Rheum 1 (OA, Gout, Pseudogout, Fibromyalgia) Flashcards
Describe the pathogenesis of OA
- Cartilage loss
- Disease of the bone (changes in biomechanics and age)
- Inflammation and immunologic (swelling and stiffness)
Types of OA
- Idiopathic, primary
- Localized: hands, feet, hips, knees, spine
- Generalized (3+ joint sites) - Secondary– Areas that you would not except OA due to mechanics alone
Secondary causes of OA
- Trauma
- CPPD (pseudogout)
- RA
- Gout
- DM
- Hypothyroidism
- Congenital (Hips)
- Neuromuscular dz (DM)
**usually asymmetric involvment
Risk Factors for OA
- Sex: F>M
- Age: >45
- Obesity
- Hereditary
- HX of trauma
- Metabolic disorders (DM, CPPD)
Defining features of gout
- Deposition of monosodium urate (MSU) crystals in joint, bone and soft tissue
- MSU crystals are NEEDLE shaped
Types of Gout
- Asymptomatic hyperuricemia
- All pts w/ gout have hyperuricema but not all hyperuricemas are due to gout - Acute gout –> acute arthritis
- Interval (”Intercritical”) gout (cycles)
- Chronic gout leads to tophaceous gout
Causes of hyperuricemia that leads to gout
- overproduction of uric acid–> can cause stones
2. underexcretion of uric acid
Risk factors for gout
- Trauma or surgery (increase inflammatory response)
- Anorexia
- Diet (beer, organ meats, shellfish, asparagus, spinach, beans, mushrooms)
- Meds (thiazides or loop and allopurinol)
- Men and postmeno women
Defining features of pseudogout
- Deposition of calcium pyrophosphate dihydrate (CPPD) crystals in connective tissues
- Rhomboid shaped
- Acute attacks induce synovitis
Risk factors for pseudogout
- Idiopathic
- Joint trauma
- Surgery
- Familial chondrocalcinosis
- Hemochromatosis
- Hyperparathyroidism (excess Ca2+)
- Avg. age 72
Diagnosis of OA is based on the combination of:
- age
- HX
- PE Findings
- Xray findings
**No labs tell you its OA
Key features of OA
- OA does not affect all joints equally (asymmetric)
- MC joints: Knees, hips, hands, cervical and lumbar spine
- LC joints: Elbows, ankles, wrists
Get good Hx (likely secondary to trauma)
Symptoms of OA
- Pain with use; improvement with rest
- Morning stiffness <30 minutes
- Decreased range of motion
- Lack of systemic symptoms
- Stiffness after prolonged immobility (gelling)
PE findings of OA
- Localized tenderness to the joint
- Bony enlargement
- Crepitus
- Patella femoral pain
- Restricted range of motion
- +/- Swelling
- specific joint signs
What are specific joint signs for OA in: Hands Knees Toes Spine
- Hands: Heberden’s and Bouchard’s nodes
- shelf sign at 1st CMC joint - Knees: genu varum/valgum
- Toes: hallux valgus
- Spine: C and L decreased ROM
Herberden Nodes affect ___ joint where as Bouchard’s nodes affect __ joint
H: DIPs
B: PIPs
Sx of acute gout arthritis attack
- SEVERE pain
- Redness/swelling in a joint
- involves 1st MTP (podagra)- can be in others
- Abrupt onset (during night or early morning)
- Max sx reached w/in 12-24 hrs
- sx resolve in few day sto several weeks - quicker if txed
PE signs of acute gout arthritis attack
- Edema
- erythema/warmth
- VERY TENDER
- May extend beyond the joint and mimic cellulitis
Describe gout intervals (intercritical)
“Between attacks”
Occurs with resolution of the acute attack
If untreated:
- Next episode usually occurs within two years
- Usually more prolonged, less intervals between flares, more severe
What is Chronic tophaceous
Collection of MSU crystals surrounded by grandulomatous inflammation
-develop w/in 10 yrs after onset of gout
*prevented by txing gout
Sx of chronic tophaceous
- Can come out of the skin and expel a white, chalky material
- typically NOT painful
- found in joint and skin
Sx of pseudogout
- mimics gout but less painful** and takes longer to reach intensity
- MC Joints: knees, triangular fibrocartilage of wrist
- can be seen in elbows, shoulders, ligaments, tendons, bursa
- acute attacks of synovitis
PE signs of pseudogout
- Redness/ warmth,
- swelling
- limited range of motion and
- tenderness in affected joint
- Looks like cellulitis!
What lab findings do you get with OA
-
No specific test used for diagnosis
1. Can get WEIGHT BEARING X-rays (hip, ankles, knees)**
2. Lab tests used to rule-out secondary causes of OA (Involve a rheumatologist!)
3. +/- Synovial fluid
What does synovial fluid analysis look like for OA?
- Normal viscosity, glucose
- Minimal elevated WBCs (<2000/mm3)
- Negative culture
- Negative crystals
Normal cell count, culture. No crystals
Common Xray findings w/ OA
- Joint space narrowing
- Osteophytes
- Subchondral cysts
- Subchondral sclerosis