Which physical findings are characteristic of type II spinal muscle atrophy (SMA)?

Updated: Nov 05, 2018
  • Author: Ashish S Ranade, MBBS, MS, MRCS; Chief Editor: Jeffrey A Goldstein, MD  more...
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Patients with type II SMA have head control, and 75% of these patients can sit independently. Muscular weakness is greater in the lower extremities than in the upper extremities. Patellar reflex is absent. The young may demonstrate bicipital and triceps tendon reflexes. Tongue fasciculations are present, as are upper-extremity tremors. Scoliosis is universal, and most patients develop hip dislocation, either unilateral or bilateral, when younger than 10 years.

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