MSK & Rheumatology Flashcards
Define osteoarthritis
Loss of cartilage, with bone remodelling and inflammation.
Define rheumatoid arthritis
Autoimmune inflammation of the synovial joints
Define osteoporosis
Progressive skeletal disease with reduced bone mass and micro-deteriorataion
Define osteomalacia
Inadequate mineralisation of osteoid framework
How does osteoarthritis clinically present?
Joint pain exacerbated by exercise.
Joint stiffness after rest (transient in the morning).
Reduced functionality.
Bony swellings (Distal interphalangeal Heberden’s and proximal interphalangeal Bouchard’s) and deformity.
Crepitus
How does rheumatoid arthritis clinically present?
Insidious onset of pain in the distal small jonts.
Morning stiffness (for more than 30 minutes).
Deformities: Ulnar deviation, swan neck and boutonniere.
How does osteoporosis clinically present?
Develops asymptomatically.
Bone fragility.
Fracture is often first sign (neck of femur).
Fractures in thoracic vertebrae may lead to kyphosis (widow’s stoop).
How does osteomalacia clinically present?
Proximal muscle weakness and pain.
Low bone density.
In children; bowed legs and knock knees.
Rheumatoid arthritis - note
DR: ‘Digital Rheumatoid’
Osteomalacia - note
‘Rickets’ in children
Pathophysiology of osteoarthritis
Progressive destruction of the articular cartilage (loss of articular space).
Exposed subchondral bone becomes sclerotic,
increasing vascularity
and subchondral cyst formation -> repair produces cartilaginous growths which become calcified (osteophytes).
Pathophysiology of rheumatoid arthritis
Infiltration of the synovium by inflammatory cells
- > angiogenic cytokines
- > Formation of new synovial blood vessels
- > Synovium proliferates and grows out over the surface of the cartilage producing a pannus
- > Pannus destroys the cartilage and subchondral bone
- > bony erosions
Pathophysiology of osteoporosis
Inadequate peak bone mass,
excessive bone resorption
and inadequate formation of new bone during remodelling.
Lack of oestrogen increases bone resorption and decreases bone deposition.
Deficiency of calcium -> Increased bone resorption through PTH.
RANKL binds to RANK, activating osteoclasts.
Pathophysiology of osteomalacia
Normal bone mineralisation depends on adequate calcium and phosphate.
Vitamin D promotes calcium absorption in the intestines, promotes bone resorption (by increasing osteoclast number).
Cause/s of osteoarthritis
Usually primary.
Sometimes secondary to particular joints that have been damaged/frequently used.
RF: Females,
FH, obesity, smoking
Cause/s of rheumatoid arthritis
HLA DR4 and DRB1 confer susceptability.
Triggering antigen not known.
Cause/s of osteoporosis
Menopause.
Nutritional deficiency, contributes.
Bone density naturally lost from 35.
Steroids can activate osteoclasts.
Causes of osteomalacia
Profound vitamin D deficiency.
Lack of exposure to sunlight and/or gastiointestinal malabsorption.
Epidemiology of osteoarthritis
Prevalence increases with age.
More common in women.
Most common form of arthritis.
Epidemiology of rheumatoid arthritis
1% of population will experience.
More common in women.
Peak incidence in 40s
Epidemiology of osteoporosis
More common in women, particularly following menopause.
Being thin.
Epidemiology of osteomalacia
More common in pigmented skin
and the elderly.
Diagnostic test for osteoarthritis
Examination: Diagnose in >45 yrs,
activity related joint pain,
with either no morning related stiffness
or <30 mins of it Xray: LOSS
Diagnostic test for rheumatoid arthritis
Anti-CCP: Most specific.
Rheumatoid factor (also AntiNuclear Antibody).
X ray: Loss of joint space
Erosions
Soft tissue swelling
Soft bones (osteopenia)
Diagnostic test for osteoporosis
Bone mass density assessment: DEXA.
Clinical.
Diagnostic test for osteomalacia
X ray: Defective mineralisation.
Treatments for osteoarthritis
Pain relief.
Exercise.
Weight loss.
Assistive devices.
Consider surgery as last resort for debilitating.
Interarticular corticosteroid injection.
Treatments for rheumatoid arthritis
DMARDs (sulfasalazine and methotrexate).
NSAIDs.
TNF-a inhibitor (infliximab)
Physiotherapy.
Interarticular corticosteroid injection.
Treatments for osteoporosis
Prevent fractures.
Calcium and vitamin D intake.
Bisphosphonates in those who have never had a fracture.
Oestrogen supplement.
Treatment for osteomalacia
Oral calciferol.
