PMC5841103_01
(a, b) Radiographs taken at the initial presentation. The trapezium body fracture and radial dislocation of the CMC joint are shown. (c, d) Computed tomography taken at the initial presentation. The collapse of the trapezium articular surface is shown. (a, c: anteroposterior view; b, d: lateral view.)
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fig1
CMC joint (Figures 1(a) and 1(b)). Computed tomography (CT) showed collapse of the trapezium articular surface (Figures 1(c) and 1(d)).
(a, b) Radiographs taken directly after surgery. The collapsed articular surface was elevated, and beta-TCP was used to fill the subchondral bone loss, fixed by K-wire. (c, d) Radiographs taken at final follow-up, 2 years after surgery. A congruent CMC joint and trapezium fracture union is shown; however, a hyperextension of the thumb metacarpophalangeal (MP) joint was revealed. (a, c: anteroposterior view; b, d: lateral view.)
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fig2
The collapsed articular surface was elevated, and beta-tricalcium phosphate (beta-TCP) was used to fill the subchondral bone loss, fixed by K-wire (Figures 2(a) and 2(b)). However, a hyperextension of the thumb metacarpophalangeal (MP) joint, a zigzag deformity, was revealed (Figures 2(c) and 2(d)), which is often seen in thumb CMC joint osteoarthritis.
PMC5841103_02
(a, b) Radiographs taken at the initial presentation. The trapezium body fracture and dorsal dislocation of the CMC joint is shown. (a: anteroposterior view; b: lateral view.)
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fig3
The plain radiograph revealed a trapezium body fracture and dorsal dislocation of the CMC joint (Figures 3(a) and 3(b)).
(a, b) Radiographs taken directly after surgery. Good reduction and fixation were obtained using 2 double-thread headless screws. (c, d) Radiographs taken at final follow-up, a year after surgery. A congruent CMC joint and trapezium fracture union is shown. (a, c: anteroposterior view; b, d: lateral view.)
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fig4
The first and second metacarpals were temporarily fixed by K-wire (Figures 4(a) and 4(b)). Plain radiograph showed a congruent CMC joint and trapezium fracture union (Figures 4(c) and 4(d)).
PMC5841103_03
(a, b) Radiographs taken at the initial presentation. The trapezium body fracture and dorsal dislocation of the CMC joint is shown. (c, d) Reconstructed 3D computed tomography taken at the initial presentation. The split in the trapezium body and articular surface is shown. (a, c: anteroposterior view; b, d: lateral view.)
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fig5
CMC joint (Figures 5(a) and 5(b)). CT revealed a split fracture of the trapezium body (Figures 5(c) and 5(d)).
(a, b) Radiographs taken directly after surgery. Good reduction and fixation were obtained using 2-headless screws. (c, d) Radiographs taken at final follow-up, 6 months after surgery. A congruent CMC joint and trapezium fracture union had been obtained. (a, c: anteroposterior view; b, d: lateral view.)
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fig6
The first and second metacarpals were temporarily fixed by K-wire (Figures 6(a) and 6(b)). Plain radiograph showed a congruent CMC joint and trapezium fracture union (Figures 6(c) and 6(d)).