MSK and Rheumatology Flashcards
What is osteoarthritis?
- Osteoarthritis (OA) is an age-related, dynamic reaction pattern of a joint in response to insult or injury.
- All tissues of the joint are involved, but primarily the articular cartilage.
What is the clinical presentation of osteoarthritis?
- Joint pain exacerbated by exercise
- Joint stiffness after rest (Including short-lived pain in the morning <30 mins)
- Bony swellings (on the distal interphalangeal are called Herberden’s nodes, on the proximal interphalangeal are called Bouchard’s nodes - both are more common in osteoarthritis).
- Deformity of joint/ surrounding structure.
- Crepitus (Describes popping, clicking and crackling sounds within the joint).
- Asymmetrical
What is the pathophysiology of osteoarthritis?
- Chondrocytes and inflammatory cells in the surrounding tissues release enzymes.
- These enzymes result in the breakdown of collagen and proteoglycans, subsequently the breakdown of articular cartilage.
- This exposes the subchondral bone which then becomes sclerosed.
- Bone is remodelled, resulting in the formation of osteophytes and subchondral cysts.
- Joint space is lost/narrowed over time.
What are the risk factors of osteoarthritis?
- Older age
- Female
- Obese
- Family history
- Trauma to joint
What are the diagnostic tests for osteoarthritis?
- DIAGNOSIS IS USUALLY CLINICAL.
- X-ray will show: Osteophytes, subchondral cysts, reduced joint space, subarticular sclerosis.
How is osteoarthritis treated?
1st line:
- Exercise/physio (increases joint lubrication, therefore decreasing pain).
- Topical analgesics, (NSAID’s such as diclofenac)
- Paracetamol.
2nd line:
- Corticosteroid injections (if NSAIDS/paracetamol are not sufficient or contraindicated).
If pain persists despite multiple treatment modalities, or patient has severe disability:
- Surgery (joint replacement).
What is rheumatoid arthritis?
- Chronic inflammatory disease.
- Affects the small joints of the hands and feet
What is the clinical presentation of rheumatoid arthritis?
- Tender and swollen joints.
- Active symmetrical arthritis lasting >6 weeks.
- Joint pain on touch.
- > 1 hour of morning stiffness.
- Characteristic deformities: Swan neck, Boutonnière deformity, ulnar deviation, rheumatoid nodules.
What is the pathophysiology of rheumatoid arthritis?
- Inflammation of the synovium.
- Angiogenesis, cellular hyperplasia, influx of inflammatory cells (both innate and specific ones), cytokine secretion (TNF-a, IL1 and IL6).
- Locally invasive synovial tissue forms (called a “pannus”).
- Pannus causes the the bony erosions typically seen in RA.
What are the risk factors associated with rheumatoid arthritis?
- HLA DR4 and HLA DR1 make a person susceptible to rheumatoid arthritis.
- Family history.
- Smoking.
What are the tests used to diagnose rheumatoid arthritis?
1st line: RF. If this comes back negative but RA still suspected, use anti-CCP (more accurate).
X-ray: If bony erosions seen, prognosis is significantly worse.
How is rheumatoid arthritis treated?
1st line:
- Methotrexate or hydroxychloroquine (DMARD).
- Prednisolone (corticosteroid).
2nd line:
- Add a biological agent such as infliximab (TNF-a inhibitor).
For acute flares: Corticosteroid injections such as methylprednisolone acetate, or NSAIDS such as ibuprofen.
What are the complications of rheumatoid arthritis?
- Work disability.
- Increased mortality
- CVD risk increased
What are the differential diagnoses for RA? How are they different?
- PA (usually has psoriasis too)
- SLE (arthritis seen in SLE doesn’t normally cause deformations).
- OA (Gets WORSE with movement, and is usually asymmetrical).
What is osteoporosis?
- Progressive skeletal disease with reduced bone density and micro-deterioration of the bones.
- Results in increased susceptibility to fracture and increased bone fragility.
