RecruitingPhase 4ProcedureFlex Appeal: Evaluating the Efficacy of Anesthetic Techniques for Manipulation of Knees Under AnesthesiaThe purpose of this study is to determine if changing the type of anesthesia improves the outcomes of manipulation and pain control after the procedure. The study will compare a spinal anesthesia with a general anesthesia, to see if there is a better outcome from either anesthesia type.