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. 2023 Jul 28;13(2):176-180.
doi: 10.1055/s-0043-1771439. eCollection 2024 Apr.

The Medial Triquetrohamate Portal: A New Portal in Wrist Arthroscopy. Anatomical Study

Francisco J Lucas  1 , Vicente Carratalá  1 , Ignacio Miranda  2 , Sergio Pombo Alonso  1
Affiliations

The Medial Triquetrohamate Portal: A New Portal in Wrist Arthroscopy. Anatomical Study

Francisco J Lucas et al. J Wrist Surg. .

Abstract

Introduction Continuing advances in wrist arthroscopy and better understanding of carpal conditions have created the need to design new wrist access portals that facilitate the implementation of new surgical techniques. The aim of this study was to define and verify the safety of the medial triquetrohamate (MTH) portal. Description of the technique The MTH portal is located about 5-10 mm ulnar and 2-3 mm distal to the midcarpal ulnar portal, ulnar to the extensor digitorum communis (EDC) tendon of the fourth and fifth fingers, and radial to the extensor digiti quinti (minimi) (EDQ) tendon. Methods An anatomical study was performed on 15 upper limb specimens from 15 human cadavers. Iatrogenic injuries to potentially at-risk neurovascular and tendinous structures were assessed, and the distance from the portal to these structures was measured. Results There were no iatrogenic injuries to the structures at risk. Mean distances from the MTH portal to the EDC tendon of the fourth and fifth fingers and to the EDQ tendon were 4.67 ± 0.35 mm and 7.27 ± 0.18 mm, respectively. No differences were observed between the left and right wrists. The distance from the MTH portal to the dorsal sensory branch of the ulnar nerve was 15.07 ± 0.44 mm. The structure with the highest risk of injury was the EDC tendon of the fourth and fifth fingers, with a distance of less than 5 mm. Conclusions The MTH portal is safe, reproducible and facilitates the implementation of various techniques related to midcarpal pathology.

Keywords: medial triquetrohamate portal; midcarpal joint; wrist arthroscopy.

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Conflict of interest statement

Conflict of Interest None declared.

Figures

Fig. 1
Fig. 1
Anatomical references for the MTH portal in an arthroscopic procedure. 3-4 portal, 6-R portal, MC-R: Midcarpal radial portal, MCU: Midcarpal Ulnar portal. EDC: Extensor digitalis comunis, EDM: Extensor Digiti Minimi, LT: Lister Tubercle.
Fig. 2
Fig. 2
Anatomical dissection of the dorsal wrist. Dorsal view. ( a ) EDC tendon of the fourth and fifth fingers; ( b ) Medial Triquetrohamate portal; ( c ) EDQ tendon and ( d ) Dorsal sensory branch of the ulnar nerve.
Fig. 3
Fig. 3
Anatomical dissection of the dorsal wrist. Ulnar view. ( a ) EDC tendon of the fourth and fifth fingers; ( b ) Medial Triquetrohamate portal; ( c ) EDQ tendon and ( d ) Dorsal sensory branch of the ulnar nerve.
Fig. 4
Fig. 4
Arthroscopic view of the establishment of the medial triquetrohamate portal (MTH). (TQ) Triquetrum bone. (SL) Lunate bone; (CP) Capitate bone; Lunotriquetral ligament (LTL).
Fig. 5
Fig. 5
Arthroscopic view from the radial midcarpal portal. Use of the MTH portal in a volar lunotriquetral capsulodesis. (TQ) Triquetrum bone. (SL) Lunate bone; (CP) Capitate bone; Lunotriquetral ligament (LTL).
See this image and copyright information in PMC

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