DJD in the extremities Cheat Sheet (DRAFT) by Siffi

Asymmetric	Loss of joint space - mostly in superior compar­tment
Osteophyte formation	Subchr­ondal cysts
Subchr­ondral sclerosis	Buttre­ssing (thick­ening of the medial aspect of femoral head)
Joint deformity

Severe medial hip migration	Remodeled acetabulum
Kohler's line reduced	Otto's pelvis - Bilateral, RA
DDx	OA, RA, bone softening, Paget's disease, Osteom­alacia
	Normal Variant in females and coxa profunda

Asymmetric loss of joint space (medial)	Genu Varus (bowing)
Subcho­ndral Sclerosis	Subcho­ndral Cysts
Articular deformity and irregu­larity	Hypert­rophic Changes of the interc­ondylar spines
Enthes­opathy of the anterior non-ar­ticular surface of the patella	Sublux­ation
Intraa­rti­cular loose bodies - clicking and locking of the knee)	Osteop­hytes

- Affects talo-c­rural joint	- Common if previous trauma
Non-un­iform loss of joint space	Sclerosis
Subchr­ondral cyst	Osteop­hytes
Enthes­opathy

Decreased Joint Space	Osteop­hytes
Hallux Valgus	Subcho­ndral sclerosis
Joint Deformity

Not commonly involved without trauma	AC joint involved
Leads to imping­ement + degene­ration of rotator cuff tendons
Findings	Sclerosis
Subcho­ndral cysts	Osteop­hytes
Loose Bodies	Loss of joint space

Locations	DIPs
	PIPs
	1st MC joints - lateral misali­gnment
Herberdens nodes	DIPs

- Inflam­matory	- Gull wing appearance of DIP joints
- Causing pain, redness, swelling and decreased ROM	- Elevated ESR
- Sawtoo­thing & sublux­ation	- Marginal Erosions