Disease of the Musculoskeletal system Flashcards
What is Bursitis?
- Inflammation of bursa.
- Bursae are synovial membrane lined pockets that serve to allow free movement of adjacent structures where otherwise, there could be friction.
What is Enthesitis?
- example
- Inflammation of an enthesis. Entheses are the points where tendons, ligaments or joint capsules insert into bone.
- The largest site is the Achilles insertion.
Define the following:
Osteoporosis –
Osteomalacia –
Osteomyelitis –
Osteosarcoma –
- Osteoporosis – Reduced bone density
- Osteomalacia – Poor bone mineralisation
- Osteomyelitis – Bone infection
- Osteosarcoma – An example of malignant bone tumour
What are the following muscle conditions?
- Myalgia
- Myositis
- Myalgia - Pain in muscles.
- Very common.
- Commonly associated with viral infections.
- Can be drug-induced (eg by statins).
- Myositis - Inflammation of the muscles.
- Far less common than myalgia and can be autoimmune
What are some points to consider when someone presents with joint pain?
- Is it Articular or
- Non-articular/ periarticular
- Inflammatory or
- Non inflammatory/ degenerative/ mechanical
- How many joints are affected
- monoarthritis
- oligoarthritis 2-5
- polyarthritis 5+
- Duration of onset
Review this flow chart
What are likely differential diagnosis based on the number of joints affected?
- Monoarticular (1)
- Oligoarticular (2-4)
- Polyarticular (≥5)
- Monoarticular (1)
- Trauma, hemarthrosis, spondyloarthropathy
- Septic, crystal-induced
- Oligoarticular (2-4)
- Spondyloarthropathy, crystal-induced, infection
- Polyarticular (≥5)
- RA, SLE, crystal-induced, infectious
You are asked to review a patient presenting with thenar eminence atrophy. Which nerve do you think is affected?
Median
Which epicondyle is affected in tennis elbow?
1) Medial
2) Lateral
Lateral
(medial is golfer)
What are the key differences between Inflammatory and Non-Inflammatory pain?
Morning stiffness
Activity
Rest
Worst time of day
Fatigue
Steroids
50 year old ex-rugby player presents with 3 years of painful swollen right knee and painful left hip. He works as builder and by the end of the day the pain is worse. Rest and elevation of the knee helps the pain. EMS lasts 30 minutes.
is this Inflammatory or non-inflammatory
Non-Inflammatory
50 year old ex-rugby player presents with 3 years of painful swollen right knee and painful left hip. He works as builder and by the end of the day the pain is worse. Rest and elevation of the knee helps the pain. EMS lasts 30 minutes.
30 year old female, who presents with a three-month history of painful, swollen MCPs and wrists. The pain is worse in the mornings and EMS lasts 3 hours. Heat and movement help the pain but when she stops moving her hands the pain returns.
is this Inflammatory or non-inflammatory
Inflammatory
30 year old female, who presents with a three month history of painful, swollen MCPs and wrists. The pain is worse in the mornings and EMS lasts 3 hours. Heat and movement help the pain but when she stops moving her hands the pain returns.
You are asked to review a 35 year old male, who presents with a 2 days history of a painful, swollen right knee. What are your differential diagnosis?
1) Post-traumatic hemarthrosis
2) Gout
3) Septic arthritis
4) All of the above
All the above
- if a joint is hot and swollen always do a joint aspiration
What needs to be identified when a Joint Aspiration is done when septic arthritis is a differential?
- Check
- Send for
Check:
- Clarity
- Colour - straw-coloured/ clear
- Viscosity - easily retractable
Send for:
- Gram stain (TB)
- Bacterial Culture
- Crystals
- White cell differential
What are important points about how septic arthritis presents and how it is managed
- Mortality rates are of 11%. This increases to 50% in polyarticular disease with sepsis.
- The commonest organisms are staph and strep
- Always think about it in a patient with a (usually) single, hot and swollen joint.
- They do not have to be systemically unwell and they may be able to weight bear.
