ANZCTR - Registration

Please note the ANZCTR will be unattended from Friday 20 December 2024 for the holidays. The Registry will re-open on Tuesday 7 January 2025. Submissions and updates will not be processed during that time.

Registering a new trial?

To achieve prospective registration, we recommend submitting your trial for registration at the same time as ethics submission.

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been endorsed by the ANZCTR. Before participating in a study, talk to your health care provider and refer to this information for consumers

Trial registered on ANZCTR

Registration number

ACTRN12611000147987

Ethics application status

Approved

Date submitted

4/02/2011

Date registered

8/02/2011

Date last updated

9/07/2019

Date data sharing statement initially provided

9/07/2019

Date results provided

9/07/2019

Type of registration

Prospectively registered

Titles & IDs

Public title

Comparison study of two different techniques for knee replacement

Scientific title

In patients with osteoarthritis of the knee, are patient specific cutting guides used for total knee joint replacement as good as computer-assisted surgery for patient outcomes?

Secondary ID [1]

ShapeMatchNZRCT-10

Universal Trial Number (UTN)

U1111-1119-0601

Trial acronym

Linked study record

Health condition

Health condition(s) or problem(s) studied:

Osteoarthritis of the knee

Condition category

Condition code

Musculoskeletal

Osteoarthritis

Surgery

Surgical techniques

Intervention/exposure

Study type

Interventional

Description of intervention(s) / exposure

For patients requiring a total knee replacement a new method has been developed which may improve patient satisfaction levels in terms of function and pain after surgery. Instead of using conventional measuring and cutting equipment and computer-assisted navigation (Control Group), patient-specific cutting guides will be manufactured based on pre-operative Magnetic Resonance Imaging (MRI) scans of the patient's leg (Intervention Group). The patient will have a total knee replacement performed using these cutting guides which will ultimately align the patient’s prosthesis according to their natural leg alignment (as opposed to the convention way where the patient’s leg is aligned according to a mechanical axis of 0 degrees). The procedure will take approximately 45 minutes.
Both groups will receive the same type of implant. Patients will be followed up at 6 weeks, 6 months and 12 months and also have a Computed Tomography (CT) scan at 3 months.

Intervention code [1]

Treatment: Devices

Comparator / control treatment

Patients in the Control Group will receive a total knee replacement using conventional methods and equipment where their implant will be positioned so that their leg is a straight line from their hip to their ankle (i.e. mechanical axis of 0 degrees). The procedure will take approximately 45 minutes.

Patients will be randomized to either the Control Group or Intervention Group and will not be told which group they have been assigned to. As a result, patients assigned to the Control Group will also need to have a pre-operative MRI scan.
Patients in the Control Group will also be followed up at 6 weeks, 6 months and 12 months, and also have a Computed Tomography (CT) scan at 3 months.

Control group

Active

Outcomes

Primary outcome [1]

To demonstrate, through calculation of Oxford Knee Score at 12 months postoperative, that total knee replacement (TKR) performed using the ShapeMatch Cutting Guide provides improvement from preoperative levels of patient pain and function comparable to the improvement obtained with TKR performed using computer-assisted Navigation.

Timepoint [1]

Pre-operatively and 6 weeks, 6 months and 12 months post-operatively.

Secondary outcome [1]

The efficacy objective is to compare radiographic, pain, function and health-related quality of life (QOL) between the ShapeMatch Cutting Guide group and the computer-assisted Navigation control group. This objective will be achieved by utilizing the following instruments pre-operatively and at the 6-week, 6-month and 12 month visits:
- Perth CT protocol
- AP and ML X-rays
- The International Knee Society Score (IKSS)
- The Forgotten Joint Score (FJS-12)
- WOMAC
- EQ-5D
- VAS Pain

Timepoint [1]

Pre-operatively and 6 weeks, 6 months and 12 months post-operatively.