Complication of osteoarthritis
Reduced mobility
Complication of rheumatoid arthritis
Social impact
Complication of osteoporosis
Fractures
Sequelae of rheumatoid arthritis
Depression
Define Systemic Lupus Erythematosus
Heterogenous, inflammatory, multisystem autoimmune disease with antinuclear antibodies
Define Antiphospholipid syndrome
Autoimmune disorder characterised by arterial and venous thrombosis
and raised levels of antiphospholipid antibodies
Define Sjögrens syndrome
Lymphocytic infiltration of exocrine glands
Define Polymyositis
Inflammation
and necrosis of skeletal muscle fibres
How does Systemic Lupus Erythematosus clinically present?
Vast number of symptoms.
General: Fatigue, malaise, fever, splenomegaly, lympadenopathy, pleuritic chest pain, headache, Raynaud’s, mild hair loss myalgia.
Arthralgia: Symmetrical joint and muscle pain.
Mucocutaneous: Discoid lupus, potosensitive rash, butterfly rash
Pulmonary: pleurisy, fibrosing alveolitis, obliterative bronchiolitis
Cardiovascular: pericarditis, hypertension
Renal: nephritis, haematuria, hypertension, glomerulonephritis
Neuro: Anxiety and depression (almost any neuro manifestation).
How does Antiphospholipid syndrome clinically present?
Varied clinical features.
Peripheral artery thrombosis,
deep venous thrombosis,
cerebrovascular disease,
pregnancy loss,
MI,
retinal thrombosis,
pulmonary embolism and pulmonary hypertension.
How does Sjögrens syndrome clinically present?
Dry eyes,
dry mouth
and enlargement of the parotid glands.
Possibly blepharitis.
How does Polymyositis clinically present?
Symmetrical progressive muscle weakness and wasting, affecting the proximal muscles of the shoulder and pelvic girdle.
Difficulty squatting and with stairs, and with raising hands above head.
Can involve dysphagia and dysphonia if pharyngeal and laryngeal muscles are involved.
Systemic Lupus Erythematosus - note
It’s never lupus.
Antiphospholipid syndrome - note
Coagulation problems
Livedo reticularis
Obstetric problems
Thrombocytopenia
Pathophysiology of Systemic Lupus Erythematosus
Apoptotic cells and cell fragments are cleared inefficiently by phagocytes
- > transfer to lymphoid tissue
- > taken up by antigen presenting cells
- > self-antigens including nuclear components are presented to T cells
- > T cells stimulate B cells to produce autoantibodies against the antigens.
Clinical manifestations are mediated by antibody formation
and the development and deposition of immune complexes,
complement activation and influx of neutrophils and abnormal cytokine production.
Pathophysiology of Antiphospholipid syndrome
Proposed mechanisms for hypercoagulable effect of aPLantibodies include complement activation,
the production of antibodies against coagulation factors,
activation of platelets,
activation of vascular endothelium
and a reaction of antibodies to oxidised low density lipoprotein.
Pathophysiology of Sjögrens syndrome
Not fully known.
Possibly inflammation of the glands prompts autoimmune response.
Pathophysiology of Polymyositis
Mediated by cytotoxic T cells.
Involves autoimmune factors.
Cause/s of Systemic Lupus Erythematosus
Unknown.
Likely multifactorial.
Strong genetic association.
Ultraviolet light causes onset of rash.
Higher incidence premenopausal -> oestrogen has an effect.
Cause/s of Antiphospholipid syndrome
Unknown.
Some genetic association.
Cause/s of Sjögrens syndrome
Can be idiopathic (primary)
or associated with another autoimmune condition (secondary),
often rheumatoid arthritis.
Causes of Polymyositis
Unknown.
Epidemiology of Systemic Lupus Erythematosus
More common in premenopausal females.
Epidemiology of Antiphospholipid syndrome
Higher prevalence in black people.
Occurs most commonly in women of fertile age.
Epidemiology of Sjögrens syndrome
Classicallly disease of middle aged women.
Epidemiology of Polymyositis
Presents between 30 and 60 (small peak at 15).
Twice as common in females.
Diagnostic test for Systemic Lupus Erythematosus
FBC, ESR and antinuclear factor.
Diagnostic test for Antiphospholipid syndrome
Screen for aPL antibodies.
Diagnostic test for Sjögrens syndrome
Serum antibodies.
Schirmer’s test: Whether the eye can self hydrate.
Diagnostic test for Polymyositis
Muscle biopsy.
Treatments for Systemic Lupus Erythematosus
Avoid sunlight and smoking.
NSAIDs and coritcosteroid for arthralgia.
Immunosuppressives for severe symptoms.
Rituximab.
Treatments for Antiphospholipid syndrome
Healthy lifestyle.
Acute management of thrombosis: Heparin
Treatment for Sjögrens syndrome
Artificial tear and saliva replacement.
Treatment for Polymyositis
Oral prednisalone.
Complications of Systemic Lupus Erythematosus
Depends on organ involvement
Complications of Antiphospholipid syndrome
Stroke. MI
Complications of Sjögrens syndrome
Infection of eyes or mouth.
Complications of Polymyositis
Interstitial lung disease,
dysphagia,
infection.