An association between lunate morphology and scaphoid-trapezium-trapezoid arthritis.
The purpose of this study was to determine if an association exists between scaphoid-trapezium-trapezoid arthritis and lunate morphology. Plain neutral posteroanterior radiographs were evaluated for 48 patients with STT arthritis and 96 patients from a control group. Lunate type was determined using capitate-triquetrum (C-T) distance. A type I lunate was defined as a C-T distance < or =2 mm. A type II lunate was defined as a C-T distance > or =4 mm. Lunate type was recorded and compared between those with STT arthritis and a control group. The groups were similar with regard to age, gender and handedness. Type II lunates were found in 83% of cases with STT arthritis and in 64% of controls. STT OA was associated with type II lunate wrists (P = 0.02; OR = 0.35; CI: 0.15-0.82). We postulate that variations in scaphoid motion secondary to lunate morphology may contribute to the development of STT OA.
Discipline of Orthopaedics and Trauma, The University of Adelaide, Adelaide, Australia.
J M
JM
McLean
P C
PC
Turner
G I
GI
Bain
N
N
Rezaian
J
J
Field
Q
Q
Fogg
D000368:Aged; D000369:Aged, 80 and over; D050824:Carpal Joints / Q000000981:diagnostic imaging / Q000503:physiopathology; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D012667:Lunate Bone / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000503:physiopathology*; D011859:Radiography; D021361:Scaphoid Bone / Q000000981:diagnostic imaging / Q000503:physiopathology*; D051222:Trapezium Bone / Q000000981:diagnostic imaging / Q000503:physiopathology*; D051223:Trapezoid Bone / Q000000981:diagnostic imaging / Q000503:physiopathology*