Fig. 1From: Radiographic and clinical outcomes of C1-C2 intra-articular screw fixation in patients with atlantoaxial subluxationThe C1-C2 intra-articular screw. The interference screw that was inserted into the atlantoaxial joint had a hollow structure, which allowed a guidewire to be inserted through it. It measured 5.6 or 6.5Â mm in diameter and 8 or 10Â mm in lengthBack to article page