OSTEOMALACIA IS REDUCED MINERALISATION OF BONES DUE TO VIT D DEFICIENCY.
OSTEOPOROSIS IS REDUCED OVERALL BONE DENSITY.
What is the clinical presentation of osteoporosis?
- Often the first sign is fracture, typically of the neck of the femur.
- Micro-fractures in the thoracic vertebrae over time may lead to kyphosis of the spine, and back pain.
What are all the different pathophysiologies of osteoporosis?
Varied and depends on the root cause. For example:
- Coeliac (impaired calcium absorption in gut).
- RA (disrupts bone remodelling)
- Hyperparathyroidism (increases bone resorption).
There are many other causes too…
What are the causes/risk factors of osteoporosis?
SHATTERED:
- Steroid use
- Hyperthyroidism/parathyroidism
- Alcohol and tobacco
- Thin
- Testosterone LOW
- Early meopause
- Renal or liver failure
- Erosive/inflammatory bone disease
- Dietary calcium decrease/ DM type 1.
What are the tests used to diagnose osteoporosis?
- Bone mass density assessment (DEXA scan)
- T score < or = -2.5 indicates osteoporosis
- -1 > T score > -2.5 indicates osteopenia
- If there are ALSO micro-fractures present, indicates severe osteoporosis.
What treatment is given for osteoporosis?
1st line:
- Alendronic acid (biphosphonates).
- Calcium and calciferol (vitamin D) supplementation.
2nd line:
- Denosumab. This is a RANK ligand inhibitor.
What are the main complications of osteoporosis?
- Recurrent fractures (especially hip/rib).
- Chronic pain.
What is osteomalacia?
What is rickets?
- Metabolic bone disease.
- Deficient bone mineralisation WITHOUT LOSS OF BONE MATRIX (as seen in osteoporosis).
- Rickets is the same pathophysiology, but occurs prior to growth plate closure.
What is the clinical presentation of osteomalacia?
- Fractures (especially long bones such as the femur).
- Bone pain at the typical fracture sites.
- Signs of vit. D or calcium deficiency.
What is the pathophysiology of osteomalacia/rickets?
- Depends on the causative mechanism.
- Low vit. D and/or calcium causes growth plate disorganisation (rickets) or deficient mineralisation of the bone (osteomalacia).
- CKD causes increased FGF-23 release. This stimulates increased calcium excretion, increased phosphate retention, decreased vit. D production.
- KEY DIFFERENCE: OSTEOPOROSIS WILL SEE OVERALL LOSS OF BONY MATRIX, OSTEOMALACIA IS JUST DEMINERALISATION RATHER THAN LOSS OF BONE MATRIX ITSELF.
What are the risk factors of osteomalacia?
- Calcium/vit D deficiency.
- Malabsorption disorder (e.g. coeliac).
- Malnutrition.
- CKD.
- Hyperparathyroidism.
- Low sunlight.
What diagnostic tests are used for osteomalacia?
- Serum calcium. Low or normal.
- 25-hydroxyvitamin-D. Less than 25 nanomol/L indicates high risk of osteomalacia.
- Raised ALP.
GOLD STANDARD: Bone X-ray to assess for defective mineralisation.
What is the treatment for osteomalacia?
1st line:
- Ergocalciferol (source of vitamin D)
AND
- Calcium carbonate/calcium citrate (source of calcium).
What is Systemic Lupus Erythematosus (SLE)?
- A multi-systemic autoimmune disease.
- It is characterised by the presence of antinuclear antibodies (ANA) in the patient’s serum.
What are key signs/symptoms of SLE?
Key symptoms/signs:
- Malar (butterfly) rash (also photosensitive).
- Arthralgia.
- Fatigue.
What is the pathophysiology of SLE?
What type of hypersensitivity reaction?
- Autoimmune disorder. ANA (anti-nuclear antibodies) produced.
