Cervical Fusion and Breast Implants: A Biomechanical Warning from Our New ASPS Publication

A patient with a decade-old cervical fusion developed disabling neck and upper-back pain within weeks of breast augmentation. Imaging was unchanged. Removing the implants resolved the symptoms and kept them resolved at one year. In a letter just published in Aesthetic Plastic Surgery (Springer Nature, 2026), Dr. Nihal Ustun and I propose a simple biomechanical explanation — and a practical rule for patient selection that every surgeon and every prospective augmentation patient should understand.

Why this case matters

The link between very large native breasts and neck, shoulder and back pain is well established. What is much less discussed is the mirror-image situation: a modest cosmetic implant, placed on a spine that has lost some of its ability to adapt, can produce the same pattern of pain — and it can appear years after any prior spinal surgery.

Our case was a 46-year-old woman with an anterior cervical discectomy and fusion (ACDF) at C4–C5 performed ten years earlier. She had been stable and asymptomatic. After mastopexy with bilateral 350-cc silicone implants, she developed:

• Progressive neck and upper back pain, 8/10 by end of day.
• Nocturnal awakening and disrupted sleep.
• No new imaging findings and no neurologic deficit.

Explant produced symptom relief within weeks, sustained at one year. The temporal relationship, the reversibility, and the absence of an alternative structural cause are what make this observation clinically meaningful.

The biomechanics, in plain terms

Any weight placed in front of the spine creates a forward-tipping (flexion) moment. Two numbers matter:

1. The force of the implant. A 350-cc silicone implant weighs about 0.35 kg, so gravity pulls on it with roughly 3–4 newtons. Bilaterally, that is around 6.8 N.
2. The lever arm. The implant sits 8–10 cm in front of the spinal axis. Multiplying force by distance gives a bending moment of roughly 0.6–0.7 newton-metres.

That is a small number in absolute terms. The problem is who has to pay for it. The posterior neck muscles that counter this moment have very short lever arms of their own, so the muscle force they must generate is disproportionately large — and it is generated continuously, all day, every day.

In a healthy, mobile spine the load is shared across many segments and posture adapts silently. In a fused spine, the segments above and below the fusion, and the paraspinal muscles, absorb what the fused segment can no longer share. Tolerance for any additional anterior load is reduced.

Why the pain looks the way it does

Because the mechanism is muscular overload, not nerve compression, the symptom pattern is characteristic:

• Pain that worsens through the day and is at its worst at night.
• Fatigue-type ache in the paraspinal and upper trapezius muscles rather than shooting or radicular pain.
• Relief when the load is removed — lying down, unhooking a heavy bra, or definitively, explantation.
• Normal repeat imaging, because there is nothing new to see structurally.

This pattern is easy to miss. Patients are often reassured that their scans are unchanged and sent away with analgesia; the mechanical relationship to the implant is not made.

What this changes for patient selection

This is a single-patient observation and it does not prove causation. But the biomechanics are coherent enough that we now treat prior cervical fusion — and by extension any condition that reduces spinal adaptability — as a susceptibility factor during augmentation planning. In practice this means:

1. Ask about spinal history explicitly. Prior ACDF, lumbar fusion, ankylosing spondylitis, severe scoliosis and long-standing chronic neck pain all deserve to be recorded before an implant is chosen.
2. Discuss implant mass, not just volume. Volume drives cosmetic result; mass and projection drive the anterior moment on the spine. Where spinal reserve is limited, the smallest volume and lowest projection that meets the aesthetic goal is the safer choice.
3. Consider the pocket. A well-supported dual-plane pocket that keeps the implant close to the chest wall reduces the lever arm compared with a projected sub-glandular placement.
4. Counsel differently. Patients with reduced spinal adaptability should be told, before surgery, that new or worsening neck/upper-back pain is a signal to return early — and that explant is a definitive, effective treatment if a mechanical intolerance develops.
5. Take explant seriously as a diagnostic and therapeutic option. When imaging is normal, symptoms are fatigue-dominant and temporally linked to augmentation, removing the load is both the test and the treatment.

A note for patients

If you are considering breast augmentation and you have had spinal surgery, chronic neck pain, or a diagnosed spinal condition, this is a conversation to have with your surgeon at the first consultation — not after the operation. In our clinic it now forms a standard part of the pre-operative assessment for augmentation. The right implant on the right patient is safe; the wrong implant on a spine that cannot adapt is a problem that is entirely avoidable.

Reference

Ustun N, Karaaltın MV. Implant-Associated Anterior Loading and Spinal Intolerance After Cervical Fusion: A Biomechanical Perspective. Aesthetic Plastic Surgery. Published online 18 June 2026. Springer Nature / International Society of Aesthetic Plastic Surgery.