How is SLE clinical manifestation in mucus membranes and musculoskeletal system?

Mucus membranes (25-45% of pt, ulcers, painless, mouth>nasal) Musculoskeletal (53-95% of pt, arthritis (non-erosive, non-deforming arthritis, transient migratory or reversible, rhupis, Jaccoud arthropathy [hand deformity MCP joints/swan neck]) Myositis (generalized, inflammatory 4-16%) avascular bone necrosis (major cause of morbidity and disability, shoulders hips and knees, induced ischemia by raynauds vasculitis, fat emboli, cortisol, Antiphospholipid syndrome (APS), osteonecrosis shortly after shot of high dose corticosteroids)