Scoliosis in Duchenne Muscular Dystrophy

Scoliosis is one of the more visible orthopedic changes in Duchenne muscular dystrophy, and one of the most consequential. A curve that progresses unchecked can interfere with sitting tolerance, breathing, pain, and quality of life. Modern care has changed both the trajectory of scoliosis in DMD and the role of surgery, but the decisions remain individualized.

This post explains why scoliosis develops in DMD, what surveillance looks like, and how families and clinicians weigh surgical options.

Why scoliosis develops in DMD

As paraspinal muscles weaken, the spine loses the active stabilization that keeps it aligned during sitting. Over time, gravity, asymmetric muscle tone, and pelvic obliquity work together to bend the spine, usually after a child has transitioned out of ambulation.

The shift from walking to seated mobility is the period when curves most often appear and progress. Corticosteroids, now standard in many regions, have changed this picture significantly: when started early and continued, they appear to slow the development and progression of scoliosis in many patients.

The 2018 international care considerations include orthopedic surveillance as a core part of DMD care. (Birnkrant et al., Lancet Neurology 2018, Part 1)

Surveillance: clinic exam and imaging

Routine spine assessment is built into DMD clinic visits. Components typically include:

• Visual and palpation exam of the back, looking for shoulder asymmetry, rib prominence, and pelvic tilt.
• Sitting balance assessment as the child uses a wheelchair.
• Standing (when still ambulatory) or sitting posteroanterior spine X-rays at intervals, with measurement of the Cobb angle.
• Pulmonary function trends, since scoliosis and respiratory decline can interact.

The Cobb angle is the standard way of describing curve severity. Numbers below 20 degrees are often watched; numbers above 20 degrees, especially in a growing prepubertal patient who is not yet on long-term corticosteroids, push the conversation toward intervention. (Current Concepts in the Orthopaedic Management of DMD, PMC)

Bracing and wheelchair seating

Bracing has limited utility in DMD scoliosis. Unlike idiopathic adolescent scoliosis, where a brace can slow curve progression, neuromuscular scoliosis in DMD does not respond reliably to bracing, and braces can interfere with breathing and skin integrity. Most centers do not use a brace as a definitive treatment.

What does help is well-fitted wheelchair seating. Pelvic stabilization, lateral trunk supports, a properly contoured back, and accurate hip and knee positioning slow some of the postural drivers of curve progression. For background, see choosing a wheelchair in DMD.

When surgery is considered

Posterior spinal fusion is the standard surgical option for progressive DMD scoliosis. Indications vary by center, but a common pattern is:

• Curve magnitude exceeding 20 to 30 degrees, especially with documented progression.
• Loss of sitting balance or worsening pelvic obliquity.
• Pain or skin pressure problems from poor alignment.
• Pulmonary trajectory still adequate to tolerate surgery.

Instrumented fusion extending to the pelvis is widely used to correct pelvic obliquity and maintain a level seat. Studies show meaningful improvements in Cobb angle and pelvic obliquity, with positive effects on sitting tolerance, pain, and quality of life. (Spinal deformity in DMD, clinical assessment and surgery, MDPI)

Timing and pulmonary function

Pulmonary reserve is the most important constraint on surgical timing. Historically, forced vital capacity below 30 to 40 percent of predicted was considered a relative contraindication to spinal fusion. Modern anesthesia and post-operative non-invasive ventilation have shifted that threshold for many teams, but it remains a real consideration. (Spinal fusion in DMD with low FVC, PMC)

Doing the surgery earlier, while respiratory function is still robust, is one reason teams act on curves that might be watched longer in other conditions.

For background, see respiratory care in DMD and anesthesia safety in DMD.

What surgery does not change

Spinal fusion can correct alignment and pelvic obliquity, improve seating, and reduce pain. It does not change the underlying neuromuscular disease, will not restore lost muscle strength, and is followed by a recovery period that may require additional ventilatory and pain support.

Realistic expectations are part of informed consent.

Working with the orthopedic team

Most patients with DMD are followed by both the neuromuscular team and a pediatric orthopedic surgeon experienced with neuromuscular conditions. Families benefit from meeting the surgical team well before surgery is on the immediate horizon, so questions about timing, risks, and post-operative recovery can be answered without time pressure.

For more on the broader care plan, see DMD standards of care.

What is still uncertain

The optimal threshold for surgery, the impact of newer disease-modifying therapies on scoliosis trajectory, and long-term outcomes after instrumented fusion in the era of corticosteroids and modern respiratory care continue to be studied.

The reasonable framing is that scoliosis in DMD is monitored, modifiable, and managed individually. The decisions belong to the patient, family, and an experienced multidisciplinary team.

For related reading, see bone health in DMD, physical therapy in DMD, and DMD standards of care.

Disclaimer: This post is informational and does not constitute medical advice. Decisions about diagnosis or treatment must be made with a qualified care team.