- Cell necrosis increased, and clearance of apoptosed material is decreased.
- Further stimulates autoimmune processes and production of ANAs.
- Type III hypersensitivity disorder.
What are the risk factors of SLE?
- Female
- 30-70 YO
- FH
What are the potential complications of SLE?
- Thrombocytopenia
- Leukopenia
- Anaemia
What are the investigations carried out on a patient with suspected SLE?
- ANA testing. Positive suggests SLE
- If positive, then an anti dsDNA test is done. If elevated, suggests SLE.
- ESR/CRP (ESR is raised, CRP normal as SLE is an autoimmune disease).
What is the treatment for a patient with SLE?
1st line:
- Avoid sunlight and smoking.
- Give hydroxychloroquine (DMARD)
- Naproxen (NSAID) for arthralgia.
What is SLE short for?
- Systemic Lupus Erythematosus.
What are the two types of crystal arthropathy?
- Gout
- Pseudogout
What is gout?
Hyperuricaemia resulting in the deposition of urate crystals in the joints.
What is the clinical presentation of gout?
- A joint becomes swollen, extremely tender and erythematous.
- Usually affects 4 or less joints.
- Presence of tophi (uric acid crystal depositions in the skin/joint surfaces).
- Usually seen in the metatarsalphalangeal joint of the big toe.
- “One of the most painful acute conditions human beings can experience”.
What is the pathophysiology of gout?
- Purine broken down into urate via xanthine oxidase enzymes.
- Uric acid is excreted renally. However, if too much is in the blood (hyperuricaemia), it precipitates in the joints causing gout.
What are the potential complications of hyperuricaemia other than gout?
- Nephropathy (CKD risk increased)
- Nephrolithiasis.
What are the risk factors associated with gout?
- Male
- Meat/seafood consumption
- Alcohol
- Genetic predisposition.
What are the investigations used for gout?
- Arthrocentesis (joint aspiration) + synovial fluid analysis.
- Will show NEGATIVELY BIFRINGENT NEEDLE CRYSTALS.
- “N+N”
How is gout treated?
Acute attack:
Analgesia: naproxen (NSAID), prednisolone injection (corticosteroid) and/or colchicine.
Chronic management: Allopurinol (xanthine oxidase inhibitor).
What is pseudogout?
- Deposition of calcium pyrophosphate crystals within the joints.
What is the clinical presentation of pseudogout?
- Moderate joint pain (not as bad as gout).
- Larger joints typically involved (knee most common).
What is the pathophysiology of pseudogout?
Excess of calcium in the blood, which is then deposited as calcium pyrophosphate crystals in the joint.
What are the risk factors for pseudogout?
- Hyperparathyroidism (high calcium)
- Old age.
- Joint injury.
What is the investigation used to diagnose pseudogout definitively?
- Arthrocentesis (joint aspiration) + synovial fluid analysis.
- Will show positively bifringent, rhomboid shaped crystals.
What is the treatment for pseudogout?
1st line:
- Dexamethasone injection (corticosteroids)
- Naproxen (NSAIDs) if systemic polyarticular.
Preventative measures:
- Potentially low-dose colchicine.
What are the 3 types of spondyloarthropathy?
- Ankylosing spondylitis
- Psoriatic arthritis
- Reactive arthritis
What is a spondyloarthropathy?
- Joint disease affecting the joints in the spine and nearby.
- HLA B27 association.
What is ankylosing spondylitis?
- Chronic progressive inflammatory disorder of the spine.
- Causes severe spinal pain and stiffness.
What is the clinical presentation of ankylosing spondylitis?
- Inflammatory back pain (early morning stiffness, insidious onset, lasts >3 months).
- Iritis/uveitis common.
- Insidious onset.
- Late teens/early 20’s male.
What is the pathophysiology of ankylosing spondylitis?
- Chronic inflammation of the enthesitis of the spine.
- Causes fibrosis and calcification of the enthesitis.
What is the epidemiology of ankylosing spondylitis?