- Seek senior advice. Do not delay antibiotic therapy.
Take? Give?
What is the Sepsis 6
Take
- Cultures
- Lactate
- Urine output
Give
- High flow oxygen
- IV antibiotics
- Fluids
What is Gout?
- when the serum urate levels are > physiological saturation point
- leads to monosodium urate crystal formation and deposit in
- cartilage (ear)
- bone
- periarticular tissues or peripheral joints (toe)
Who gets Gout?
- Men aged 40 years and over
- Women over 65 years
- It increases with age, affecting 15% of men aged over 75 in the United Kingdom
- Metabolic syndrome and its components (insulin resistance, obesity, hyperlipidaemia, and hypertension) are strongly associated with gout
What are risk factors for Gout?
- Male sex/ Older age
- Genetic factors (mainly reduced excretion of urate)
- Chronic kidney disease (reduced excretion of urate)
- Metabolic syndrome
- Obesity
- Hypertension
- Hyperlipidaemia
- Loop and thiazide diuretics (reduce excretion of urate)
- Osteoarthritis (enhanced crystal formation)
- Dietary factors (increased production of uric acid)
What crystals are you expecting to find in the knee fluid aspirated from our previous patient if you suspect clinically that he has gout?
Monosodium urate
How is Gout managed?
- Conservative (2)
- Acute (3)
- Long term (2)
Conservative:
- Reduce alcohol and high purine foods
- Diabetic control
Acute attacks:
- NSAIDs e.g. naproxen
- Colchicine
- Steroids
Long term:
- Urate-lowering therapy e.g. allopurinol or febuxostat or benzbromarone
- Anakinra (IL-1 antagonist)
55 year old with sudden pain and swelling right knee. You are waiting for aspiration results to return but his observations are normal. Bloods come back and uric acid is normal but calcium is high.
- What is the main differential diagnosis
1) Septic
2) Gout
3) Calcium Pyrophosphate Deposition
Calcium Pyrophosphate Deposition
How do Calcium Pyrophosphate crystals appear under a microscope?
Positively birefringent
What pathology is seen in this X-ray?
- wat indicates this?
Chondrocalcinosis
- it should be a solid black line between the joints,
- however you can see shadowing as you have some crystal deposition
What is the management of Calcium Pyrophosphate Deposition (CPPD)?
- conservative
- acute
- long term
Conservative:
- Hot / cold pack
- Immobilisation
Acute attacks:
- NSAIDs e.g. naproxen
- Colchicine
- Steroids
Long term:
- Colchicine prophylaxis
- Anakinra (IL-1 antagonist)
How does Osteoarthritis commonly present?
- common in older age
- most commonly clinically affects the
- knees
- hips
- small joints of the hands (DIP, PIP 1st CMCJ)
- commonly characterised by joint pain and very variable degrees of functional limitation
What are radiological signs of Osteoarthritis?
- osteophyte
- reduced joint space
- sclerosis
What radiological signs are commonly seen in Osteoarthritis of the hand?
- what signs would be seen in the actual hand and where(2)
- Gullwing deformities
- Heberden’s nodes (PIP)
- Bouchard’s nodes (DIP)
What does this image show and what do the arrows point to?
- Osteoarthritis of the hands
Bouchard’s nodes (PIPs)
Heberden’s nodes (DIPs)
What is the pathophysiology of Osteoarthritis?
- Metabolically active, dynamic process involving all joint tissues (cartilage, bone, synovium, capsule, ligaments/muscles)
- Focal destruction of articular cartilage
- Remodelling of adjacent bone = hypertrophic reaction at joint margins (osteophytes)
- Remodelling and repair process (efficient but SLOW)
- Secondary synovial inflammation and crystal deposition
What are the clinical features of Osteoarthritis?
- Age > 50 years
- Morning stiffness < 30 minutes
- Persistent joint pain aggravated on use
- Crepitus
- NO INFLAMMATION
- Bony enlargement and/or tenderness (not bogginess like synovial inflammation)