Monoarticular joint pain - Clinical Medicine Flashcards
Which major joint are affected by arthritis?
- Knee
- Hip
- Shoulder
- Elbow
- Ankle
Describe the types of joints
Fibrous - fibrous joint bone joined to another bone by fibrous tissue
Primary cartilaginous - bone joined by hyaline cartilage
Seconday cartilaginous - cartilage united by fibrous tissue
Synovial
Label the structures of the synovial joint
List the structure of the synovial joint
- Periosteum
- Articulatng bone
- Articulating cartilage
- Synovial or joint cavity
- Fibrous capsule & Synovial membrane = Articular capsule
What does the synovial membrane lining the joint produce?
Synovial fluid
Describe the role of the synovial fluid
It is rich in nutrition and so provides nutrition to the hyaline cartilage
a) Does hyaline cartilage have blood supply and give a reason for your answer
b) Where does hyaline cartilage derive its nutrition from?
c) Once the hyaline cartilage is damged how is it repaired?
a) No beacuse there are no blood vessels
b) Synovial fluid (produced by the synovial membrane)
c) Repairs by forming fibrous tissue
What is osteoarthritis?
OA is the degeneration/break down of the entire joint - cartilage, synovium, ligaments and bone
a) Which joints are most commonly affected by OA?
b) Within the hands which joints are usually affacted?
c) Describe the deformities seen in the hands due to OA and why this occurs
a) Knees, hips and hands
b) MTP, DIP and PIP joints
c) Bochard’s nodes on PIP and Heberden’s nodes on DIP. This is due to osteophytes
Describe the onset of OA and which age it particulary affects
Onset is gradual, usually > 40 years old
List some risk factors of OA
- Increasing age
- Female gender
- Occupation
- Muscle weakness
- Obesity
- Inflammatory joint disease
- Lack of osteoporosis
- Trauma
- Metabolic conditons e.g., alkaptonuria, acromegaly
Describe the symptoms/clinical features of osteoarthritis
- Onset is gradual and worse on activity
- Pain at day and especially night
- Pain using joint
- Stiffness
- Swelling
- Deformity
- Weakness
- Reduced mobility
- Daily activities compromised
What are the radiological features of osetoarthritis?
LOSS
Loss of joint space
Osteophytes
Subchondral cysts
Subchondral scelerosis
Which movement is first lost in OA of hip?
Internal rotation
Describe the appearence of the synovial joint in osteoarthritis
- Hyaline cartlage is eroded
- Bone is exposed
How does OA manifest itself in the knee?
- Usually both knees
- Pain on walking especially up and down- stairs and hills
- Stiffness
- Visible deformity of knee often described as” knobbly”
- Swelling of knee
- Wasting of thigh muscles
- Warm knee to touch
- Knees may “give way”
- Crepitus
- Tender on feeling around knee
How does OA manifest itself in the hip?
- Constant nagging pain
- Worse at night
- Cannot get into a comfortable position at night
- Pain radiation into knee
- Back pain due to altered gait
- Painful walking-antalgic gait
- May need a walking stick in opposite hand
- Stiff hip unable to cut toenails, put on tights, socks and shoes
- Progressive shortening of leg
How does OA manifests itself in the shoulder?
- Pain at night disturbs sleep
- Day-time with painkillers - pain tolerable
- Stiffness difficulty wiping bottom
- Stiffness unable to get food to mouth
- Stiffness difficulty washing and combing hair
- Stiffness difficulty dressing
- Stiffness unable to raise arm
- Marked crepitus
a) What does the treatment of OA focus on?
