Collarbone Aesthetics: Can Treatment Refine the Clavicle Line?
The full text of my column in the June 2026 issue of D&PS.
Clavicular aesthetics involves much more than making a bone more prominent. The neck, shoulders and upper chest need to be assessed as one region. Skeletal anatomy, the upper trapezius and deltoid, subcutaneous fat, skin laxity, scars and posture all contribute to the visible contour.
The subclavian vessels, brachial plexus and pleural dome lie beneath or behind the clavicle, while supraclavicular nerve branches cross superficially along variable paths. Treatment planning must begin with the recognition that thin surface tissues overlie important deeper structures.
How Is a Clavicle Treatment Chosen?
A 2025 single-case report in Aesthetic Plastic Surgery described ultrasound-confirmed subperiosteal filler placement as a way to stabilize clavicular contour. A 2026 JPRAS Open report of a six-point technique used 2.0 mL per side in a 35-year-old woman, with immediate improvement, high satisfaction at three months and no serious complications. Subperiosteal HA augmentation is therefore one of the more directly documented nonsurgical approaches, although the evidence remains limited to case reports.
When upper trapezius hypertrophy obscures an otherwise adequate clavicle, botulinum toxin type A may be more appropriate. A 2025 systematic review of nine studies and 121 cases reported aesthetic improvement with 20–50 U per side, generally lasting four to five months. Adverse effects were mainly temporary weakness and discomfort; no serious long-term complications were reported. In these patients, reducing overlying muscle bulk may reveal the existing clavicle without adding volume.
When fat is the main contributor, the plan changes. The FDA indication for deoxycholic acid is submental fat; safety and effectiveness in other areas have not been established. Routine use in thin tissue directly above the clavicle therefore requires caution. Broader, pinchable deposits in the supraclavicular region, axillary roll or bra line may be better suited to conservative liposuction or an appropriate energy-based approach. Evidence supports HIFU, RF and cryolipolysis in body contouring generally, but high-quality data for the clavicular crest itself are sparse.
Surgical options can be considered in terms of adding or removing volume. Fat grafting or limited scar revision may help selected cases of poor skeletal definition, post-traumatic depression, thin-tissue irregularity or scar tethering. Conservative liposuction may be appropriate for surrounding fullness. Cosmetic clavicle implants are difficult to recommend routinely: tissue coverage is thin, palpability, infection and extrusion are concerns, and there is little supporting evidence. Most implant literature concerns trauma or reconstruction.
A more prominent collarbone is not necessarily a better aesthetic result. Excessive prominence can suggest wasting, aging or recent illness, while some patients benefit more from improved symmetry or balanced trapezius volume. Publication of photographs or cases also requires proper consent and anonymization whenever identification is possible; masking the eyes alone may be insufficient.
Figure 1. Planned injection sites and volume allocation for minimally invasive HA augmentation of the clavicular line: approximately 0.5 mL at concavities and 0.3 mL along projecting curves.
How Do Anatomy and Posture Affect the Clavicle Line?
The clavicle acts as a strut between the sternoclavicular and acromioclavicular joints, holding the upper limb away from the axial skeleton and enabling shoulder-girdle motion. Scapulothoracic, AC and SC movement work together during elevation and rotation. Assessment should therefore include neutral standing, slight shoulder depression and active elevation, rather than a single static photograph.
From superficial to deep, the region includes skin, superficial fascia and platysmal continuity, subcutaneous fat and veins, supraclavicular nerves, the deeper cervical and clavipectoral fascia with subclavius, periosteum and bone. The subclavian vessels and brachial plexus lie inferiorly and posteriorly, and the pleural dome may extend relatively high. Direction and depth control are essential for any injection or suction procedure. AO Surgery Reference highlights neurovascular vulnerability near the junction of the medial and middle thirds; CT morphometric studies also demonstrate variation in the costoclavicular space.
