Characteristics of patients with IMN removed because of symptomatology*
| Characteristic | IMN status; no. (and %)† | p value | |
|---|---|---|---|
| Removed 29 fractures (29 pts) | Not removed 92 fractures (90 pts) | ||
| Overall rate,% (ratio) | 23.97 (29/121) | ||
| Time, mean (range) mo | 25.19 (5.29–77.62) | ||
| Age, mean (range) y | 33.8 (17.1–68.6) | 37.2 (17.0–70.8) | p = 0.37 |
| Sex | p ≤0.05 χ2 = 4.50 | ||
| Male | 15 (51.7) | 67 (72.8) | |
| Female | 14 (48.3) | 25 (27.2) | |
| Weight, mean (range) kg | 72 (52–91) | 77 (50–115) | p = 0.07 |
| Height, mean (range) m | 1.71 (1.55–1.88) | 1.74 (1.46–1.91) | p = 0.15 |
| BMI, mean (range) kg/m2 | 24.35 (19.31–32.47) | 24.4 (16.98–40.75) | p = 0.17 |
| Age groupings, y | p ≤1 χ2 = 3.01 | ||
| 15–30 | 15 (11.26) | 32 (35.74) | |
| 31–49 | 11 (12.70) | 42 (40.30) | |
| 50–70 | 3 (5.03) | 18 (15.97) | |
| Locking bolt only and sex | p ≤1 χ2 = 1.09 | ||
| Male | 7 (8.53) | 67 (65.46) | |
| Female | 5 (3.46) | 25 (26.54) | |
| Entire IMN and sex | p ≤0.05 χ2 = 4.44 | ||
| Male | 8 (11.70) | 67 (63.30) | |
| Female | 9 (5.30) | 25 (28.70) | |
| Fracture location | p ≤1 χ2 = 0.96 | ||
| Proximal 1/3 | 2 (1.44) | 4 (4.56) | |
| Middle 1/3 | 12 (14.14) | 47 (44.86) | |
| Distal 1/3 | 15 (13.42) | 41 (42.58) | |
| WCB | p ≤1 χ2 = 0.47 | ||
| Claim involved | 3 (2.16) | 6 (6.84) | |
| Claim not involved | 26 (26.84) | 86 (85.16) | |
| Insurance | p ≤1 χ2 = 0.03 | ||
| Claim involved | 8 (8.39) | 27 (26.61) | |
| Claim not involved | 21 (20.61) | 65 (65.39) | |
| Litigation | p ≤0.01 χ2 = 8.21 | ||
| Litigation involved | 13 (7.19) | 17 (22.81) | |
| Litigation not involved | 16 (21.81) | 75 (69.19) | |
| Level of activity/employment | p ≤1 χ2 = 0.67 | ||
| Sedentary/light | 17 (15.10) | 46 (47.90) | |
| Moderate | 6 (7.19) | 24 (22.81) | |
| Heavy | 6 (6.71) | 22 (21.29) | |
| Diameter of IMN, mm | p = 0.23 | ||
| Average | 9.97 | 10.283 | |
| 8–9 | 10 (7.43) | 21 (23.57) | p ≤1 χ2 = 1.75 |
| 10 | 8 (8.14) | 26 (25.85) | |
| 11–13 | 11 (13.42) | 45 (40.30) | |
| Obese v. nonobese | p ≤1 χ2 = 0.03 | ||
| Obese (BMI > 25) | 12 (12.46) | 40 (39.54) | |
| Nonobese (BMI < 25) | 17 (16.54) | 52 (52.46) | |
| Mechanism of injury | p ≤0.20 χ2 = 1.93 | ||
| High energy | 9 (12.22) | 42 (38.78) | |
| Low energy | 20 (16.76) | 50 (53.22) | |