13 results
Approach to Joint Pain

History:
Is the pain from:
	• Joint
	• Adjacent bursa
	• Tendon
	• Ligament
	• Bone
	• Muscle
	• Referred from
present both at rest ... trauma (e.g., meniscal ... e.g., congenital hip ... osteopetrosis, avascular ... approach #workup #differential
Approach to Joint Pain - Diagnostic Framework

1) Chronicity
2) Inflammatory vs Non-Inflammatory
3) Number of Joints Involved

1) Chronicity:
spondyloarthropathies, lupus ... Lyme), reactive arthritis ... Non-bloody: OA, avascular ... - parvovirus, HIV ... approach #workup #differential
Distinguishing between Inflammatory and Degenerative joint disease
Inflammatory Joint Disease
 • Swelling stimulates joint nociceptors -> Pain
nociceptors -> Pain with rest ... in Rheumatoid arthritis ... , Lupus, etc) -> ... affects the knee hip ... > Stiffness is short-lived
Causes of Knee Effusions - Differential Diagnosis Framework

Knee Effusion Red Flags:
1. Fever/Chills/Joint pain/Night sweats/Weight loss
	- DDX:
		-
Knee Effusions - Differential ... Fever/Chills/Joint ... Seronegative Reactive Syndrome ... Ligamentous injuries - Meniscal ... diagnosis #msk #physicalexam
Leg Pain - Differential Diagnosis Framework

Bone/Joint Causes of Leg Pain:
 • Fracture
 • Arthritis
 • Gout/pseudogout
Leg Pain - Differential ... • Arthritis ... Herpes zoster - HIV ... #Leg #pain #differential ... extremity #msk #physicalexam
SLE (Systemic Lupus Erythematosus)

Suspect:
Clinical evidence of (fatigue, rash, photosensitivity, inflammatory arthritis, weight loss, and fever) and
, inflammatory arthritis ... permanent alopecia Differential ... Joint pain • Swan ... arthropathy • 90% joints ... • Malar rash - spares
Differential Diagnosis of Acute Arthritis

Crystal-induced arthritis: Calcium oxalate, gout, cholesterol, pseudogout, hydroxyapatite crystals

Infectious arthritis: Bacteria, fungi,
Differential Diagnosis ... : Behçet syndrome ... sarcoid, systemic lupus ... : Amyloidosis, avascular ... hyperlipoproteinemia,* meniscal
Vasculitis and Vasculitides - Differential Diagnosis Framework

When to Consider Vasculitis:
 • Purpura, ischemic skin lesions
 •
inflammation Others: • Lupus ... eruption - Joints ... such as systemic lupus ... retinopathy Lab Tests ... Cryoglobulins • HIV
Causes of Petechial Rash - Differential Diagnosis Algorithm

Pinpoint areas (less than 2 mm) of hemorrhage, which
Petechial Rash - Differential ... Disruptions in vascular ... Autoimmune Vasculitis (lupus ... Fecal occult blood test ... #dermatology #physicalexam
Allopecia - Differential Diagnosis Framework for Hair Loss

Localized / Focal Hair Loss Pattern:
 • Scarring Alopecia:
Allopecia - Differential ... Disease: Discoid lupus ... Scarring Alopecia: Lupus ... , Loose anagen syndrome ... texture at bald spots