommon in the subcutaneous gluteal layer, which is one reason this plane is favored over deeper placement. Risk is not eliminated. The superior gluteal artery’s deep branches and the inferior gluteal vessels near the sciatic nerve are particularly important when considering the consequences of unintended deep injection, including vascular injury or embolism.

Avoiding the Sciatic Nerve

The sciatic nerve is the largest nerve trunk in the body. It arises from the lumbosacral plexus, usually exits the greater sciatic foramen below piriformis and passes deep through the gluteal region before descending along the posterior thigh. It supplies much of the lower limb’s motor and sensory function. Direct injury or compression during injection can cause serious neurological complications.

For intramuscular gluteal injections, the upper outer quadrant has traditionally been chosen to remain away from the sciatic nerve. It lies superior and lateral to a line connecting the posterior superior iliac spine and greater trochanter. This anatomical relationship may also inform filler entry-point selection, but filler itself must remain outside muscle.

Studies have reported that the ventrogluteal site is farther from the sciatic nerve than the traditional dorsogluteal site: mean distances of 18 ± 3.5 cm and 9 ± 2.3 cm, respectively, have been cited. For hip filler treatment, lateral access and strict control of depth remain important; these measurements do not replace individual anatomical assessment.

What Can Collagen Stimulators Offer for Hip Contouring?

Maintaining Integrated Volume

PLLA-, CaHA- and PCL-based collagen stimulators promote new collagen and can improve volume and firmness. In the buttocks, where sitting and movement place pressure on the tissue, integration with surrounding tissue is important for maintaining shape.

Collagen induced by PLLA and PCL becomes part of the surrounding tissue network, helping support volume under pressure. With CaHA, the carrier gel provides an initial effect, followed by collagen remodeling. Reports describe appropriately diluted, evenly distributed CaHA remaining within the intended tissue plane with limited migration.

Correct placement is central to both the feel and stability of the result. Superficial pooling can create palpable nodules, so material must be distributed evenly in a suitable subcutaneous plane. PLLA, for example, is placed above the gluteal muscle. With appropriate technique, the resulting volume can retain a natural feel and elasticity during ordinary movement.

How Long Can Results Last?

CaHA-related volume effects are commonly described as lasting approximately 12–18 months, gradually diminishing as the particles degrade. Some newly formed collagen and elastin may remain beyond that period, so the tissue may not return immediately to its pretreatment appearance.

PLLA studies have reported effects lasting two years or longer. In a three-year follow-up study, significant volume improvement remained at 2.5 years in treated patients.

Some particulate PCL formulations have reported durations of three to four years, depending on the product. Gradual particle degradation and continued collagen stimulation can produce a slow decline in effect rather than an abrupt loss of volume.

For the formulations discussed here, reported duration generally follows PCL, then PLLA, then CaHA. Product selection should consider the patient’s goals, the particular formulation and whether a shorter or longer-lasting change is appropriate.

For broadly reduced volume, PLLA or PCL may be used in staged treatment of the upper and central buttock. Where weight loss has left laxity and reduced firmness, diluted CaHA protocols have been described across selected tissue planes to address skin quality and support as well as volume.

How Does the Plan Change with Buttock Shape?

One publication classified buttocks as round, square, A-shaped and other forms, with different treatment patterns for each. Upper-volume deficiency may call for emphasis on the upper central region, lateral hip dips for linear distribution along the side, and lower sagging for carefully planned upper support.

Planning requires assessment of elasticity, cellulite severity, shape, asymmetry and the patient’s priorities. These findings guide product concentration, volume and depth. The 3D Beautification protocol, for example, uses pretreatment assessment of shape, cellulite and skin quality to individualize dilution, tissue planes and injected volume.

Age and treatment area also influence the number of vials used; published protocols have reported an association between volume administered and skin improvement. Larger areas or greater laxity may require more product. Because PCL effects can be prolonged, a conservative, staged approach is generally favored over a large single-session correction.

(To be continued in the next issue)

Read the Print Edition