Secondary outcome [2]

To compare the cost-effectiveness and cost-utility of the procedure between the ShapeMatch Cutting Guide group and the computer-assisted Navigation control group. This objective will be assessed by recording and calculating the following parameters:
- Wound length
- Total duration of operating procedure (anaesthetic time and skin-to-skin incision time)
- Cost of consumable items used during operating procedure
- Length of stay in hospital
- Quality-adjusted life-years (QALYs) from EQ-5D

Timepoint [2]

Intra-operatively, at hospital discharge and at 6 weeks, 6 months and 12 post-operatively.

Eligibility

Key inclusion criteria

- The patient is a male or non-pregnant female between the ages of 50-80.
- The patient requires a primary total knee replacement and is indicated for computer-assisted surgery.
- The patient has a primary diagnosis of osteoarthritis (OA).
- The patient has intact collateral ligaments.
- The patient is able to undergo MRI scanning of the affected limb.
- The patient has signed the study specific, HREC-approved, Informed Consent document.
- The patient is willing and able to comply with the specified pre-operative and post-operative clinical and radiographic evaluations.

Minimum age

40 Years

Maximum age

80 Years

Sex

Both males and females

Can healthy volunteers participate?

Key exclusion criteria

- The patient has a history of total, unicompartmental reconstruction or fusion of the affected joint.
- Patient has had a high tibial osteotomy or femoral osteotomy.
- The patient is morbidly obese (BMI is greater than or equal to 40).
- The patient has a deformity which will require the use of stems, wedges or augments in conjunction with the Triathlon Total Knee System.
- The patient has varus or valgus malalignment greater than or equal to 15 degrees (relative to mechanical axis).
- The patient has a fixed flexion deformity greater than or equal to 15 degrees.
- The patient has a neuromuscular or neurosensory deficiency, which would limit the ability to assess the performance of the device.
- The patient has a systemic or metabolic disorder leading to progressive bone deterioration.
- The patient is immunologically suppressed or receiving steroids in excess of normal physiological requirements.
- Patient has a cognitive impairment, an intellectual disability or a mental illness.
- The patient is pregnant.
- The patient has metal hardware present in the region of the hip, knee or ankle (as this is known to create geometrical distortion in the region of the implant).
- The patient has any known contraindications for undergoing assessment by MRI (e.g. ferrous implants, metallic clips, magnetically activated implanted devices such as cardiac pacemakers, etc).

Study design

Purpose of the study

Treatment

Allocation to intervention

Randomised controlled trial

Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)

Patients will be enrolled in the study after signing the informed consent form and meeting the inclusion and exclusion criteria. If participants met these criteria they will be randomised to either the Control Group or the Intervention Group.
This will be achieved via a block randomisation process. A central randomisation list will be computer generated by a consultant statistician. Once a patient has met criteria for enrolment, the Principal Investigator or designee will phone/email the Sponsor with the Initials, Date of Birth and Patient Number (assigned in ascending order at time of recruitment). A randomisation number, corresponding to a randomisation envelope held at the study site, will be provided. Once this number is received the envelope will be located and opened. The Principal Investigator will note the group allocation in the Case Report Form.

Methods used to generate the sequence in which subjects will be randomised (sequence generation)

A computer will generate a randomisation sequence which will allocate each study number to either the control group or the intervention group.

Masking / blinding

Blinded (masking used)

Who is / are masked / blinded?

Intervention assignment

Parallel

Other design features

Phase

Not Applicable

Type of endpoint/s

Efficacy

Statistical methods / analysis

Recruitment

Recruitment status

Completed

Date of first participant enrolment

Anticipated

7/06/2011

Actual

4/08/2011

Date of last participant enrolment

Anticipated

Actual

7/03/2013

Date of last data collection

Anticipated

Actual

9/04/2018

Sample size

Target

100

Accrual to date

Final

100

Recruitment outside Australia

Country [1]

New Zealand

State/province [1]

Funding & Sponsors

Funding source category [1]

Commercial sector/Industry

Name [1]

Stryker Australia

Address [1]

