Official Journal of the Italian Society of Orthopaedics and Traumatology
Table 5 Analysis of measurement variability
Measurement area | Range of data | Mean ± SD | 95% CI |
|---|---|---|---|
1. The distance from the medial condyle to the base of the coronal fossa (cm) | 1.07–1.53 | 1.31 ± 0.175 | 1.21–1.41 |
2. The vertical distance from the vertex of the medial epicondyle to the median nerve (cm) | 2.30–3.40 | 2.96 ± 1.62 | 2.79–3.14 |
3. The length of the humerus (cm) | 27.0–32.5 | 29.22 ± 1.62 | 28.24–30.2 |
4. The distance from the medial epicondyle to the lateral epicondyle of the humerus (cm) | 5.2–6.78 | 6.15 ± 0.56 | 5.81–6.48 |
5. The distance from the vertex of the epicondyle to the intersection of the median nerve and the distal end of the underlying steel plate (cm) | 5.70–6.90 | 6.28 ± 0.39 | 6.05–6.52 |
6. The distance from the medial base of the humeral head to the intersection of the median nerve and the proximal end of the underlying steel plate (cm) | 7.00–10.60 | 8.88 ± 0.96 | 8.30–9.47 |
7. Located on the medial epicondyle, the distances between the tips of the bicortical screws and the ulnar nerve, which is crossed by the distal end of the plate with four screws (mm) | |||
(1). First distal screw of the plate | 0.00–4.00 | 1.70 ± 1.25 | 0.94–2.45 |
(2). Second distal screw of the plate | 4.00–10.00 | 7.00 ± 1.91 | 5.84–8.16 |
(3). Third distal screw of the plate | 10.00–18.00 | 14.23 ± 1.88 | 13.10–15.37 |
(4). Fourth distal screw of the plate | 18.00–23.00 | 20.00 ± 1.47 | 19.11–20.89 |
8. Distances between the olecranon fossa and the tips of the four screws at the distal end of the plate in the medial humeral epicondyle (mm) | |||
(1). First distal screw of the plate | 0.00–12.00 | 6.85 ± 3.31 | 4.84–8.84 |
(2). Second distal screw of the plate | 0.00–3.00 | 1.31 ± 1.03 | 0.68–1.93 |
(3). Third distal screw of the plate | 0.00–7.00 | 0.69 ± 1.93 | −0.47–1.85 |
(4). Fourth distal screw of the plate | 1.00–10.00 | 6.23 ± 2.68 | 4.61–7.85 |