Fig. 2

X-ray imaging of implant position in the SI-screw fixation group with anterior fixation (SI +) (a–c) and in the SI-screw fixation group without anterior fixation (SI−) (d–f) and the ring fixator group (RingFix) (g–i) in ap (a, d, g), inlet (b, e, h) and outlet-projection (c, f, i).