Posture changes the appearance continuously. Upper trapezius hypertonicity can make the neck-to-shoulder transition look short and crowded, obscuring the clavicle. Excessive shoulder depression or marked weight loss can exaggerate bony prominence. Assessment should therefore include posture, trapezius bulk, deltoid contour and supraclavicular hollow depth together.
| Assessment | Clinical Findings | Potential Approach | Evidence Level |
|---|---|---|---|
| Limited skeletal definition | Limited or interrupted clavicular definition, little overlying fat, and a depression or asymmetry centered on the bony contour | Subperiosteal HA filler; selected cases of fat grafting | Case reports and expert opinion |
| Clavicle obscured by trapezius bulk | Upper trapezius bulk shortens the apparent neckline and obscures the clavicle | BoNT-A with posture or rehabilitation work | Systematic review and anatomical studies |
| Excess soft tissue | Supraclavicular, axillary or bra-line fullness; pinchable fat | Liposuction first; selected small fat pockets may warrant discussion of off-label DCA | Reviews, guidance and expert extrapolation |
| Skin laxity or crepey texture | The clavicle is visible, but skin laxity or texture is the main concern | RF, HIFU, fractional laser or a scar-treatment protocol | Systematic and narrative reviews |
| Contour change after trauma or surgery | Fracture malunion, fixation-plate scars, tethering or a focal depression | Joint orthopedic and plastic-surgery assessment; scar revision with or without fat grafting | Anatomical and trauma literature; fat-grafting reviews |
| Findings requiring medical assessment | Pain, tenderness, neurological or vascular symptoms, or shortness of breath | Orthopedic, thoracic or neurological assessment before cosmetic treatment | Authoritative anatomical and trauma references |
Table 1. Cause-based assessment and treatment planning in clavicular aesthetics.
How Is a Natural-Looking Clavicle Line Assessed?
There is no established clavicle aesthetic score. In practice, I assess five areas: continuity and symmetry of the clavicular line; depth and balance of the supraclavicular hollows; upper trapezius prominence and apparent neck length; surrounding fat and skin quality; and orthopedic history, including fracture, malunion, hardware, scars or thoracic outlet symptoms. The first task is to distinguish limited skeletal definition from soft-tissue coverage or muscle dominance.
In Korea and some other Asian settings, patients often seek a slender neckline, restrained trapezius prominence and a visible clavicle. These are not universal goals. A patient seeking a more masculine upper-body contour may prefer deltoid and pectoral definition without exaggerated collarbones; a feminizing goal may place more emphasis on apparent neck length and reduced shoulder breadth. A male upper-body HA contouring case showed that filler could enhance muscle definition even at a higher BMI, while also emphasizing that filler does not replace fat reduction.
The most direct clavicle-specific reports concern subperiosteal HA augmentation. Chang and Zhao described limited subperiosteal dissection using a needle and cannula, with ultrasound confirmation that the filler remained beneath the periosteum. They reported a stable result at six months.
The JPRAS Open six-point report treated a 35-year-old woman with 2.0 mL per side, allocating 0.5 mL to concavities and 0.3 mL to curved highlight areas. Improvement was immediate, satisfaction was 9/10 at three months, and no serious adverse event was reported. These remain case-level data, but they offer a consistent rationale for the chosen plane.
Potential candidates include patients with thin to moderate soft-tissue coverage and true bony underdefinition, an apparent interruption in the clavicular line, mild asymmetry or a post-traumatic depression. A high BMI or pronounced supraclavicular fullness may continue to obscure the line despite added structural volume. As the male upper-body contouring report noted, filler cannot substitute for fat reduction.
How Is Treatment Planned?
The published approach begins with standing assessment and marking of the crest, concavities, visible veins, asymmetry and shoulder posture. After asepsis and appropriate anesthesia, placement is planned in relation to the bone while avoiding an inferior-posterior trajectory. Small amounts are distributed across selected points, with ultrasound used where available to confirm the plane and spread. Vascular compromise, disproportionate pain or rapidly expanding swelling must be checked immediately. Conservative initial augmentation followed by staged refinement is preferable to simply increasing a published dose.
Filler rheology matters because body applications face greater mechanical stress than fine facial lines. Higher G′, complex modulus and resilience may be useful, but these measurements alone do not determine success. Thin coverage increases the risk of palpable material and visible edges. Product stiffness must be balanced against plane, volume and tissue thickness.
