An association between lunate morphology and scaphoid-trapezium-trapezoid arthritis

J. M. McLean, P C Turner, G. I. Bain, N. Rezaian, J. Field, Q. Fogg

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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 ĝ‰Currency sign2 mm. A type II lunate was defined as a C-T distance ĝ‰¥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.

Original languageEnglish
Pages (from-to)778-782
Number of pages5
JournalJournal of Hand Surgery: European Volume
Issue number6
Publication statusPublished - Dec 2009


  • Arthritis
  • Lunate
  • Morphology
  • Scaphoid-trapezium-trapezoid
  • STT

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