MSK Flashcards
What are the 3 conditions making up the seronegative spondyloarthropathies?
Ankylosing spondylitis
Psoriatic arthritis
Reactive arthritis
What joints are mainly affected in ankylosing spondylitis?
Vetebral column joints
Sacroiliac joints
What gene is associated with ankylosing spondylitis
HLA-B27
What is the typical presentation of ankylosing spondylitis
Young adult male in their 20s with:
Pain and stiffness in the lower back
Sacroiliac pain
Pain and stiffness is worse in the morning and takes around 30 mins to improve, improves with exercise and worsens with rest
What symptoms can one experience other than back and sacroiliac pain in ankylosing spondylitis
Chest pain related to the costovertebral and sternocostal joints
Enthesitis (inflammation of the entheses, where tendons or ligaments insert into bone)
Dactylitis (inflammation of the entire finger)
Vertebral fractures (presenting with sudden-onset new neck or back pain)
Shortness of breath relating to restricted chest wall movement)
What conditions are associated with ankylosing spondylitis
5A’s
Anterior uveitis
Aortic regurgitation
Atrioventricular block
Apical lung fibrosis
Anaemia of chronic disease
Investigations for anklyosing spondylitis
Schober’s test - mark 10cm above and 5cm below L5 vertebrae and ask patient to bend forward –> length of <20cm between points = supportive of anklyosing spondylitis
ESR/CRP
HLA-B27 gene testing
X-ray of spine and sacrum
MRI of spine
What would an X-ray show in anklyosing spondylitis
Sacroiliitis: subchondral erosions, sclerosis
Squaring of lumbar vertebrae
‘bamboo spine’ (late & uncommon)
Syndesmophytes: due to ossification of outer fibers of annulus fibrosus
Apical fibrosis in CXR
What would an MRI of show in ankylosing spondylitis
Bone marrow oedema in sacroiliac joints
Management of ankylosing spondylitis
Regular exercise
1st line = NSAIDs
Anti-TNF therapy (if high disease activity) - adalimumab, etanercept or infliximab
Physiotherapy
What is the function of bursae
They act to reduce the friction between the bones and soft tissues during movement.
What are the causes of bursitis
Friction from repetives movement or leaning on the elbow
Trauma
Infection - septic bursitis
Inflammatory conditions - rheumatoid arthritis or gout
What are the symptoms of olecranon bursitis
Young/middle-aged man with an elbow that is:
Swollen
Warm
Tender
Fluctuant (fluid filled)
How do you identify that bursitis is caused by infection
Hot to touch
More tender on plapation
Erythema spreading to surrounding skin
Fever
Skin abrasion overlying the bursa
Features of sepsis - tachycardia, hypotensions, confusion)
Investigations for olecranon bursitis
Clinical diagnosis
If infection suspected:
Aspiration of bursal fluid and examine fluid:
Pus = infection
Straw-coloured = infection less likely
blood stained = trauma, infection or inflammatory cause
Milky = gout or psuedogout
Microscopy and culture of fluid:
Gram staining for bacteria
Examine for crystals = gout/pseudogout
Management of olecranon bursitis
Rest
Ice
Compression
Analgesia (e.g., paracetamol or NSAIDs)
Protecting the elbow from pressure or trauma
Aspiration of fluid may relieve pressure
Steroid injections may be used in problematic cases where infection has been excluded
Treatment of olecranon bursitis due to infective cause
Aspiration for microscopy and culture
Antibiotics - flucloxacillin (2nd line = clarithromycin)
IF septic = sepsis 6
Presentation of trochanteric bursitis
Middle aged patient with:
Gradual onset hip pain (over greater trochanter) - aching or burning
May radiate down the outer thigh
Worse with activity, standing after sitting and trying to sit cross legged
Tenderness over geeater trochanter
What would be the examination finding in trochanteric bursitis
Positive Trendelenburg test
Resisted abduction of the hip
Resisted internal rotation of the hip
Resisted external rotation of the hip
What is the Trendelenburg test
Involves asking the patient to stand one-legged on the affected leg. Normally, the other side of the pelvis should remain level or tilt upwards slightly. A positive Trendelenburg test is when the other side of the pelvis drops down, suggesting weakness in the affected hip.