- Late teens/early 20’s.
- Male
- HLA-B27 +ve
What investigations are used in ankylosing spondylitis?
- X-ray of pelvis. Sacroliitis (inflammation of the sacroiliac joint) suggests ankylosing spondylitis.
- “bamboo spine” from re-healing of the spinal ligaments.
- HLA-B27 testing. +ve
What is the treatment given for ankylosing spondylitis?
Just spinal involvment:
- Physiotherapy
- Naproxen (NSAIDS.
- Can use hydrocortisone injections into the enthesitis.
Peripheral joint involvment:
- Sulfasalazine (DMARD) .
- Infliximab (tnf-a inhibitor) if DMARD unsuccessful.
What is psoriatic arthritis?
- Chronic inflammatory arthritis associated with psoriasis.
What is the clinical presentation of psoriatic arthritis?
- Inflammatory joint pain, meaning:
>30 mins morning stiffness.
Better on movement
Worse on rest - DIP involvement.
- Asymmetrical.
- Mono/oligoarticular.
- Dactylitis (swelling of entire finger).
- History of psoriasis (may only be recognised as nail/scalp difficulties.
What are the risk factors for psoriatic arthritis?
- Psoriasis. Most significant risk factor.
- FH of psoriasis/psoriatic arthritis.
- HLA-B27 +ve (57% of psoriatic arthritis cases).
What investigations are used to diagnose psoriatic arthritis?
- X ray of hands/feet.
- DIP joint erosion.
- In later-stage disease, pencil in cup deformity. (end of bone has sharpened into a pencil like shape, and the more proximal bone has been eroded into a cup-like shape).
- HLA B27 genetic test - +ve
What is the treatment for psoriatic arthritis?
If disease is limited:
Naproxen (NSAIDS) + prednisolone injections (corticosteroids).
Physiotherapy.
If disease is progressive:
- Add methotrexate (DMARD).
- 2nd line is infliximab (tnf-a inhibitor).
What is reactive arthritis?
- Inflammatory arthritis that occurs following a GI or GU infection.
What are the two types of reactive arthritis and what are the typical causative organisms?
- GI. Usually caused by Campylobacter, Salmonella or Shigella.
- GU. Usually caused by Chlamydia trachomatis.
What is the typical clinical presentation of reactive arthritis?
- 1-4 weeks after a GI or GU infection.
“Can’t see, can’t pee, can’t climb a tree”
- Conjunctivitis
- Urethritis
- Arthritis
- Enthesitis of achilles heel.
What is the pathophysiology of reactive arthritis?
- Infection stimulates an autoimmune attack on healthy, normal joint tissues.
What are the risk factors associated with reactive arthritis?
- Recent GI/GU infection.
- HLA-B27 positive.
- Male.
What investigations are used to diagnose reactive arthritis?
- ESR/CRP raised
- HLA-B27 +ve (not very specific).
X-ray:
- Enthesitis of the achilles.
- Sacroiliitis of the spine.
EXCLUDING OTHER DISEASES:
- RF and anti-CCP negative (rules out rheumatoid arthritis).
- ANA negative. (rules out SLE, helps rule out RA).
What is the treatment for reactive arthritis?
1st line:
- Naproxen (NSAID) + prednisolone injections (corticosteroids).
For persistent or recurrent reactive arthritis:
- Sulfasalazine (conventional DMARD).
- ANTIBIOTICS NOT INDICATED UNLESS THERE IS AN ACTIVE GU OR GI INFECTION STILL.
What are the five main things that all spondyloarthropathies share?
1) Asymmetrical peripheral arthritis (different to RA)
2) Absence of rheumatoid factor/ anti-CCP (different to RA)
3) Inflammation of the enthesitis.
4) Strong HLA-B27 association.
5) Commonly associated with axial (spinal) inflammation.
What are the two MSK diseases directly caused by infection?
- Septic arthritis
- Osteomyelitis
What is septic arthritis?
