“Why do results differ so much between patients with the same weight and body type?” — the answer often lies not in the surgery itself, but in the precision of the liposuction preoperative marking performed immediately before the operation. The three-dimensional contour of the body changes moment by moment with posture. When lying down versus standing, fat distribution, skin tension, and the visibility of skeletal lines are entirely different. In this column, Dr. Moriwaki explains the medical reasoning behind performing liposuction preoperative marking in the standing position, and what actually changes with posture.

Key Points of This Article

– Liposuction preoperative marking is performed in the standing position as the global standard

– Subcutaneous fat shifts under gravity, so supine (lying) marking cannot capture true contour lines

– Combining standing, sitting, and forward-bending positions is the key to accurate dynamic assessment

– Marking precision directly influences the risk of postoperative irregularity and asymmetry

– AVAN TOKYO combines multi-posture evaluation with photographic analysis for meticulous preoperative design

What Is Preoperative Marking?

Preoperative marking is the process of drawing directly onto the patient’s body — indicating the areas to be suctioned, the areas to be preserved, boundary lines, and the incision (port) sites — immediately before surgery. Using this map, the surgeon determines which layer of subcutaneous tissue to suction, in which direction, and to what extent. During surgery, tumescent fluid inflates the tissues by several centimeters, making volume judgment difficult. This is why the marking functions as both blueprint and compass.

Medical Reasons for Standing Liposuction Preoperative Marking

Why go to the trouble of marking a patient in the standing position? The answer is clear: subcutaneous fat is a tissue strongly influenced by gravity. The moment a patient lies supine, abdominal fat spreads to the sides, upper-arm fat drifts toward the shoulder, and thigh fat sags forward. Yet in daily life, a person is seen by others while standing or sitting — not while lying down. To match results to “real-life beauty,” fat distribution must be assessed in the standing position.

How Posture Changes the Appearance of Subcutaneous Fat

By changing posture, the outline of fat can shift dramatically even for the same patient.

– Standing: fat settles downward under gravity — the most natural distribution, matching the silhouette others see.

– Sitting: compressed bulges of the lower abdomen, posterior thigh, and flank become obvious.

– Forward bending: steps and bulges of the back, waist, and upper buttocks become visible, providing key landmarks for correction.

– Supine: fat disperses laterally and often appears smaller than reality — evaluating supine alone is risky.

Combining these positions allows the dynamic body line to be understood three-dimensionally, and “where NOT to suction” becomes clearer. Liposuction preoperative marking is often even more about designing what to leave behind than what to remove.

Why Marking Precision Determines the Final Result

Once tumescent fluid is infiltrated, the subcutaneous layer swells by several centimeters and boundary lines become harder to see with the naked eye. The patient’s posture may shift slightly under anesthesia. Suctioning by “feel alone” in this state easily leads to depth and boundary errors, which can cause irregularity, asymmetry, and over-suction. Marks drawn in the standing position beforehand serve as “anchors to return to,” minimizing intraoperative drift. For more on postoperative recovery, please see our liposuction column archive. Safety standards in aesthetic surgery are also outlined by the Japan Society of Aesthetic Surgery (JSAS).

AVAN TOKYO’s Commitment to Liposuction Preoperative Marking

At AVAN TOKYO, we do not merely draw a boundary line. We ask patients to assume standing, sitting, forward-bending, and backward-bending positions, evaluating how fat shifts in each. Photographs are taken from multiple angles, and skeletal landmarks — acromion, costal margin, anterior superior iliac spine, greater trochanter — are used as reference points. This meticulous attention is what allows a three-dimensional, natural result to be reproducible. That said, outcomes vary between individuals. Skin quality, thickness of the fat layer, and skeletal structure all define the indications and limits of surgery. Any clinic that overpromises beyond these realities should be regarded with caution.

Frequently Asked Questions

Q. How long does liposuction preoperative marking take?

It depends on the case, but at AVAN TOKYO we typically spend 10 to 30 minutes carefully performing the marking. Wider areas and revision cases may require additional time.

Q. Doesn’t the marking rub off?

We use a dedicated oil-based marker. Because disinfectant and intraoperative friction can fade the lines, marks are drawn deeply and reinforced with double lines or arrows at critical points.

Q. Can I check the markings myself?

Yes. We verify the lines together with the patient in front of a mirror before entering the operating room. This consent process is important for safety.

Q. Some clinics mark only in the supine position — is that acceptable?

Standing marking is the global standard both in Japan and abroad. Marking only supine ignores gravitational effects on fat distribution, which can reduce the reproducibility of results.

Q. Can the design be changed after marking?

Yes, but large last-minute changes are undesirable from an anesthesia and time-management standpoint. We progressively align design decisions during counseling so that only fine adjustments remain on the day of surgery.

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Supervising Physician: Shin Moriwaki, MD

Member, Japan Society of Aesthetic Surgery (JSAS)

Member, American Academy of Aesthetic Medicine

ECFMG Certificate (U.S. Medical Licensing Qualification)

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📍AVAN TOKYO GINZA LIPOSUCTION CLINIC

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