Conventional Alignment System Versus Surgical Navigation System in Total Knee Arthroplasty

Not Applicable

Completed

Conditions: Osteoarthritis, Knee

Registration Number: NCT01797731

Lead Sponsor: Hospital for Special Surgery, New York

Brief Summary: This is a randomized, controlled, blinded prospective study comparing the use of the usual cutting guides with a palm-sized digital surgical navigation system in unilateral total knee arthroplasty. Analysis of pre- and post-operative X-rays will be used to compare alignment of the tibial (shinbone) implant components. The investigators expect that the FDA-approved hand-held surgical navigation device will increase the accuracy and precision of the tibial cut by telling the surgeon the exact position of the cutting block before the surgeon makes the cut, allowing minor adjustments to be made. The investigators expect the conventional device to take less time to use, but that this difference will decrease as the surgeon becomes more familiar with the device. The investigators expect the intraoperative measurements acquired by the KneeAlign system to strongly correlate with the radiographic alignments measured postoperatively.

Detailed Description: Medical records, private office charts, and electronic medical records will be utilized by the co-investigators to review data on patients who fit the previously stated inclusion criteria. Demographic data including age, gender, height (cm), and weight (kg) will be collected. Preoperative, standing anteroposterior hip-to-ankle radiographs will be measured for the lower extremity mechanical axis, the tibiofemoral anatomic alignment, and the distal femoral and proximal tibial anatomic angles. Intraoperative time measurements for use of both the conventional extramedullary alignment guide, and the KneeAlignTM system will be measured and recorded. The time required to utilize each alignment guide will be measured in seconds, starting from the time at which the surgeon is handed the alignment guide (KneeAlignTM or conventional, extramedullary), to the time at which the surgeon is handed the oscillating saw to make the tibial cut. Of note, no intraoperative alignment measurements are required or will be recorded for the conventional, extramedullary systems, while intraoperative alignments reported by the KneeAlignTM system will be recorded when the KneeAlignTM device is used. In addition, regarding the use of conventional, extramedullary tibial guides, each surgeon will utilize the guide (regardless of manufacturer) which they currently use most frequently when performing a total knee arthroplasty. While there may be minimal differences with regards each of the surgeon's conventional guides, they are all essentially the same with regards to utilizing an extramedullary rod for alignment of the tibial resection.

Currently, a total knee replacement requires an average tourniquet time of 30-50 minutes depending on the surgeon. We estimate an approximate increase in total tourniquet time of 5-6 minutes when using the hand-held surgical navigation system.

For each procedure (either KneeAlignTM or conventional, extramedullary guides), after making the initial cut, if at any point in the procedure the surgeon re-cuts the tibia, they will be asked a series of questions postoperatively as to why they re-cut the tibia as part of the data collection. These questions will include:

1. Did you re-cut the tibia because you thought more varus or valgus was required?

2. Did you re-cut the tibia to increase or decrease the posterior slope?

3. Did you re-cut the tibia to increase the amount of bone resected?

4. Were you happy with the overall tibial alignment? Postoperative radiographs will be obtained as part of each surgeon's postoperative protocol, and will include a standing anteroposterior hip-to-ankle radiograph and a standing lateral knee-to-ankle radiograph, from which the lower extremity mechanical axis, the tibiofemoral anatomic alignment, the tibial component mechanical alignment, and the tibial component posterior slope will be measured.

This study has the potential to provide significant information regarding the clinical accuracy and precision of the KneeAlignTM system compared to that of conventional, extramedullary alignment systems. If mechanical and tibial mechanical alignment is significantly improved with the use of the KneeAlignTM system, this may encourage surgeons to utilize this device to improve postoperative alignment in total knee arthroplasty. In addition, surgeon's may find this type of hand-held system more user-friendly (in contrast to a large console, computer-assisted surgical system), and this may stimulate future investigations into similar devices for femoral component alignment, and also total hip arthroplasty.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 100

Inclusion Criteria

a history of osteoarthritis, rheumatoid arthritis, or post-traumatic arthritis
patients who have been indicated for a primary, posterior-stabilized, total knee arthroplasty
patients have had a preoperative standing anteroposterior hip-to-ankle radiograph and standing lateral knee-to-ankle radiographs

Exclusion Criteria

patients with proximal tibial defects requiring either a metal or allograft augment
inadequate radiographic studies as required by the study protocol
if they do not receive a total knee arthroplasty, or receive a unicondylar arthroplasty

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Postoperative Tibial Component Alignment	6 weeks after surgery	The primary outcome will be the number of patients (percentage of patients) that met a predetermined criteria for Alignment as defined by within 2° of perpendicular to the tibial mechanical axis or 2° of a 3° posterior slope, postoperative tibial component alignment (mechanical varus/valgus, and posterior slope) as measured on postoperative standing anteroposterior hip-to-ankle radiographs, and standing, lateral knee-to-ankle radiographs, respectively.

Secondary Outcome Measures

Name	Time	Method
Time Required to Utilize System	Minutes during surgery ( Estimated time per surgery 1 hour)	The amount of time required to utilize conventional, tibial extramedullary alignment guides versus the KneeAlignTM system, which will be recorded intraoperatively.