Management of trochanteric bursitis
Rest
Ice
Analgesia (e.g., ibuprofen or naproxen)
Physiotherapy
Steroid injections
Define compartment syndrome
Where the pressure within a fascial compartment is abnormally elevated, cutting off the blood flow to the contents of that compartment
If compartment syndrome is not treated in time what can occur
Tissue necrosis
Where does compartment syndrome most commonly affect
Leg
Forearm
Feet
Thigh
Buttocks
What is the presentation of compartment syndrome
Usually after an acute injury like:
Bone fracture
Crush injuries
Presentation: 5 P’s
Pain - disproportionate to underlying injury (not made better with analgesics) and made worse by stretching
Parathesia
Pale
Pressure (high)
Paralysis (a late and worrying feature)
Investigations for compartment syndrome
Needle manometry
- Pressures >20mmHg is abnormal and >40mmHg is diagnostic
Management of compartment syndrome
Initial:
Removing any bandages/dressing
Elevation of leg
Maintaing good BP (avoid hypotension)
Emergency fasciotomy - cutting the fascia to release pressure
- Debridement of any necrotic tissue too
What are patients undergoing fasciotomy due to compartment syndrome at risk of and what is given to avoid this
Myoglobinuria - myoglobin released from dead RBCs and enters blood stream where it reaches kidneys and excreted
Breakdown of myoglobin can damage kidney
Patient given aggressive IV fluids to prevent this
What is chronic compartment syndrome
Usually due to exertion
During exertion, the pressure within the compartment rises, blood flow to the compartment is restricted, and symptoms start. During rest, the pressure falls, and symptoms begin to resolve. It is not an emergency.
Same treatment and symptoms as acute
What are the two types of crystal arthropathies
Gout
Pseudogout
What is gout
Chronically high blood uric aci levels with urate crystals deposited in the joints causing them to become inflamed
What are the risk factors for gout
Male
Family history
Obesity
High purine diet (meat and seafood)
Alcohol
Diuretics
Cardiovascular disease
Kidney disease
What joints are mostly affected in gout
Metatarsophalangeal joint (base of big toe)
Carpometacarpal joint (base of thumb)
Knee
Ankle
What are the symptoms of gout
Acute - develop meaximal intesnsity within 12 hours:
Pain of the joint
Swelling of the joint
Erythema of the joint
Investigations for gout
Uric acid levels:
- Above 360umol/L = gout strongly suspected
Synovial fluid analysis from joint aspiration shows:
Monosodium urate crystals
Needle shaped crystals
Neatively birefringent under polarised light
What can gout show on X-rays
Lytic lesions
Punched out erosions
Erosions have sclerotic borders with overhanging edges
Joint effusion
Management of gout
Acute flares:
1st line = NSAIDs (with PPIs)
2nd line = colchicine
3rd line = steroids (prednisolone)
Prophylaxis:
Allopurinol
Febuxostat
(once allopurinol is started, continue it even during another acute attack as well as taking meds for acute flares)
Lifestyle changes:
No alcohol
Minimising purine diet
What is pseudogout caused by
Deposition of calcium pyrophosphate dihydrate crystals in the synovium
Presentation of pseudogout
Joint is:
Hot
Swollen
Stiff
Painful
What joints does pseudogout affect
Knee (most common)
Shoulders
Hips
Wrists
Investigations for pseudogout
Joint aspiration shows:
Calcium pyrophoshpate crystals
Rhomboid shaped crytals
Positively birefringent of polarised light
X-ray
What does an x-ray show in pseudogout
Chondrocalcinosis - calcium deposits in the joint cartilage show up in a thin white line in the middle of the joint space.
