Reference - EULAR text book

Key characteristics of steroid myopathy include;

• Worsening of proximal muscle weakness—predominantly in the lower extremities
• Creatine kinase levels improved or normal
• Improvement with reduction of glucocorticoid dose
• No signs of active myositis on electromyography or MRI
• Selective atrophy of type II muscle fibres
• Increased urinary creatinine excretion
• Obvious extra muscular signs of glucocorticoid use: Cushing features
• Worsening of neck flexor weakness is an indicator of active myositis