orthopedic pathology (joint pathologies) Flashcards
joint pathologies
..
types
degenerative
(Osteoarthritis)
inflammatory
(Reumatoid arthritis, Ankylosing spondylitis, Psoriatic arthritis)
metabolic
(Gout, pseudogout)
infectious
(Septic arthritis)
neurogenic
(Charcot’s arthropathy)
OA, aka
DJD
abut OA
Chronic, degenerative condition that affects joints, specifically articular cartilage and subchondral bone
what structure particularly affet
articular cartilage
subchondral bone
prealance increaes with
age
MOST COMMON JOINT DISORDER IS???
OA
primary vs seconary OA
Primary OA – idiopathic
Secondary OA – to joint trauma, infection, hemarthrosis, osteonecrosis, etc.
primary OA
MOST COMMON
via regualr wear/tear
caused by the breakdown of cartilage
secondary OA
caused by another disease, infection, injury, or deformity. Osteoarthritis starts with the breakdown of cartilage in the joint.
seconary via
joint trauma, infection, hemarthrosis, osteonecrosis, etc.
also eg
RA cause OA (?)
risk factors OA
joint immobilization
jint immobilziatson oa
Conclusions. Joint immobilization caused multiple OA-like lesions in both mice and humans. Joint immobilization induced progressive sensory innervation, synovitis, osteophyte formation, and cartilage loss in mice, which can be partially ameliorated by remobilization.
other isk fators
Altered biomechanics – developmental deformities; Genu valgum/varus
Immobilization
Trauma
Pathology
Genetics – familial forms of some hand OA
Gender – mc in women over age 50
Lifestyle- obesity (high correlation w/ knee OA and even hand OA)
Low vitamin D and Vitamin C intake are associated with increased risk of knee OA progression
which vitamin definicency, OA
Low vitamin D and Vitamin C intake
knee OA progression
OA define
can be defined as a gradual loss of articular cartilage, combined with thickening of the subchondral bone, bony outgrowths (osteophytes) at joint margins, and mild, chronic nonspecific synovial inflammation.
other features of oa
osteophytes (exostosis)
nonsepcific synovial infalmation
OA part of
aging
can you distinguish bw oa and aging
3 states identified
normal cartiage –> aginng cartilage –> OA cartilage
pathogeneiss OA
Phase 1: Edema and Microcracks
Edema of the extracellular matrix
Cartilage loses its smooth aspect and microcracks begin to appear
Cartilage softens and thins
Loss of joint space
There is a focal loss of chondrocytes
Unable to repair as normal
phase 2
Phase 2: Fissuring and Pitting
Microcracks deepen perpendicularly in the direction of tangential forces and along collagen fibers
Vertical clefts form in the cartilage above the subchondral bone
phase 3
Phase 3: Erosion
Fissures cause fragments of cartilage to detach off; causing:
Osteocartilaginous loose bodies
—> Synovial inflammation (often more focal than inflammation occurring due to rheumatoid synovitis)
—> Inflammation caused synovial hypertrophy and capsular thickening
Uncovering subchondral bone:
—> Sclerosing of subchondral bone
—> Subchondral cysts
—> Osteophyte formation
Dx oA
History
Physical exam
Lab tests
X-ray
Sx
Pain is the cardinal symptom of OA and is the major determinant of disability and functional impairment
Pain is not always present in patients with radiographic findings
Degree of radiographic findings does not always correlate with clinical symptoms