Infection of one (typically) or more joints caused by microbes entering the joint capsule. Can be due to direct infection or haematogenous spread.
What is the typical presentation of septic arthritis?
- Hot, swollen, painful joint.
- Acute presentation.
- Pain on both active and passive movement.
- Fever.
- Most commonly monoarticular and affecting the knee.
What is the most common causative organism of septic arthritis and osteomyelitis?
Most commonly caused by staphylococcus aureus infection (gram +ve, round, clustered bacteria).
What are the potential complications of septic arthritis?
- Osteomyelitis (if the infection spreads to the bone).
- Joint destruction (If the infection is inadequately treated/treated late).
What are the risk factors associated with septic arthritis?
- Underlying joint disease (OA, RA etc.)
- Prosthetic joint
- Over 80
- Immunocompromised
- IV drug use (increases risk of microbes entering the bloodstream).
What are the investigations used for septic arthritis?
- Joint aspiration and synovial fluid culture. If possible, do before administering antibiotics.
- Blood culture (especially useful to establish a haematogenous spread).
What is the treatment for septic arthritis?
If there is systemic involvement:
- Follow local sepsis guidance (e.g. SEPSIS-6).
If there is no systemic involvement:
- Amoxicillin (empirical antibiotics)
- Joint aspiration (to remove infectious fluids.)
- Ibuprofen (NSAID) for pain.
If the joint is prosthetic, consider surgery.
What is osteomyelitis?
Acute inflammatory condition due to infection of the bone.
What is the clinical presentation of osteomyelitis?
- Limp/inability to bear weight.
- Non-specific pain at site of infection.
- Fever
- Reduced ROM.
- If disease is chronic, sinus formation may occur (a passage from the infected bone to the skin surface).
What is the pathophysiology of osteomyelitis?
- Infection of the bone. Usually Staph. A.
- Can be due to direct infection, or haematogenous spread.
- A sequestrum may form due to destruction of bone, and this serves as a site for the infection to cultivate.
What are the risk factors for osteomyelitis?
- Most common in children under 5.
- Previous osteomyelitis.
- Penetrative injury/surgery.
- Immunosuppression.
- IV drug use.
- CKD
What are the investigations used for suspected osteomyelitis?
- X-ray. May take a few days for disease to be visible (bone destruction, osteopenia, sequestrum formation).
- Blood/bone culture (may show causative organism).
- ESR/CRP raised.
What is the treatment for osteomyelitis?
If septic, SEPSIS-6.
- Ibuprofen and limb immobilisation to relieve pain.
- Flucloxacillin 1st line.
- If allergic to penicillin OR high chance of MRSA cause, first line is vancomycin.
- Consider surgery if bone continues to deteriorate.
What is multiple myeloma?
- Malignant disease of the bone marrow plasma cells.
What is the clinical presentation of multiple myeloma?
REMEMBER “CRAB”:
- hyperCalcaemia
- Renal impairment
- ANAEMIA
- BONE PAIN
What are the risk factors for MM?
- Abnormal free light-chain ratio.
- FH
- Radiation exposure.
What is the epidemiology of multiple myeloma?
- Peak presentation at 70 years old.
What are the investigations used for multiple myeloma?
- Bone marrow biopsy. Will show plasma cell infiltration in the bone marrow (gold standard).
- FBC: Anaemia
- Whole body CT to find osteolytic lesions/fractures.
What is the treatment for multiple myeloma?
Chemotherapy (Thalidomide) + dexamethasone (corticosteroids).
- Stem cell transplant (if illegible).
What is fibromyalgia?
- Chronic widespread body pain.
What is the clinical presentation of fibromyalgia?
- Chronic, widespread pain.
- Unrefreshing sleep and tiredness.
- Symptoms generally worse in the cold and under stress.
What is the pathophysiology of fibromyalgia?
- Unknown.
What are the risk factors associated with fibromyalgia?