LOSS
Loss of joint space
Osteophytes (bone spurs)
Subarticular sclerosis (increased density of the bone along the joint line)
Subchondral cysts (fluid filled holes in the bones)
Management of pseudogout
NSAIDs (with PPIs)
Colchicine
Intra-articular steroid injections
Oral steroids
What is fibromyalgia
Widespread pain throughout the body with tender points at specific anatomical sites
Typical presentation of fibromyalgia
Women between 30 and 50 with:
Chronic pain at multiple sites, sometimes pain all over
Lethargy
Cognitive impairment (fibro fog)
Sleep disturbances
Headaches
Dizziness
Investigations for fibromyalgia
History of widespread pain
Pain must be present at 11 of the 18 tender point sites published by American College of Rheumatology
classification criteria
Management of fibromyalgia
Aerobic exercise
CBT
Pregabalin
Duloxetine
Amitriptyline
What are the risk factors for osteoarthritis
Female
Obese
Age
Occupation
Trauma
Family history
What are the most common sites for osteoarthritis
Hips
Knees
Distal interphalangeal joints (DIP) in the hands
Carpometacarpal (CMC) joint at base of thumb
Lumbar spine
Cervial spine (cervial spondylosis)
Pathophysiology of osteoarthritis
Imbalance between cartilage damage and the chondrocyte response
Presentation of osteoarthritis in the hands
Usually bilateral
Episodic aching pain provoked by movement and relieved by rest
Stifness
Painless nodes:
Bouchard’s nodes - PIPJs
Heberden’s nodes - DIPJs
Squaring of the base of thumbs
Weak grip
Presentation of osteoarthritis in the hip
Chronic history of aching groin pain following exercise and relieved by rest
Investigations for osteoarthritis
Clinical if typical features
X-ray shows LOSS:
Loss of joint spcae
Osteophytes
Subchondral sclerosis
Subchondral cysts
Management of osteoarthritis
Weight loss advice, local muscle strengthening exercises
1st line = topical NSAIDs
2nd line = oral NSAIDs
(PPI co-prescribed)
IF above do not work then:
Intra-articular injections (last for 2-10 weeks)
If all do not work then:
Joint replacement
What are the adverse affects of long term NSAIDs use
GI side effects - gastritis, peptic ulcers
Renal - AKI (acute tubular necrosis) and CKD
Cardio - hypertension, heart failure, MI, stroke
Exacerbating asthma
What is osteomalacia
Soften bones caused by insufficient Vitamin D
What does Vitamin D help absorb
Helps absorb Calcium and Phosphate in the intestines and kindeys
Why may patients with osteomalacia get secondary hyperparathyroidism
Decreased Vitamin D = insufficient Calcium and Phosphate absorption = increased PTH released = secondary hyperparathyroidism
Causes of osteomalacia
Vitamin d deficiency:
- malabsorption
- lack of sunlight
- diet
CKD
Durg induced - anti-convulsants
Liver disease = cirrhosis
Coeliac disease
Inherited: hypophosphatemic rickets (previously called vitamin D-resistant rickets)
Presentation of osteomalcia
Fatigue
Bone pain
Muscle pain
Muscle aches
Pathological or abnormal fractures
Proximal myopathy - waddling gait
Investigations for osteomalacia
Serum 25-hydroxyvitamin D (VItamin D) = low
Serum calcium =
Serum phosphate = low
Serum alkaline phosphatase = high
PTH = high (secondary hyperparathyroidism)
What will X-rays show in osteomalacia
Translucent bands (Looser’s zones or psuedofractures)
Looser zones are fragility fractures that go partially through the bone
Management of osteomalacia
Vitamin D supplementation (loading dose is often needed)
Calcium supplementation if dietary calcium is inadequate
Why does NICE recommend testing serum calcium a month after loading dose of Vitamin D
NICE CKS (2022) recommend checking the serum calcium within a month of the loading regime. It may be:
Low in calcium deficiency
High in primary hyperparathyroidism (previously masked by the vitamin D deficiency)
High in other conditions that cause hypercalcaemia, such as cancer, sarcoidosis or tuberculosis
What is osteomyelitis
Refers to inflammation in a bone and bone marrow
What are the two main ways somoene can acquire osteomyelitis
Haematogenous osteomyelitis = pathogen is carried through the blood and seeded in the bone
Non-haematogenous spread - due to direct contamination of the bone, for example, at a fracture site or during an orthopaedic operation
