Management Strategies for Spinal Muscular Atrophy - SMA Type II and Type III

Spinal Muscular Atrophy Types II (intermediate) and III (juvenile) represent chronic forms of lower motor neuron degeneration that present distinct clinical management challenges. While individuals with SMA Type II achieve sitting balance but cannot walk, those with SMA Type III maintain walking capacity well into childhood or adulthood. Long-term care for both groups centers on preserving physical function, preventing secondary deformities, and maintaining pulmonary health.

As muscle weakness progresses, orthopedic complications predictably arise. Progressive scoliosis, joint contractures, and hip subluxations are common due to muscular imbalances surrounding the spine and large joints. A multidisciplinary rehabilitation approach is necessary to manage these changes:

• Physical Therapy: Focuses on maintaining range of motion, stretching tight joint groups, strengthening preserved muscle groups without inducing fatigue, and encouraging weight-bearing activities.

• Orthotics and Bracing: The use of spinal orthoses (thoracolumbosacral orthoses) helps stabilize trunk posture and delay scoliosis progression. Knee-ankle-foot orthoses (KAFOs) and standing frames facilitate upright positioning, which supports bone mineral density and hip development.

• Occupational Therapy: Adaptations in fine motor tasks, adaptive eating utensils, and specialized seating devices optimize independence in daily living activities.

• Respiratory Surveillance: Regular monitoring of Forced Vital Capacity (FVC) is required. Assisted coughing techniques and non-invasive ventilation should be introduced early during acute respiratory infections to mitigate failure risks.