Visionaire™ Versus Standard Instrumentation Safety and Efficacy in Total Knee Arthroplasty (TKA)

A Multicenter, Randomized, Clinical Outcome of VISIONAIRE™ Patient Matched Technology vs. Standard Surgical Instrumentation in Total Knee Arthroplasty

The objective of this study is to assess outcomes following TKA, utilizing two surgical techniques. Patients will be randomized to one of two arms: TKA with standard instrumentation and TKA with VISIONAIRE™ patient-matched cutting blocks. Data will be collected at preoperative, operative/discharge, 3 months, 1 year and 2 years after TKA. The secondary objective of this study is to compare the safety, quality of life, and economic outcomes of TKA when these two techniques are utilized. This study does not involve treatment or investigational products, as all components are FDA cleared and are commercially available.

This is a prospective study comparing VISIONAIRE™ to standard TKA instrumentation. The objective of this study is to evaluate the safety and efficacy of TKA using VISIONAIRE™ when compared with standard instrumentation, including device survival, improvement in function and implant alignment after TKA. This study will also document any device-related, surgical complications and/or adverse radiographic observations. In contrast with the control group clinical outcomes following TKA completed with VISIONAIRE™ have yet to be assessed. The current investigation will determine if there is any difference in TKA outcomes when VISIONAIRE™ patient matched technology is utilized versus standard instrumentation. All patients meeting the inclusion/exclusion criteria specified in this protocol will be asked to participate in the study. If the patient consents to participate, they will be enrolled in the study and randomized to one of the two study arms. Patients requiring TKA will be implanted with Legion, Genesis II or Journey BCS (Smith & Nephew) total knee implant systems. Standard instrumentation will be used to assist the surgeon in placing the implant in the control group. In the VISIONAIRE™ group, standard instrumentation will not be used in the surgery. Patients randomized to the VISIONAIRE™ arm will have an MRI preoperatively that will be used to create the customized cutting blocks. All patients will have an x-ray at each postoperative interval.

The KSS was used to rate both the prosthesis function and the patient's functional abilities after TKA. The KSS Total Score (0-100 points) included a combined evaluation of joint motion (0-25 points), instability (0-25 points), alignment (0-25 points), and symptoms (0-25 points). A higher score indicated a better outcome for subjects.

The KSS was used to rate both the prosthesis function and the patient's functional abilities after TKA. The KSS clinical evaluation included a questionnaire completed by the investigators to assess for pain, stability, flexion contracture, extension lag, and alignment and evaluated based on number of subjects experiencing any of these issues at the 2-year postoperative visit.

Evaluation of Mechanical Alignment Assessed as Either Neutral or Varus/Valgus 3 Months Postoperatively Using a Full Leg X-ray

Long radiographic anterior-posterior (AP) (full-leg standing x-rays) of the entire limb are superior for measuring alignment of the knee as the limb mechanical axes may be more precisely computed. For full-leg x-rays, 2 lines were drawn on the radiograph. First, a line was drawn from the center of the femoral head to the center of the femoral intercondylar notch and the line was extended through to the ankle. Second, a line was drawn from the center of the tibial spine to the center of the ankle talus. The angle between the first and second line was measured to determine mechanical alignment and assessed as either neutral (0 degrees) or a number of degrees of varus or valgus.

Evaluation of KOOS questionnaire total scores including categories for symptoms, pain, function of daily living, function of sports and recreational activities, and quality of life. KOOS total scores ranged from 0 to 100, with 0 indicating worst (no function) and 100 indicating no symptoms at all.

Serial Radiographic Evaluations to Assess Evidence of Loosening (Radiolucencies) by Measuring Lucent Zones at 1 Year Postoperatively

X-ray evaluations performed to assess for evidence of implant loosening by radiolucencies (> 2 mm). Anterior-posterior (AP) and lateral serial x-ray evaluations were performed. The span of the bone-prosthesis interface, for each component, was broken down into zone systems. The scoring system for each of the 3 components was determined by measuring the radiolucent lines (mm) for each of these zones.

X-ray evaluations performed to assess for evidence of implant loosening by lack of evidence of surface wear or particulate debris generation, indications of early osteolysis, implant migration, and/or other clinical or radiographic abnormalities. Anterior-posterior (AP) and lateral serial x-ray evaluations were performed.

X-ray evaluations performed to assess for evidence of implant loosening by radiolucencies (> 2 mm), lack of evidence of surface wear or particulate debris generation, indications of early osteolysis, implant migration, and/or other clinical or radiographic abnormalities. Anterior-posterior (AP) and lateral serial x-ray evaluations were performed. The span of the bone-prosthesis interface, for each component, was broken down into zone systems. The scoring system for each of the 3 components was determined by measuring the radiolucent lines (mm) for each of these zones.

X-ray evaluations performed to assess for evidence of implant loosening by lack of evidence of surface wear or particulate debris generation, indications of early osteolysis, implant migration, and/or other clinical or radiographic abnormalities. Anterior-posterior (AP) and lateral serial x-ray evaluations were performed.

Analysis of health data captured during and immediately following surgery: anesthesia time, operative time (skin-to-skin), tray setup, duration of operation, blood loss, incision length, number of instrument trays setup, and number of instrument trays used.

Analysis of health data captured during and immediately following surgery: anesthesia time, operative time (skin-to-skin), tray setup, duration of operation, blood loss, incision length, number of instrument trays setup, and number of instrument trays used.

Analysis of health data captured during and immediately following surgery: anesthesia time, operative time (skin-to-skin), tray setup, duration of operation, blood loss, incision length, number of instrument trays setup, and number of instrument trays used.

Analysis of health data captured during and immediately following surgery: anesthesia time, operative time (skin-to-skin), tray setup, duration of operation, blood loss, incision length, number of instrument trays setup, and number of instrument trays used.

Analysis of health data captured during and immediately following surgery: surgical approach, cut order, final status of posterior cruciate ligament (PCL), and need for perioperative prophylaxis antibiotics.

Inclusion Criteria: Patients must meet all of the inclusion criteria. Patient diagnosed with degenerative arthritis of the knee requiring a unilateral primary TKA. Patient is of legal age to consent and is skeletally mature. Patient is willing to sign and date an ethics-approved consent form. Patient is willing to be available for two-year follow-up postoperatively Exclusion Criteria: Patients must not meet any of the exclusion criteria. Patient is known to have poor bone stock making a TKA unjustifiable. Patient is immuno-suppressed. Patient has physical, emotional or neurological conditions that would compromise the patient's compliance with postoperative rehabilitation and follow-up. Patient is pregnant or may become pregnant during the course of the study. Patient has a history of prior ipsilateral major knee surgery (e.g. arthroplasty, high tibial osteotomy, or tibial plateau fracture). Minor prior procedures such as ACL repair, meniscectomy, or arthroscopy are not excluded. Patient has active, localized or systemic infection. Patient is severely overweight (BMI >40). Patient is a prisoner. Subject has a significant MRI (magnetic resonance imaging) exclusion or contraindication. Patient has had a total joint arthroplasty of the contralateral limb in the last 12 months.