Lunotriquetral Ligament
Description[edit | edit source]
The lunotriquetral joint is stabilized by the lunotriquetral ligament (LTL), a C-shaped ligament that has three components - dorsal, volar and proximal[1][2][3]. It, together with the scapholunate ligament, are the most important wrist interosseous ligaments because they join the proximal surfaces of the proximal carpal row[2]. The volar and dorsal portions are considered true ligaments where the proximal portions are fibrocartilaginous membranes[2]. These proximal portions play no mechanical role[2]. The volar portion is the strongest and most important[2][4]. Compared to scapholunate instability, lunotriquetral instability is less common[2]. The triquetrum and it's ligaments are important for proprioception for neuromuscular wrist stabilization[3].
Attachments[edit | edit source]
Proximal attachment: distal lunate and triangular fibrocartilage[5]
Distal attachment: medial margin for the triquetrum[5]
Function[edit | edit source]
Dorsal portion: limits dorsiflexion between the lunate and triquetrum[5].
Volar portion: largely contributes to carpal stability and also limits triquetral extension[5].
Mechanism of Injury / Pathological Process[edit | edit source]
Isolated LTL injuries can occur when a person falls onto an outstretched arm[1][2] while the wrist is in radial deviation and extension[1]. Repetitive stress can also lead to a LTL injury[2]. For more information regarding LTL injury and lunotriquetral dissociation, please see the lunotriquetral dissociation page.
References[edit | edit source]
- ↑ 1.0 1.1 1.2 Beeker RW, Rehman UH (2022). Carpal Ligament Instability.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Moser T, Khoury V, Harris PG, Bureau NJ, Cardinal E, Dosch JC. MDCT arthrography or MR arthrography for imaging the wrist joint?. InSeminars in musculoskeletal radiology 2009 Mar (Vol. 13, No. 01, pp. 039-054). © Thieme Medical Publishers.
- ↑ 3.0 3.1 Van de Grift TC, Ritt MJ. Management of lunotriquetral instability: a review of the literature. Journal of Hand Surgery (European Volume). 2016 Jan;41(1):72-85.
- ↑ Kang SH, Chae S, Kim J, Lee J, Park IJ. Scapholunate and lunotriquetral interosseous ligament augmentation with internal bracing in perilunate dislocation. Medicine. 2021 Sep 9;100(38).
- ↑ 5.0 5.1 5.2 5.3 Henry Knipe, 2022, Lunotriquetral ligament, Radiopedia, viewed 20/12/22, https://radiopaedia.org/articles/lunotriquetral-ligament?lang=us
