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9. The multidirectional roles of the anterior oblique ligament and dorsoradial ligament of the thumb carpometacarpal joint.

Author

Kalshoven, Josephine M., Badida, Rohit, Morton, Amy M., Molino, Janine, Weiss, Arnold‐Peter C., Ladd, Amy L., and Crisco, Joseph J.

Subjects
CARPOMETACARPAL joints, MUSCULOSKELETAL system, LIGAMENTS, BIOMECHANICS, THUMB
Abstract

The multidirectional biomechanics of the thumb carpometacarpal (CMC) joint underlie the remarkable power and precision of the thumb. Because of the unconfined nature of thumb CMC articulation, these biomechanics are largely dictated by ligaments, notably the anterior oblique ligament (AOL) and the dorsoradial ligament (DRL). However, the rotational and translational stabilizing roles of these ligaments remain unclear, as evidenced by the variety of interventions employed to treat altered pathological CMC biomechanics. The purpose of this study was to determine the effects of sectioning the AOL (n = 8) or DRL (n = 8) on thumb CMC joint biomechanics (rotational range‐of‐motion [ROM] and stiffness, translational ROM) in 26 rotational directions, including internal and external rotation, and in eight translational directions. Using a robotic musculoskeletal simulation system, the first metacarpal of each specimen (n = 16) was rotated and translated with respect to the trapezium to determine biomechanics before and after ligament sectioning. We observed the greatest increase in rotational ROM and decrease in rotational stiffness in flexion directions and internal rotation following DRL transection and in extension directions following AOL transection. The greatest increase in translational ROM was in dorsal and radial directions following DRL transection and in volar directions following AOL transection. These data suggest the AOL and DRL play complementary stabilizing roles, primarily restraining translations in the direction of and rotations away from the ligament insertion sites. These findings may inform future interventions or implant designs for pathological CMC joints. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Personal Finance

Author

Wei, David and Weiss, Arnold-Peter C.

Abstract

The authors provide a simple primer for hand surgeons to further educate themselves on the basics of investing, tax reduction strategies that are completely legal, insurance protection, especially in your formative years, and unusual options available for further consideration. There are many ways for further education including publications related to finance, investment clubs of like-minded individuals, mentors that have extensive experience in these areas, and formal courses sponsored by business schools or other venues. The opportunities and regulatory environment are ever-changing, so one needs to constantly keep up with taxation rules and newer investment options.

Published
2024
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