b) List the treatment options
a) Treatment focuses on relieiving symptoms and improving function
b)
- Patient education
- Excercise
- Weight control
- Use of analgesia/orthosis (splint)
- Surgery
List non-operative managment of OA
- Education
- Lifestyle advice e.g., weight loss, regular excercise, avoidance of impact-loading activites
- NSAIDs
- Physiotherapy
- Support and braces
- TENS
- Intra-articular corticosteroid injections
- Capsaicin (An active component of chili peppers - capsaicin creams and patches help relieve pain)
List operative management of osteoarthritis
- Arthroplasty (Joint replacement)
- Arthrodesis (Joint fusion)
- Osteotomy (joint realignment)
- Joint excision
a) List the pros of a joint replacement
b) List the cons of a joint replacement
a) Pros
- Almost instant cure of arthritic pain
- Return of mobility
- ‘Normal life’ - get life back
- Majority of joints are long lasting, only few need revisions
b) Cons
- Operation
- Major complictions e.g., death
- Other complications e.g., infection
- Revision surgeries
- Need to be careful
What do the NICE guidlines say about referring for consideration of a joint replacememnt
- Patients should be referred before there is prolonged and established functional limitation and severe pain
- Patient-specific factors (including age, sex, smoking, obesity) should not be barriers to referral for joint surgery
- Offer regular reviews to all people with symptomatic osteoarthritis e.g., reviewing the effictiveness and tolerabilty of treatments
- Annual reviews should be considered if the person has one or more of:
- Other illnesses or conditions
- Troublesome joint pain, more than one joint affected
- Or are taking drugs for their osteoarthritis
List complications of a joint replacement surgery
- Infection
- Metal on metal
- Dislocations
- Venous thromboembolism
- Aseptic looseing
- Leg length discrepancy
- Nerve palsy
- Fracture
- Ongoing pain
a) How are infections reduced in joint replacement surgey
b) What do you do if an infection occurs?
c) what do you not do?
a) Reduced by clean filtered air and prophylactic antibiotics
b) Contact orthopaedic department and refer early
c) Do not aspirate outisde an operating theatre and do not start antibiotics unless patient’s life is in imminent danger
Why is there increased venous thromboebolism in hip and knee replacements?
- They are immobile
- There are alteration in the blood
How is venous thromboebolism reduced after joint replacement surgery?
- Early mobilisation post-op
- TED stockings
- Intra-operatively calf pumps
- Chemical prophylaxis e.g., warfarin, aspirin, Rivaroxaban (factor Xa inhibitor) daily oral requires no tests
Which crystals are involved in:
A) Gout
b) Pseudogout
a) Monosodium urate (uric acid)
b) Calcium pyrophosphate dihydrate (CPPD)
Describe the difference in synovial fluid between normal synovial fluid and crystal synovitis. Include volume (ml), viscosity, colour, WBC/mm3, PMN (%) (type of WBC called granular leukocyte/granulocyte) and crystals (present/not)
Normal
- __Volume (ml) = <3.5
- Viscosity = Very high
- Colour = Clear
- WBC/mm3 = 200
- PMN (%) = <25%
- Crystals = None
Crystal synovitis
- Volume (ml) = >3.5
- Viscosity = Low
- Colour = Straw/opaque
- WBC/mm3 = >10,000
- PMN (%) = >50%
- Crystals = Present
Explain the pathology of gout
- Prolonged hyperuricemia leads to the formation of monosodium urate crystals by:
1. Over production of uric acid (exogenous or endogenous)
2. Underexcretion of uric acid (abnormal renal ahndling of urate)
3. A combination of both - These deposit in the synovium, connective tissues and kidneys.
- Joint inflammation is mediated by phagocytosis of the crystals by polymorphonuclear leucocytes.
- Uric acid crystal deposition in the kidneys can cause interstitial nephritis, renal stones and acute tubular damage.
What are causes of hyperuricemia due to to over production?
- Excess dietry purines (e.g., seafood shellfish (including anchovies, sardines, herring, mussels, codfish, scallops, trout, and haddock). Some meats, such as bacon, turkey, and organ meats like liver)
- Alcohol abuse
- Myeloproliferative disorder
- Lymphoproliferative disorder
What are causes of hyperuricemia due to under excretion?
- Renal disease
- Polycystic kidney disease
List the drugs that cause hyperuricemia
CAN’T LEAP
Cyclosporine
Alcohol
Nicotinic acid
Thiazides
Lasix (frusemid)
Ethambutol (anti-tuberculosis treatment)
Aspirin (low dose)
Pyrazinamide (anti-tuberculosis treatment)