Outcomes of "Cross-Coupling Suture Button Suspensionplasty" for Thumb Carpometacarpal Joint Osteoarthritis: A Preliminary Report.

Thumb carpometacarpal joint osteoarthritis is a common condition that is treated nonsurgically. When conservative treatments fail, surgery is considered. Recently, suture button suspensionplasty has attracted attention and yielded good clinical results. We have developed a novel suture button suspensionplasty procedure called "cross-coupling suture button suspensionplasty" (CC-SBS) using a pair of suture button devices after a complete trapeziectomy. This retrospective study aimed to report the short-term clinical results of patients who underwent CC-SBS at our institution. We evaluated 10 hands of 10 patients (9 women and 1 man; average age, 67 years) who were refractory to conservative treatment and underwent CC-SBS at our institution between 2015 and 2017. We evaluated the preoperative Eaton stage and postoperative trapezial space height immediately after surgery and at the final visit; measured the trapezial space height, range of motion of the palmar and radial abduction of the carpometacarpal joint at the final visit; measured the preoperative and postoperative pinch strength; and recorded postoperative complications. The mean trapezial space height was 6.5 mm, and the mean radial and palmar abductions were 47° and 45°, respectively, at the final visit. The average pinch strength improved to 3.8 kg at the final visit compared to that pre-operation. In one case, a second metacarpal fracture occurred 2 weeks post-surgery, but no other complications were reported. Conclusion: CC-SBS showed short-term clinical outcomes similar to those of ligament reconstruction and tendon interposition and demonstrated faster overall recovery. Our procedure does not need a donor tendon for suspension and is technically simple and less invasive than ligament reconstruction tendon interposition. Thus, stronger initial fixation is obtained by using two suture button devices, and rehabilitation can be started from an early stage. We believe that this procedure is a good surgical option for carpometacarpal joint osteoarthritis.