COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS

Mei Yen Liew; Jeremy Mortimer; Jennifer Paxton; Stephen Tham; Philippa Rust

doi:10.1302/1358-992X.2021.2.032

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COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS

The British Orthopaedic Research Society (BORS) Annual Meeting 2020, held online, 7–8 September 2020.

Mei Yen Liew
Jeremy Mortimer
Jennifer Paxton
Stephen Tham
Philippa Rust

COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS

Liew MY, Mortimer J, Paxton J, Tham S, Rust P. COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS. Orthop Procs. 2021;103-B(SUPP_2):32-32. doi:10.1302/1358-992X.2021.2.032

Liew, Mei Yen, et al. “COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS.” Orthopaedic Proceedings, vol. 103-B, no. SUPP_2, 2021, pp. 32-32., https://doi.org/10.1302/1358-992X.2021.2.032

Liew, M. Y., Mortimer, J., Paxton, J., Tham, S., & Rust, P. (2021). COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS. Orthopaedic Proceedings, 103-B(SUPP_2), 32-32. https://doi.org/10.1302/1358-992X.2021.2.032

Liew, M. Y., Mortimer, J., Paxton, J., Tham, S. and Rust, P. (2021) “COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS.” Orthopaedic Proceedings, 103-B(SUPP_2), pp. 32-32. Available at: https://doi.org/10.1302/1358-992X.2021.2.032

Liew, Mei Yen, Jeremy Mortimer, Jennifer Paxton, Stephen Tham, and Philippa Rust. “COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS.” Orthopaedic Proceedings 103-B, no. SUPP_2 (2021): 32-32. https://doi.org/10.1302/1358-992X.2021.2.032

Liew MY, Mortimer J, Paxton J, Tham S, Rust P. COMPARISON OF HISTOMORPHOLOGICAL DIFFERENCES BETWEEN THE SUBREGIONS OF THE SCAPHOLUNATE INTEROSSEOUS LIGAMENT AND INVESTIGATION OF ITS ENTHESIS. Orthop Procs. 2021 Mar 1;103-B(SUPP_2):32-32. https://doi.org/10.1302/1358-992X.2021.2.032

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Abstract

Objectives

The scapholunate interosseous ligament (SLIL) has a unique C-shape following the arc of the scaphoid and lunate surfaces from distal dorsal around to distal volar. This ligament comprises of three subregions: dorsal, proximal and volar. The SLIL enthesis, a specialized region where this ligament attaches to the scaphoid and lunate, has not previously been studied despite its important mechanical function in the biomechanics of the wrist joint. This study therefore aims to compare the histomorphological differences between the SLIL subregions, including at their entheses. This study will examine the qualitative and quantitative differences between the three subregions, as well as between the scaphoid and lunate attachments.

Methods

Twelve fresh-frozen human cadaveric wrists were dissected and the gross dimensions of each SLIL subregion measured. Subregions were then histologically processed for qualitative and quantitative morphological and compositional analyses, including quantification of enthesis calcified fibrocartilage (CF) area.

Results

From the gross measurements taken, the dorsal subregion was the thickest. There were no significant differences in lengths and widths between the three subregions. Qualitatively, the dorsal and volar subregions had fibrocartilaginous entheses while the proximal subregion inserted into cortical bone via articular cartilage. Quantitatively, the dorsal subregion had significantly more CF than the volar subregion. There was no significant difference in the enthesis CF between scaphoid and lunate attachments in the three subregions.

Conclusions

There are significant histomorphological differences between the SLIL subregions. The dorsal subregion has the largest amount of CF, which is consistent with the greater biomechanical force subjected to this subregion compared to the other subregions. This result confirms that the dorsal subregion is the strongest of the three subregions. The similar histomorphology of the ligament at the scaphoid and lunate entheses suggests that similar biomechanical forces are applied to both attachments.