Three-Dimensional Analysis of the First Metacarpal Axes in Healthy Individuals and Early-Stage Thumb Carpometacarpal Osteoarthritis Patients—Potential Implication on First Metacarpal Corrective Osteotomy

TY - JOUR

T1 - Three-Dimensional Analysis of the First Metacarpal Axes in Healthy Individuals and Early-Stage Thumb Carpometacarpal Osteoarthritis Patients—Potential Implication on First Metacarpal Corrective Osteotomy

AU - Keller, Marco

AU - Rueegg, Jasmine

AU - Haefeli, Mathias

AU - Honigmann, Philipp

N1 - Publisher Copyright: © 2024 by the authors.

PY - 2024/9

Y1 - 2024/9

N2 - Background: Numerous anatomical features of the first carpometacarpal (CMC I) joint have been investigated as potential predispositions for CMC I osteoarthritis (OA). Even though load transmission through the CMC I joint—and, therefore, the development of osteoarthritis—is believed to be influenced by the geometry of the first metacarpal (MC I) bone, there is no common definition of the MC I axes. Methods: CT scans of twenty healthy volunteers and pre- and postoperative CT scans of six patients with CMC I OA undergoing Wilson osteotomy were analyzed. We proposed a calculation method based on anatomical landmarks for the proximal joint surface axis (PA) angle and the definition of an anatomical (AA) and a mechanical (MA) longitudinal axis. We hypothesized that for an MC I extension osteotomy to be effective, the AA and MA need to be aligned surgically. Results: To align AA and MA, an average correction angle of 22.60° (SD 2.53°) at 1 cm and 26.73° (SD 2.55°) at 1.5 cm distal to the CMC I joint line is required. Conclusions: The hereby proposed method for patient-specific calculation of the correction can be used to improve the surgical technique.

AB - Background: Numerous anatomical features of the first carpometacarpal (CMC I) joint have been investigated as potential predispositions for CMC I osteoarthritis (OA). Even though load transmission through the CMC I joint—and, therefore, the development of osteoarthritis—is believed to be influenced by the geometry of the first metacarpal (MC I) bone, there is no common definition of the MC I axes. Methods: CT scans of twenty healthy volunteers and pre- and postoperative CT scans of six patients with CMC I OA undergoing Wilson osteotomy were analyzed. We proposed a calculation method based on anatomical landmarks for the proximal joint surface axis (PA) angle and the definition of an anatomical (AA) and a mechanical (MA) longitudinal axis. We hypothesized that for an MC I extension osteotomy to be effective, the AA and MA need to be aligned surgically. Results: To align AA and MA, an average correction angle of 22.60° (SD 2.53°) at 1 cm and 26.73° (SD 2.55°) at 1.5 cm distal to the CMC I joint line is required. Conclusions: The hereby proposed method for patient-specific calculation of the correction can be used to improve the surgical technique.

KW - (Wilson) extension osteotomy

KW - first carpometacarpal joint

KW - first metacarpal axis

KW - ligamentoplasty

KW - osteoarthritis

KW - trapeziometacarpal joint

UR - https://www.scopus.com/pages/publications/85205046796

U2 - 10.3390/jcm13185513

DO - 10.3390/jcm13185513

M3 - Article

C2 - 39337000

AN - SCOPUS:85205046796

SN - 2077-0383

VL - 13

JO - Journal of Clinical Medicine

JF - Journal of Clinical Medicine

IS - 18

M1 - 5513

ER -