Lunotriquetral ligament properties: A comparison of three anatomic subregions

M. J.P.F. Ritt, A. T. Bishop, R. A. Berger, R. L. Linscheid, L. J. Berglund, K. N. An

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Abstract

The physical attributes of 3 subregions of the lunotriquetral ligament were tested in a computer-controlled multiaxis testing machine using 12 specimens. This allowed measurement of forces, moments, and displacements when ligaments were subjected to distraction, dorsopalmar translation, proximal-distal translation with a 20 N limit, and rotation with a 0.5 Nm limit. After an intact test run, selected subregions were cut randomly. Together with an additional 12 bone-ligament-bone complexes, specimens were tested to failure with servo-hydraulic load at 5 mm/s. The palmar subregion was thickest (2.3 ± 0.3 mm), the dorsal and proximal progressively less. Intact rotational displacement was 35°± 5.1°, dorsopalmar displacement was 1.6 ± 0.4 mm and 1.2 ± 0.5 mm, respectively, proximal-distal displacement was 1.8 ± 0.5 mm and 1.3 ± 0.5 mm, respectively, and distractional displacement was 0.3 ± 0.1 mm. The dorsal subregion provided 62.3% ± 27.1% of the rotational resistance. The palmar subregion resisted 67.3% ± 14.1% of palmar translation, while with dorsal translation both regions resisted equally. Rotational displacement increased 15.3°± 5.6°after dorsal subregion sectioning. The palmar component failure force was 301 ± 36 N; the dorsal, 121 ± 42 N; and the proximal, 64 ± 14 N.

Original languageEnglish (US)
Pages (from-to)425-431
Number of pages7
JournalJournal of Hand Surgery
Volume23
Issue number3
DOIs
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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    Ritt, M. J. P. F., Bishop, A. T., Berger, R. A., Linscheid, R. L., Berglund, L. J., & An, K. N. (1998). Lunotriquetral ligament properties: A comparison of three anatomic subregions. Journal of Hand Surgery, 23(3), 425-431. https://doi.org/10.1016/S0363-5023(05)80460-5