What organism most commonly causes osteomyelitis
Staphylococcus aureus
Risk factors for osteomyelitis
Open fractures
Orthopaedic operations (specifically with prosthetic joints)
Diabetes (particularly with diabetic foot ulcers)
Peripheral arterial disease
IV drug use
Immunosuppression
Presentation of osteomyelitis
Fever
Pain and tenderness around site of infection
Erythema around site of infection
Swelling around site of infection
Muscle aches
Lethargy
Investigations for osteomyelitis
Bloods:
Raised WCC, ESR, CRP
Blood cultures - identify causative organism
MRI
Bone cultures
Management of osteomyelitis
6 weeks of flucloxacillin (clindamycin for penicllin allergy)
- possibly with rifampicin or fusidic acid
IF MRSA:
vancomycin or teicoplanin
IF associated with prosthetic joints then:
complete revision surgery to replace prosthesis
Treatment of chronic osteomyelitis
3 or more months of antibiotics
What is paget’s disease of bone
Excessive bone turnover (reabsorption and formation) due to increased osteoclast and osteoblast activity
Where does paget’s disease most commonly affect
Axial skeleton:
Spine
Skull
Risk factors for paget’s disease of bone
Male
Increasing age
Family history
Northern latitude
Presentation of paget’s disease of bone
Bone pain (e.g. pelvis, lumbar spine, femur)
Bone deformity - bowing of tibia and/or bossing of skull
Fractures
Hearing loss
Investigations for paget’s disease of bone
Bloods:
Raised ALP
Normal calcium and phosphate
X-ray
Bone scintigraphy - increased uptake is seen focally at the sites of active bone lesions
What are the X-ray findings in paget’s disease of bone
Bone enlargement and deformity
Osteoporosis circumscripta (well-defined osteolytic lesions that appear less dense compared with normal bone)
Cotton wool appearance of the skull (poorly defined patchy areas of increased and decreased density)
V-shaped osteolytic defects in the long bones
What is the management of paget’s disease of bone? What are the aims of treatment?
Aims:
- Eliminate bone pain
- Normalise serum alkaline posphatase
Bisphosphanates - oral risendronate
Calcitonin
Analgesia
Complications of paget’s disease of bone
Fractures
Hearing loss (affects bones in the ear)
Heart failure (due to hypervascularity of abnormal bone)
Osteosarcoma
Spinal stenosis = spinal canal narrowing = cord compression = nuerological symtpoms
What are the features of polymyalgia rheumatica
Usually rapid onset (< 1 month)
Aching and morning stifness in proximal muscles - neck, shoulders and hips
Worse in the morning, after rest or inactivity
Inteferes with sleep
Improves with activity
Investigations for polymyalgia rheumatica
Clinical diagnosis but can also check inflammatory markers:
ESR/CRP usually raised
Also bloods to exclude differentials:
FBC
Renal profile (U&E)
LFTs
Calcium (abnormal in hyperparathyroidism, cancer and osteomalacia)
Serum protein electrophoresis for myeloma
Thyroid-stimulating hormone for thyroid function
Creatine kinase for myositis
Rheumatoid factor for rheumatoid arthritis
Urine dipstick
Anti-nuclear antibodies (ANA) for systemic lupus erythematosus
Anti-cyclic citrullinated peptide (anti-CCP) for rheumatoid arthritis
Urine Bence Jones protein for myeloma
Chest x-ray for lung and mediastinal abnormalities (e.g., lung cancer or lymphoma)
Treatment of polymyalgia rehumatica
Reducing regime of prednisolone:
15mg until the symptoms are fully controlled, then
12.5mg for 3 weeks, then
10mg for 4-6 weeks, then
Reducing by 1mg every 4-8 weeks
What is the additional management for patients on long term steroids? (there is a mnemonic)
Don’t STOP:
Don’t – steroid dependence occurs after 3 weeks of treatment, and abruptly stopping risks adrenal crisis
S – Sick day rules (steroid doses may need to be increased if the patient becomes unwell)
T – Treatment card – patients should carry a steroid treatment card to alert others that they are steroid-dependent
O – Osteoporosis prevention may be required (e.g., bisphosphonates and calcium and vitamin D)
P – Proton pump inhibitors are considered for gastro-protection (e.g., omeprazole)
What are the four bony parts of the ankle?