- Women
- 20-60
- FH
What are the investigations used for fibromyalgia?
- There are none.
- Diagnosis is clinical.
- Chronic (>3 months), widespread body pain associated with fatigue and sleep disturbance.
What is the treatment for fibromyalgia?
- 1st line is amitriptyline (tricyclic antidepressant) + CBT.
What is Paget’s disease?
Increased bone turnover, leading to enlarged and disorganised bone structure.
What are the symptoms of Paget’s disease?
- Bone pain and deformity.
- Pathological fractures.
What is the pathophysiology of Paget’s disease?
- Increased osteoclast activity.
- In response, increased osteoblast activity.
- Because the bones are formed faster, they are structurally compromised.
- This results in pathological fractures and misshapen bones.
What are the investigations used in Paget’s disease?
- X-ray. Will show deformity and lytic lesions in the bones (commonly long bones, pelvis and skull).
- Blood tests. Specific alkaline phosphate will be raised. (ALP).
- Bone biopsy has highest specificity and sensitivity (gold standard). However, is contraindicated in weight bearing bones.
What is the treatment for Paget’s disease?
- Alendronic acid (1st line)
IMPORTANT TO MONITOR CALCIUM LEVELS.
What is vasculitis?
- Inflammation of the blood vessels.
What are the two types of vasculitis I need to be aware of?
- Giant cell arteritis.
- Granulomatosis with polyangitis (formerly known as Wegener’s granulomatosis).
How does giant cell arteritis present?
- Scalp tenderness.
- Headache.
- Vision changes (amaurosis fugax).
How does granulomatosis with polyangitis present?
Classic triad:
- Upper respiratory tract involvement.
- Lower respiratory tract involvement.
- Glomerulonephritis.
What is the treatment for giant cell arteritis?
- Prednisolone.
What is the treatment for granulomatosis with polyangitis?
- Prednisolone + cyclophosphamide.
What is cauda equina syndrome?
- Compression of the cauda equina (a continuation of the spinal cord).
What are the symptoms of cauda equina syndrome?
- Bladder dysfunction.
- Bilateral sciatica (pain in lower back, buttocks and upper thigh).
- Saddle anaesthesia (numbness in buttocks, perianal area, upper thighs).
What are the signs of cauda equina syndrome?
- Lower limb weakness/numbness and reduced anal tone.
What is the investigation for cauda equina syndrome?
- MRI lower spine.
What is the treatment for cauda equina syndrome?
- Nerosurgical decompression of Cauda equina.
What is the presentation of spinal cord compression?
- Back pain.
- Sensory/motor deficit.
What are the common causes of spinal cord compression?
- Spine trauma.
- Vertebral compression fracture.
- Vertebral disk herniation.
- Primary/metastatic spinal tumor.
- Spinal infection.
What is the investigation for spinal cord compression?
- MRI.
What is the treatment for spinal cord compression?
- Immobilise the patient.
- Neurosurgical decompression of the spinal cord.
What is Brown-sequard syndrome?
- Hemisection of the spinal cord.
What is the presentation of Brown-sequard syndrome?
- Ipsilateral loss of vibration/proprioception below the level of the lesion (dorsal column).
- Ipsilateral paralysis below the level of the lesion (corticospinal tract).
- CONTRALATERAL loss of temperature and pain sensation A FEW SEGMENTS BELOW LEVEL OF LESION (spinothalamic tract).
What is the investigation for Brown-sequard syndrome?
MRI spine.
What is the treatment for Brown-sequard syndrome?
- Normally neurosurgical decompression.
What is degenerative disc disease?
- A complex condition associated with degeneration of the spinal discs.
What is the investigation for spinal disc degeneration?
What are the findings?
- MRI lumbar spine.
- Disc compression/ tears.
What is the treatment for spinal disc degeneration?
- Paracetamol + ibuprofen (analgesia).
- ONLY IF SURE IT IS NOTHING MORE SEVERE.