Table 4 Results grouped by the timing of MRI after surgery
MRI years after surgery | |||||
|---|---|---|---|---|---|
Parameter | 0.5 years (n = 1) | 1–2 years (n = 7) | 2–3 years (n = 4) | 3–4.5 years (n = 6) | |
Full visualization of the screw integrity | 1/1 | 0/7 | 0/4 | 0/6 | |
Tissue in the screw canals (> 90% of the canals) | Fluid | 0/1 | 5/7 | 0/4 | 0/6 |
Mix | 1/1 | 2/7 | 0/4 | 1/6 | |
Solid bone | 0/1 | 0/7 | 4/4 | 5/6 | |
Edema in the bone adjacent to the screw canals | 0/1 | 0/7 | 0/4 | 0/6 | |
Other MRI signal in the bone adjacent to the screw canals (e.g. fat signal) | 0/1 | 3/7 | 1/4 | 1/6 | |
Intraosseous cysts adjacent to the screw canals | 0/1 | 1/7 | 1/4 | 1/6 | |
Metal particle artefacts in relation to the screw canals | 0/1 | 6/7 | 3/4 | 3/6 | |
Edema adjacent to the screw insertion site | 1/1 | 0/7 | 0/4 | 0/6 | |
Ectopic bone formation | 0/1 | 0/7 | 0/4 | 0/6 | |