Classification | Clinical and laboratory features | Pathological features |
Required for all:
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Clinico-pathologically defined IBM | Knee extension weakness ≥ hip flexion weakness and/or Finger flexion weakness > shoulder abduction weakness | All of the above features |
Clinically defined IBM | Knee extension weakness ≥ hip flexion weakness and Finger flexion weakness > shoulder abduction weakness | One or more of above features |
Probable IBM | Knee extension weakness ≥ hip flexion weakness or Finger flexion weakness > shoulder abduction weakness | One or more of above features |
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