Intramuscular Tendon of the Adductor Pollicis and Underlying Capsule of the Metacarpophalangeal Joint: An Anatomical Study With Possible Implications for the Stener Lesion

• Published in: The Journal of hand surgery (American ed.) Vol. 43; no. 7; pp. 682.e1 - 682.e8
• Main Authors: Sato, Tetsuya, Nimura, Akimoto, Yamaguchi, Reiko, Fujita, Koji, Okawa, Atsushi, Akita, Keiichi
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.07.2018
• Subjects: Aged, 80 and over; Cadaver; Collateral Ligament, Ulnar - anatomy & histology; Collateral Ligament, Ulnar - diagnostic imaging; Female; Humans; Imaging, Three-Dimensional; Injury; Joint Capsule - anatomy & histology; Joint Capsule - diagnostic imaging; Male; metacarpophalangeal joint; Metacarpophalangeal Joint - anatomy & histology; Metacarpophalangeal Joint - diagnostic imaging; Stener lesion; Tendons - anatomy & histology; Tendons - diagnostic imaging; thumb; Thumb - anatomy & histology; Thumb - diagnostic imaging; ulnar collateral ligament; X-Ray Microtomography; metacarpophalangeal joint; ulnar collateral ligament; thumb; Injury; Stener lesion
• ISSN: 0363-5023; 1531-6564
• DOI: 10.1016/j.jhsa.2017.12.009

To identify the layered relationship anatomically between the musculotendinous structures of the adductor pollicis, the ulnar collateral ligament, and the capsule of the metacarpophalangeal joint in terms of understanding the pathomechanism of a Stener lesion. We macroscopically analyzed 37 cadaveric thumbs to identify the intramuscular tendon of the adductor pollicis and bony attachments of the joint capsule including the ulnar collateral ligament. In addition, we histologically analyzed 3 thumbs and made a 3-dimensional image of 3 other thumbs, using micro-computed tomography. The adductor pollicis has 3 components of an intramuscular tendon (dorsal, palmar, and distal), which connect to form a lambda shape. The dorsal part inserts into the joint capsule dorsal to the ulnar sesamoid. The palmar part inserts into the ulnar sesamoid. The distal part inserts into the lateral tubercle of the proximal phalanx. The thickened and cord-like part of the joint capsule, which has generally been referred to as the proper ulnar collateral ligament, has a distinct bony attachment on the proximal slope of the lateral tubercle of the proximal phalanx separate from the adductor pollicis insertion. Of the 3 components of the intramuscular tendon of the adductor pollicis muscle, the dorsal part inserted into not only the aponeurosis but also the joint capsule. The results of the current study suggest the anatomic basis for a possible pathomechanism of the Stener lesion.