Four-corner arthrodesis using the Quad memory staple.

Range of motion, pain, consolidation and complications were evaluated for nine patients who underwent four-corner arthrodesis using the Quad Memory Staple (QMS) at a mean follow-up of 44 months. The mean pre-operative range of motion was 50 degrees extension, 62 degrees flexion, 9 degrees radial deviation and 24 degrees ulnar deviation. The postoperative range of motion was similar to previous studies at 32 degrees extension, 31 degrees flexion, 15 degrees radial deviation and 20 degrees ulnar deviation. The grip strength was 28 kg pre-operatively and 26 kg postoperatively. The mean pain score improved from 41 to 23 and the Disabilities of Arm, Shoulder, and Hand (DASH) score from 24 to 20. Non-union, haematoma and wound infection were not seen and eventually all four-corner fusions were consolidated. The main advantages of the QMS are its compressive property and the simple fixation technique. It gives good stability, enables early rehabilitation and avoids the risks of pin fixation methods.