Understanding NF1 and Spinal Deformity
Neurofibromatosis Type 1 (NF1) is a genetic condition that affects the skin, bones, and nervous
system. One of its most significant orthopedic manifestations is scoliosis; which can be
dystrophic (structurally abnormal vertebrae) or non-dystrophic (similar to idiopathic curves).
Dystrophic scoliosis in NF1 is unique. The bones are often small, scalloped, and weakened by
underlying dural ectasia (expansion of the spinal canal). The ribs may be thin or “penciled,” and
the curve can be short, sharp, and rigid; making both diagnosis and treatment highly
specialized.
At the Paley Orthopedic & Spine Institute, Dr. Arun Hariharan applies modern navigation and
imaging tools to correct NF1-related scoliosis safely while minimizing risk to the spinal cord and
surrounding tissue.
Why the Spine Curves in NF1
Scoliosis in NF1 occurs because of bony dysplasia, an imbalance in how vertebrae grow and
remodel over time. Factors include:
- Vertebral scalloping (erosion from dural ectasia).
- Asymmetric growth of ribs and vertebral bodies.
- Paraspinal neurofibromas altering local biomechanics.
- Connective tissue weakness from the underlying gene defect.
Dystrophic scoliosis often develops early in childhood and can progress rapidly. Without early
recognition, the curve may become rigid, leading to severe deformity or neurologic compromise.
Evaluation and Diagnosis
Comprehensive spine evaluation includes:
- Standing EOS imaging for 3D assessment with minimal radiation.
- MRI of the entire spine to identify dural ectasia and neurofibromas.
- CT scan for bony detail and surgical planning.
- Neurologic examination to evaluate strength, balance, and reflexes.
Dr. Hariharan emphasizes the importance of distinguishing dystrophic from non-dystrophic
curves, since the former require more aggressive stabilization to prevent collapse.
Non-Surgical Management
Bracing can be useful for mild, flexible curves, but bracing rarely halts progression in
dystrophic scoliosis. Close monitoring every 4–6 months is critical during growth.
Physical therapy supports core strength and posture but cannot prevent structural deterioration
when bone dysplasia is present.
Surgical Management
Surgery becomes necessary when curves exceed 45–50 degrees, or when there is vertebral
erosion, progressive deformity, or neurologic symptoms.
Dr. Hariharan’s surgical strategy focuses on early, definitive stabilization using advanced
technology:
- Navigation-guided instrumentation to safely place screws in dysplastic vertebrae.
- Segmental fixation with limited fusion levels to preserve mobility.
- Posterior release and osteotomies for stiff, angular curves.
- Neuromonitoring (SSEPs, MEPs) for spinal cord protection.
- Allograft and biologics to promote fusion in compromised bone.
In cases of severe dystrophic changes, anterior support with strut grafts or cages may be added
to maintain correction.
Dr. Hariharan’s Surgical Philosophy
“NF1 scoliosis requires respect for the anatomy and precision in every step. Navigation and
neuromonitoring allow us to operate safely even in the most distorted spines, restoring balance
while protecting the cord.”
— Dr. Arun Hariharan
At Paley Orthopedic & Spine Institute, surgery is never just about correction; it’s about long-term stability, pain reduction,
and preserving as much motion as possible.
Recovery and Long-Term Care
After surgery, patients begin gradual rehabilitation focused on flexibility and posture.
Follow-up includes:
- Radiographic surveillance every 6–12 months.
- MRI if neurologic changes develop.
- Collaboration with NF clinics and genetics specialists for ongoing care.
Most patients experience improved posture, pain relief, and stable long-term correction.
Consultation and Contact
If your child has Neurofibromatosis Type 1 and scoliosis, you can learn more or schedule a
consultation with Dr. Arun Hariharan at the Paley Orthopedic & Spine Institute in West Palm
Beach, Florida.
Written by Dr. Arun Hariharan, Pediatric Spine Surgeon at the Paley Orthopedic & Spine
Institute in West Palm Beach, Florida. Dr. Hariharan specializes in complex spinal
deformities including NF1, skeletal dysplasia, and neuromuscular scoliosis, offering state-
of-the-art surgical and non-surgical care.