Table 1 Characteristics on 1756 cases of ankle fracture. Number and proportion of the different classes as well as proportion of elderly patients, women and low energy trauma. 95% CI was calculated using Wilson method
AO class | Number, n (%) | > 65 years | Women | Low energy |
|---|---|---|---|---|
A | 347 (19.8) | 35.2 (30.3–40.3) | 60.2 (55.0–65.2) | 58.8 (53.6–63.9) |
A1 | 243 (13.8) | 36.6 (30.8–42.9) | 67.9 (61.8–73.5) | 64.9 (58.7–70.6) |
A12 | 136 (7.7) | 36.8 (29.1–45.1) | 66.9 (58.6–74.2) | 62.5 (54.1–70.2) |
A13 | 107 (6.1) | 36.4 (27.9–45.9) | 69.2 (59.9–77.1) | 67.9 (58.5–76.1) |
A2 | 91 (5.2) | 31.9 (23.2–42.0) | 40.0 (30.5–50.3) | 43.3 (33.6–53.6) |
A21 | 71 (4.0) | 25.4 (16.7–36.6) | 31.4 (21.8–43.0) | 37.1 (26.8–48.9) |
A22 | 11 (0.6) | 63.6 (35.4–84.8) | 72.7 (43.4–90.3) | 54.5 (28.0–78.7) |
A23 | 9 (0.5) | 44.4 (18.9–73.3) | 66.7 (35.4–87.9) | 77.8 (45.3–93.7) |
A3 | 13 (0.7) | 30.8 (12.7–57.6) | 61.5 (35.5–82.3) | 53.8 (29.1–76.8) |
A31 | 7 (0.4) | 14.3 (2.6–51.3) | 57.1 (25.1–84.2) | 57.1 (25.1–84.2) |
A32 | 2 (0.1) | 50.0 (9.5–90.6) | 50.0 (9.5–90.6) | 100.0 (34.2–100.0) |
A33 | 4 (0.2) | 50.0 (15.0–85.0) | 75.0 (30.7–95.4) | 25.0 (4.6–69.9) |
B | 1162 (66.2) | 36.7 (33.9–39.5) | 60.1 (57.2–62.9) | 72.0 (69.4–74.5) |
B1 | 649 (37.0) | 36.5 (32.9–40.3) | 53.0 (49.2–56.8) | 71.6 (68.1–75.0) |
B11 | 484 (27.6) | 34.7 (30.6–39.1) | 53.9 (49.5–58.3) | 71.1 (66.9–74.9) |
B12 | 145 (8.3) | 42.8 (35.0–50.9) | 49.0 (41.0–57.0) | 73.8 (66.1–80.3) |
B13 | 20 (1.1) | 35.0 (18.1–56.7) | 60.0 (38.7–78.1) | 70.0 (48.1–85.5) |
B2 | 221 (12.6) | 35.7 (29.7–42.3) | 59.7 (53.2–66.0) | 72.4 (66.1–77.9) |
B21 | 96 (5.5) | 26.0 (18.3–35.6) | 46.9 (37.2–56.8) | 74.0 (64.4–81.7) |
B22 | 111 (6.3) | 45.0 (36.1–54.3) | 69.4 (60.3–77.2) | 72.1 (63.1–79.6) |
B23 | 14 (0.8) | 28.6 (11.7–54.7) | 71.4 (45.3–88.3) | 64.3 (38.8–83.7) |
B3 | 292 (16.6) | 37.7 (32.3–43.3) | 76.0 (70.8–82.4) | 72.6 (67.2–77.4) |
B31 | 100 (5.7) | 32.0 (23.7–41.7) | 65.0 (55.3–73.6) | 72.0 (62.5–79.9) |
B32 | 156 (8.9) | 42.3 (34.8–50.2) | 80.8 (73.9–86.2) | 71.2 (63.6–77.7) |
B33 | 36 (2.1) | 33.3 (25.6–55.3) | 86.1 (71.3–93.9) | 80.6 (65.0–90.3) |
C | 189 (10.6) | 25.4 (19.6–32.1) | 48.7 (41.7–55.8) | 62.4 (55.4–69.0) |
C1 | 95 (5.4) | 29.5 (21.3–39.3) | 56.8 (46.8–66.3) | 64.2 (54.2–73.1) |
C11 | 61 (3.5) | 29.5 (19.6–41,9) | 54.1 (41.7–66.0) | 70.5 (58.1–80.4) |
C12 | 5 (0.3) | 60.0 (23.1–88.2) | 60.0 (23.1–88.2) | 60.0 (23.1–88.2) |
C13 | 29 (1.7) | 24.1 (12.2–42.1) | 62.1 (44.0–77.3) | 51.7 (34.4–68.6) |
C2 | 59 (3.4) | 18.6 (10.7–30.4) | 47.5 (35.3–60.0) | 59.3 (46.6–70.9) |
C21 | 22 (1.3) | 9.1 (2.5–27.8) | 31.8 (16.4–52.7) | 59.1 (38.7–76.7) |
C22 | 8 (0.5) | 37.5 (13.7–69.4) | 50.0 (21.5–78.5) | 37.5 (13.7–69.4) |
C23 | 29 (1.7) | 20.7 (9.8–38.4) | 58.6 (40.7–74.5) | 65.5 (47.6–80.1) |
C3 | 35 (2.0) | 25.7 (14.1–42.1) | 28.6 (16.3–45.1) | 62.9 (46.3–76.8) |
C31 | 18 (1.0) | 27.8 (12.5–50.9) | 22.2 (8.5–43.3) | 61.1 (38.6–79.7) |
C32 | 3 (0.2) | 33.3 (6.15–79.2) | 0.0 (0.0–56.2) | 0.0 (0.0–56.2) |
C33 | 14 (0.8) | 21.4 (7.6–47.6) | 42.9 (21.4–67.4) | 78.6 (52.4–92.4) |
Unclassified | 58 (3.3) | 20.7 (12.3–32.8) | 43.6 (31.4–56.7) | 67.3 (53.8–78.5) |
Total | 1756 (100.0) | 34.6 (32.4–36.8) | 58.4 (56.1–60.7) | 68.2 (66.0–70.4) |