Osteoarthritis of the Knee
Conditions
Brief summary
This is a randomised control trial to assess the benefits of using patient specific instrumentation in total knee replacement surgery. Patient specific instrumentation is an individualised system for total knee replacement surgery. The system has been marketed and is already in use in some centres. The type of implant used remains the same but the sizing of the components, and alignment of the implant is expected to improve. This study assesses any improvement in implant alignment in using the patient specific instrumentation, any improved intra-operative outcomes and any long term clinical outcome improvements for patients.
Detailed description
This is a randomised control trial to assess the benefits of using patient specific instrumentation in total knee replacement surgery. Patient specific instrumentation is an individualised system for total knee replacement surgery. The system has been marketed and is already in use in some centres. The process is similar to traditional knee replacement surgery but approximately 6 weeks prior to the operation patients will undergo an MRI scan of their knee, hip and ankle. From this data the dimensions and rotation of the knee can be accurately measured, and a custom made jig can be made specific to that patients anatomy. The jig is used intra-operatively to make accurate bone cuts according to this pre-operative plan, the type of implant used remains the same but the sizing of the components, and alignment of the implant is expected to improve. This study assesses any improvement in implant alignment in using the patient specific instrumentation, any improved intra-operative outcomes and any long term clinical outcome improvements for patients.
Interventions
DEVICEZimmer Patient specific instruments
A custom made cutting block will be used during total knee replacement surgery. The cutting block is made specific to patient's anatomy based on MRI scans taken 6 weeks prior to surgery.
DEVICEStandard instrumentation
Standard instrumentation will be used during total knee replacement surgery.
Sponsors
Sheffield Teaching Hospitals NHS Foundation Trust
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* Males and females aged 18-75 years at time of surgery. * Those presenting with primary or secondary osteoarthritis and/or rheumatoid arthritis of the knee. * Those deemed capable of giving informed consent, understanding the aims of the study and expressing willingness to comply with the post-operative review programme. * Patients who signed the study consent form prior to surgery.
Exclusion criteria
* Pregnant women. * Those whose prospects for a recovery to independent mobility would be compromised by known coexistent, medical problems. * Those with a known co-existent medical condition where death is anticipated within five years due to the pre-existing medical condition. * Previous knee surgery including those already treated by with a total knee replacement (i.e. requiring a revision knee replacement). * Muscle contracture around the knee joint * Individuals with active or suspected infection or sepsis. * Patients with contraindication to MRI
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Implant alignment | 6 weeks | Sagittal and coronal alignment of the knee arthroplasty implant will be measured on full length radiographs |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Oxford Knee Score | 1yr, 5yr, 10yr | Patient questionnaire |
Other
| Measure | Time frame | Description |
|---|---|---|
| EUROQOL-5D | 1 year, 5 years and 10 years | — |
| IKKS Score | 1yr, 5 yr, 10yr | Questionnaire |
Countries
United Kingdom
Outcome results
None listed