Upper Extremity Variants Flashcards
What is a pseudotumor of the humerus?
mach effect where the greater tuberosity appears as a lytic mass
(NOT a Dx)
What is a supracondylar process?
exostosis proximal to the medial epicondyle, pointing toward the elbow joint
What is the differential diagnosis for a supracondylar process?
pedunculated osteochondroma
(points away from elbow joint)
What is the anomalous soft tissue structure associated with this radiographic diagnosis?
Struthers ligament
(Dx = supracondylar process)
What nerve is most likely affected by a supracondylar process?
median n
What may cause symptoms in a patient with a supracondylar process?
- median neuropathy
- brachial a compromise
- Fx
What is positive ulnar variance?
Ulna is >2mm above the radius
What is the clinical significance of positive ulnar variance?
- ulnar impingement syndrome
- TFCC tear
What is negative ulnar variance?
ulna is >2mm below the radius
What is the clinical significance of negative ulnar variance?
lunate AVN (Keinbock disease)
What is Keinbock disease?
AVN of the lunate
What are the radiographic signs of avascular necrosis?
- sclerosis
- flattening
- fragmentation
What is Madelung deformity?
short bowed radius with DRUJ dislocation due to failure of medial growth at distal radial physis
What is carpal coalition?
congenital fusion of carpal bones
What type of carpal coalition is clinically significant?
involving proximal to distal row can have significant biomechanical results or indicate dysplasia
(just 1 row involved is NOT signif.)
What are the most common types of carpal coalition?
- lunotriquetral
- capitate-hamate
(for lab: just say “carpal coalition”)
What is polydactlyly?
extra fingers/toes/bones
What is syndactlyly?
manifests in the form of fusion of the skin between the digits (syndactlyly) or fusion of the osseous phalanges of adjacent digits (synostosis)
What is symphalangism?
ankylosis/synostosis of the interphalangeal joints in toes or fingers
What is the diagnosis?
Rhomboid fossa
What is the diagnosis?
Rhomboid fossa
What is the diagnosis?
Os acromiale
What is the diagnosis?
Os acromiale
What is the diagnosis?
Supracondylar process
What is the diagnosis?
Proximal radioulnar synostosis
What is the diagnosis?
Madelung deformity
What is the diagnosis?
Proximal radioulnar synostosis
What is the diagnosis?
Madelung deformity
What is the diagnosis?
Enlarged conoid tubercle
What is the diagnosis?
Olecranon foramen
What is the diagnosis?
Negative ulnar variance
What is the diagnosis?
Positive ulnar variance
What is the diagnosis?
Carpal coalition
What is the clinical significance?
None
What is the diagnosis?
Carpal coalition
What is the diagnosis?
Polydactyly
What is the clinical significance?
Significant biomechanical results
(Carpal coalition involving proximal to distal row)
What is the diagnosis?
Syndactyly
What is the diagnosis?
Brachymetacarpy