Medial malleolus
Lateral malleolus
Tibial plafond
Talus
What are the main symptoms of an ankle fractue
Bony tenderness over the injured area
Inability to walk four weight bearing steps immediately after the injury/in A&E
Soft tissue swelling
Deformity - ankle dislocation
Neurovascular deficity - dislocation can cause nerve injury or compression
What are the investigations for an ankle fracture
X-ray
Full neurovascular assessment:
Dorsalis pedis and posterior tibialis pulse
Capillary refill in toes
Sensation over dorsum of foot, first web spaces, distal sole and heel
Ottowa ankle rules
What are the Ottowa ankle rules and what are its components?
Determine the need for radiographs in acute ankle injuries
An ankle X-ray is only required if:
There is any pain in the malleolar zone; and,
Any one of the following:
Bone tenderness along the distal 6 cm of the posterior edge of the tibia or tip of the medial malleolus, OR
Bone tenderness along the distal 6 cm of the posterior edge of the fibula or tip of the lateral malleolus, OR
An inability to bear weight both immediately and in the emergency department for four steps.
What is Weber classification of the lateral malleolus
Type A - below the ankle joint - syndesmosis intact
Type B - at level of ankle joint - syndesmosis intact or partially torn
Type C - above the ankle joint - syndesmosis will be disrupted
According to the Ottowa rules, when is a foot x-ray indicated?
A foot X-ray series is indicated if:
There is any pain in the midfoot zone; and,
Any one of the following:
Bone tenderness at the base of the fifth metatarsal (for foot injuries), OR
Bone tenderness at the navicular bone (for foot injuries), OR
An inability to bear weight both immediately and in the emergency department for four steps.
Treatment for ankle fractures
Usually open reduction and internal fixation
What are the two different locations of hip fractures?
Intracapsular
- Femoral head fractures: These are rare and often associated with dislocations.
- Femoral neck fractures: More common and further classified as subcapital, transcervical, and basicervical.
Extracapsular
- Intertrochanteric fractures: Occur between the greater and lesser trochanters.
- Subtrochanteric fractures: Occur below the lesser trochanter.
What is the system called which grades a hip fracture
Garden system classifications:
Type I: Stable fracture with impaction in valgus
Type II: Complete fracture but undisplaced
Type III: Displaced fracture, usually rotated and angulated, but still has boney contact
Type IV: Complete boney disruption
Blood supply disruption is most common following Types III and IV.
What are the symptoms of a hip fracture
Pain
Shortened and externall rotated leg
Patients with non-displaced or incomplete neck of femur fractures may be able to weight bear
Treatment for hip fractures
Intracapsular:
Undisplaced Fracture:
internal fixation, or hemiarthroplasty if unfit.
Displaced Fracture:
Arthroplasty (total hip replacement or hemiarthroplasty) to all patients with a displaced intracapsular hip fracture
Total hip replacement is favoured to hemiarthroplasty if patients:
- were able to walk independently out of doors with no more than the use of a stick and
- are not cognitively impaired and
- are medically fit for anaesthesia and the procedure.