When upper trapezius hypertrophy is the main reason the clavicle is obscured, BoNT-A may be more efficient than filler. A 2025 systematic review of nine studies and 121 cases reported some shoulder-contour improvement in all cases, typically lasting four to five months with 20–50 U per side. Mild temporary weakness occurred in 10.7%. This is best understood as revealing the clavicle by reducing muscle bulk.
Accurate injection mapping is important. Ultrasound and Sihler-staining studies show that regions rich in intramuscular nerve branches do not necessarily coincide with the main accessory-nerve branch. One study proposed the horizontal 1/5–2/5 and vertical 2/4–4/4 regions within its anatomical mapping system. Ultrasound can improve confirmation of the target muscle and depth compared with landmark-only injection. Clinical assessment includes active shrugging to identify the hypertrophic band and distributing treatment within the relevant muscle belly.
A conservative first dose is prudent, especially in smaller patients, athletes, people who frequently perform overhead exercise, or those with shoulder instability. Reassessment at two to four weeks allows evaluation of symmetry and shoulder position before any additional treatment. Patients should understand both the possible aesthetic changes and temporary heaviness, shrug weakness or exercise discomfort.
The evidence for deoxycholic acid must be kept in context. A meta-analysis of five randomized trials concerned submental fat, not the clavicle. Routine first-line use over the clavicular crest or thin supraclavicular tissue therefore requires a conservative approach to both evidence and regulatory status.
How Should Volume Reduction and Contour Refinement Be Balanced?
Injection adipolysis may be discussed only for a small, clearly subcutaneous, pinchable fat pocket when the patient does not want surgery and understands the off-label use. Reviews of serious adverse events emphasize the importance of anatomy, mapping, depth control and counseling about postoperative swelling. Before considering it, the clinician should determine whether the fullness belongs to the neck and chin region or is part of broader upper-trunk and axillary fat.
Energy-based devices may help, but most supporting evidence is indirect. A 2025 systematic review supported HIFU for general skin tightening and body contouring, while a 2024 review discussed RF at different dermal and subcutaneous depths. Because coverage over the clavicle is thin, these devices are more logically used as adjuncts for surrounding areas (the lower neck, décolletage, upper arms, bra line, axillary fullness or crepey skin) than for aggressive treatment directly over the bone.
Cryolipolysis, laser lipolysis and ESWT also appear in the body-contouring literature, but clavicle-specific protocols remain limited. Their role is to address surrounding soft tissue. Excess treatment directly over an already prominent clavicle in a thin patient can worsen a skeletal appearance.
Surgical volume reduction should focus on surrounding fullness rather than aggressive suction immediately over the clavicle. Assessment may include supraclavicular pads, axillary rolls, upper arms and the bra line. Reviews of arm contouring distinguish liposuction from brachioplasty according to fat distribution and skin laxity. Korean surgical guides likewise treat the chin and neck, arms, and back or bra line as separate regions with different costs and recovery patterns. Reducing peripheral fullness with gradual central blending can reveal the clavicle more naturally.
Published techniques include standing markings, tumescent infiltration, small cannulas, cross-tunneling and feathering. Suction near the crest must be conservative because skin coverage is thin and sensory nerves cross the area. The continuity from the lateral neck through the supraclavicular pad to the axillary roll is more useful to assess than an isolated spot. Poor skin recoil may warrant an appropriate tightening adjunct to limit contour collapse.
Surgical volume addition is most relevant to a focal depression or tethering after trauma or open reduction and internal fixation (ORIF), or to an excessively skeletal clavicle line. Fat-grafting reviews support gentle handling, suitable harvest and injection cannulas, dispersed small deposits and avoidance of pooling. In this thinly covered region, small parcels, careful plane selection and conservative correction are particularly important.
Direct cosmetic evidence for clavicle fat grafting is sparse, so much of the rationale is extrapolated from other regions. Consultation should address variable resorption, oil cysts, calcification and contour irregularity. Its clearest role may be in selected asymmetry or scar-tethering cases rather than routine augmentation.
(To be continued in the next issue)
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