8 Herbert Street
St Leonards, Sydney
NSW 2065

Country [1]

Australia

Primary sponsor type

Commercial sector/Industry

Name

Stryker Australia

Address

8 Herbert Street
St Leonards, Sydney
NSW 2065

Country

Australia

Secondary sponsor category [1]

None

Name [1]

Address [1]

Country [1]

Ethics approval

Ethics application status

Approved

Ethics committee name [1]

Northern X Regional Ethics Committee

Ethics committee address [1]

3rd Floor, Unisys Building
650 Great South Road, Penrose, Auckland, NZ

Ethics committee country [1]

New Zealand

Date submitted for ethics approval [1]

15/03/2011

Approval date [1]

05/05/2011

Ethics approval number [1]

NTX/11/03/017

Summary

Brief summary

Traditionally the goal of the knee replacement has been to position the components such that the alignment goal is a straight limb, or a mechanical axis of 0 degrees.  This has been considered desirable from an engineering point of view to maximise implant longevity, however patient satisfaction of total knee replacement has not always been ideal.

The opportunity exists to provide an alternative approach to total knee replacement surgery which may improve patient outcomes.  One such approach is to determine the optimal placement of components based on the individual anatomy of patients, rather than a generic limb alignment philosophy.  A three-dimensional description of the anatomy can be obtained by magnetic resonance imaging (MRI) scans obtained pre-operatively.  It is then possible to develop a model of the arthritic bone and cartilage, adapt that model to take into account degenerative processes, and generate a model of the pre-arthritic anatomy.  The pre-arthritic state then becomes the surgical goal in terms of limb alignment.  Custom cutting guides are generated for each individual patient to enable the surgeon to perform the bone resections in such a way that the resultant construct with the total knee replacement components reproduces the pre-disease limb alignment.

The aim of the study is to observe whether there is any difference in outcome following a total knee replacement in terms of pain and function at early follow-up (6 weeks, 6 months and 12 months) between the ShapeMatch Cutting Guide group and the control group.  Radiographic, pain, function and health-related quality of life will be compared between both groups using various questionnaires which patients will complete prior to the operation and at 6 weeks, 6 months and 12 months following their total knee replacement.

The study will also aim to compare the cost-effectiveness and cost-utility of the procedure between the ShapeMatch group and the Navigation group by recording and calculating various parameters including total duration of operating procedure and length of stay in hospital following the operation.

Trial website

Trial related presentations / publications

Young, S.W., Walker, M., Bayan, A., Briant-Evans, T., Pavlou, P. and Farrington, B., 2017. No difference in 2-year functional outcomes using kinematic versus mechanical alignment in TKA: a randomized controlled clinical trial. Arthroscopy, 33(10), p.e115.

Public notes

Contacts

Principal investigator

Name

Dr Bill Farrington

Address

North Shore Hospital
Shakespeare Road
North Shore City
Auckland 0622
NEW ZEALAND

Country

New Zealand

Phone

64 21 221 4002

Fax

William.farrington@waitematadhb.govt.nz

Contact person for public queries

Name

Simone Mclean

Address

Clinical Research Associate II. Stryker Australia 8 Herbert Street ST LEONARDS NSW 2065

Country

Australia

Phone

61 2 9467 1281

Fax

simone.mclean@stryker.com

Contact person for scientific queries

Name

David Fulker

Address

Clinical Research Associate. Stryker Australia 8 Herbert Street ST LEONARDS NSW 2065

Country

Australia

Phone

61 2 9467 1072

Fax

david.fulker@stryker.com

Data sharing statement

Will individual participant data (IPD) for this trial be available (including data dictionaries)?

No/undecided IPD sharing reason/comment

What supporting documents are/will be available?

No Supporting Document Provided

Results publications and other study-related documents

Documents added manually

No documents have been uploaded by study researchers.

Documents added automatically

No additional documents have been identified.

Trial Review

Registering a new trial?

Documents added manually

Documents added automatically