Extracapsular:
Management
stable intertrochanteric fractures: dynamic hip screw
if reverse oblique, transverse or subtrochanteric fractures: intramedullary device
What is the most commonly fractured metatarsal
The proximal 5th metatarsal
What are the three different types of metatarsal fractures
Proximal avulsion fractures (pseudo-jones) - occurs at proximal tuberosity and is associated with lateral ankle sprain/inversion injuries
Jones fracture - transverse fracture at the metaphyseal-diaphyseal junction
Metatarsal stress fracture - occurs in athletes, most common site is 2nd metatarsal shaft
What are the symptoms of a metatarsal fracture
Pain and bony tenderness
Swelling
Antalgic gait
Investigations for metatarsal fractures
X-ray - determines whether stable, displaced or stress fracture
Stress fractures do not show on x-rays hence:
Isotope scan or MRI
Whats the difference between direct and indirect injury to the patella
Direct - usually follows a direct blow or trauma to the front of the knee
Indirect - happens when the quadriceps forcefully contracts against a block to knee extension
Clinical features of a patella fracture
Swelling
Bruising
Pain and tenderness around the knee
Palpable gap may be felt
Investigations for a patella fracture
AP and lateral x-rays
Skyline vciew if diagnosis is sitll unclear after AP and lateral
Management of a patella fracture
Undisplaced (particularly vertical fractures with intact extensor mechanism) - hinged knee brace for 6 weeks and patients allowed to fully weight bear
Displaced & loss of extensor mechanism - operative management w/ tension band wire, inter-fragmentary screws or cerclarge wires followed by hinged knee brace for 4-6 weeks
What are the risk factors for developing achilles tendon disorders
Quinolone use - ciprofloxacin
Hypercholesterolaemia (predisposed to tendon xanthomata)
What are the symptoms of achilles tendonopathy (tendonitis)
Gradual onset of posterior heel pain that is worse following activity
Morning pain and stiffness
Management for achilles tendonopathy (tendonitis)
Supportive
Simple analgesia
Reduction in precipitating activity
Calf muscle eccentric exercises
What may a patient describe if they have ruptured their achilles tendon
Audible pop in ankle
Sudden nset significant pain in calf or ankle
Inability to walk or continue playing sports
How to examine if a patient has ruptured their achilles tendon
Simmond’s triad:
Ask patient to lie prone with feet hanging off the bed
1) Abnormal angle of declination - injured foot may be more dorsiflexed
2) Squeeze the calf muscle and the foot should plantarflex, injured foot will not mvoe
3) Feel for a gap in the tendon
Investigation and management for achilles tendon rupture
Ultrasound
Refferal to orthopaedics
What is a sprain
stretching, partial or complete tear of a ligament
What is a syndesmosis
fibrous joint in which two adjacent bones are linked by a strong membrane or ligaments
E.G. syndesmosis beween tibia and fibular
How do patients with a lower ankle sprain present
Pain
Swelling
and
Tenderness over affected ligament
Usually able to weight bear unless severe
How do youy classify low ankle sprains
Grade 1 (mild) - stretch or micro tear to ligament, minimal bruising and swelling, no pain on weight bearing
Grade 2 (moderate) - Partial tear to ligament, Moderate brusing and swelling and minimal pain on weight bearing
Grade 3 (severe) - complete tear to ligament, severe bruising and swelling, severe pain on weight bearing
Investigations for a low ankle sprain
X-ray accoridng to Ottowa ankle rules (to check for fracture)
MRI - if persistent pain
Most common mechanism of injury for high ankle sprains
External rotation of the foot causing talus to push fibula laterally
Presentation of high ankle sprains
Pain
Swelling
Tenderness
Pain when squeezing tibia and fibula together (Hopkin’s squeeze test)
Investigations for high ankle sprains
X-ray - widening of tibiofibular joint (diastasis) or ankle mortise
MRI - if suspicious of syndesmosis injury
Treatment for high ankle sprains
IF no diastasis - non-weight bearing orthosis or cast until pain subsides
IF diastasis (or failed non-operative management) - operative fixation