Does the Use of Patient Specific Instrumentation Improve Outcomes in Knee Arthroplasty Surgery for Osteoarthritis When Compared to Standard Posterior Referenced Instrumentation?

Summary

The goal of this randomized study is to see if using patient-specific instruments (PSI) during total knee replacement surgery improves outcomes compared to standard instruments. The study focuses on adults with knee osteoarthritis who need knee replacement surgery. Specifically, it aims to answer the following questions:

Does using PSI improve knee function and stability as experienced by the patient? Does PSI lead to more normal knee motion during bending and straightening? Does PSI result in at least as good tibial (shin bone) component fixation as standard instruments? Is PSI more cost-effective than standard instruments? Researchers will compare PSI with standard instruments in 70 patients. Half will receive knee replacement surgery using PSI, and the other half with standard instruments. Patients will be randomly assigned to each group.

Participants will:

Undergo knee replacement surgery with either PSI or standard instruments. Have a series of follow-ups, including assessments of knee function, satisfaction, and alignment of the knee implant, conducted before surgery and at 3 months, 1 year, 2 years, and 5 years after surgery.

The study will include patients aged 40-75 with primary osteoarthritis, a body mass index (BMI) below 35, and no other major medical conditions that could impact surgery. Patients will also need to be willing to undergo necessary imaging, such as magnetic resonance imageing (MRI) scans and standing X-rays.

Outcomes will be measured using various assessment tools, including the Oxford Knee Score, Knee Society Score, and a patient satisfaction survey. Researchers will also record surgery details, such as operating time, blood loss, and knee implant size. Imaging methods, including MRI, computed tomgraphy (CT) scans, and specialized X-rays, will be used to evaluate knee alignment and stability over time.

The results of this study are expected to provide insights into whether patient-specific instruments offer clinical or economic advantages over traditional tools in knee replacement surgery.

Conditions

• Primary Osteoarthritis Patients Scheduled for Total Knee Replacement Surgery
• Osteoarthritis (OA) of the Knee

Interventions

DEVICE

Patient specific instrumentation (PSI)

Cutting guides that are manufactured using advanced imaging and modelling techniques to create instruments that align more closely with the unique anatomy of each patient. Custom guides were created based on a preoperative MRI protocol (Zimmer Patient Specific Instrumentation for NexGen® Complete Knee Solution, Zimmer Biomet, Warsaw, Indiana, United States in collaboration with Materialise NV, Leuven, Belgium) to optimize the placement of the components without the need for intramedullary alignment.

DEVICE

Conventional instruments

Instruments specific to the implant that are used to guide bone cutting in reference to the intramedullary canal or using an extramedullary jig.

PROCEDURE

Cemented Total Knee Arthroplasty

A cemented TKA (NexGen® Complete Knee Solution, Zimmer Biomet, Warsaw, Indiana, United States) is used in all cases with a cruciate retaining (CR) or posterior stabilized (LPS) prosthesis as determined by the surgeon.

Sponsors & Collaborators

• Zimmer Biomet

  collaborator INDUSTRY

• Ingabritt och Arne Lundbergs Forskningsstiftelse

  collaborator UNKNOWN

• Vastra Gotaland Region

  lead OTHER_GOV

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Model

PARALLEL

Eligibility

Min Age

40 Years

Max Age

75 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2014-03-03

Primary Completion

2019-12-31

Completion

2024-12-31

FDA Device

Yes

Countries

• Sweden

Study Locations