Spino-Cerebellar Ataxia with normal vestibular-ocular reflex.
Age at test 41

Key Signs:
The two cases of SCA shown below indicate how balance and gait tests may be used to screen fore early systems of SCA with and without central vestibular problems. Two legged stance is normal in this patient, but as soon as the patient is required to perform tasks with stance on one leg, especially tandem gait, excessive roll angle values are observed (see first set of traces below), and the time takes to complete such tasks is longer. Note that pitch and roll trunk control are equally unstable. For the task of walking over barriers, roll is very unstable (see second set of traces). The patient could not perform the task of walking up and down stairs without assistance, thus the Index in the Summary is only available without stairs.

Roll, pitch angle plot
Walking 8 tandem steps
Pitch velocity range plot  Roll velocity range plot   Pitch velocity range plot  Pitch velocity range plot
Walking over low barriers spaced 1 m apart
Roll, pitch angle plot
Summary Data:
Indicates that patient cannot control trunk roll sway well when required. Thus the gait/stance ratio for roll angle is abnormal. Stance tasks are performed within normal bounds.

Greater than normal. BCS summary plot
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