Editorial on: “Superion^® InterSpinous Spacer Treatment of Moderate Spinal Stenosis: 4-year Results”

Nunley et al. must be commended for the effort they are currently putting in following-up, since 5 years by now, a cohort of patients treated with Superion implant (1). Originally, the study compared the results of this device with those of the X-Stop. Due to the recall of the X-Stop from the market and the unavailability of patients treated with this device, the authors were obliged to present the data about the Superion without any control.