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This prospective study aims to systematically compare the clinical and radiological outcomes and complications of mobile versus fixed unicompartimental knee prostheses.
In knee surgery, two dominant designs exist for the medial unicompartmental knee prosthesis (UKP): the fixed bearing (FB) and mobile bearing (MB) designs. The FB design is technically simpler to implant but has shown higher rates of early polyethylene wear in some studies. MB implants theoretically offer advantages in joint kinematics and load distribution but carry a risk of insert dislocation and periprosthetic fractures. An additional advantage of MB implants is the possibility of cementless implantation, potentially avoiding cement-related complications and reducing operative time.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Mobile UKP | Mobile unicompartmental knee prosthesis | ||
| Fixed UKP | Fixed unicompartmental knee prosthesis |
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| Measure | Description | Time Frame |
|---|---|---|
| OKS | Oxford Knee Score | Preoperatively, 6 weeks, 4 months, 12 months, and 24 months postoperatively. |
| Measure | Description | Time Frame |
|---|---|---|
| AMI | Arthrogenic Muscle Inhibition - DOI: 10.1002/ksa.12804 for grading | Evaluate AMI (Arthrogenic Muscle Inhibition) preoperative, at 6 weeks and 4 months postoperative. |
| Surgery time | Operative time |
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Inclusion Criteria:
Exclusion Criteria:
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Patients eligible for a unicompartmental medial knee prosthesis based on the eligibility criteria.
| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Lenka Stroobant | Contact | +32496867115 | lenka.stroobant@ugent.be |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Orthopedic department | Recruiting | Ieper | Oost-Vlaanderen | 8900 | Belgium |
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| Peroperatively |
| Complications | Postoperative complications | Within 2 years postoperatively |
| Revision or reoperation | Revision or reoperation | Within 2 years postoperatively |
| c-FCA | Coronal Femoral Component Alignment - Varus/valgus alignment for the femoral component is measured on the AP radiograph in relation to the anatomical axis of the tibia. 0° degrees is considered neutral. | 6 weeks and 4 months postoperatively |
| EQ-5D-5L | The 5-level EQ-5D version. | Preoperatively, 6 weeks, 4 months, 12 months, and 24 months postoperatively. |
| NRS | Numeric Rating Scale | Preoperatively, one week, 6 weeks, 4 months, 12 months, and 24 months postoperatively.] |
| KOOS-PS | Knee Injury and Osteoarthritis Outcome Score-Physical function Short form | Preoperatively, 6 weeks, 4 months, 12 months, and 24 months postoperatively. |
| c-TCA | Coronal Tibial Component Alignment - Varus/valgus alignment for the tibial component is measured on the AP radiograph in relation to the anatomical axis of the tibia. 0° is considered neutral. | 6 weeks and 4 months postoperatively |
| s-FCA | Sagittal Femoral Component Alignment - Flexion/extension is measured on a lateral radiograph, relative to the posterior tibial cortex. A posteroinferior slope of 7° is considered neutral. | 6 weeks and 4 months postoperatively |
| s-FCA | Sagittal Femoral Component Alignment - Flexion/extension is measured on a lateral radiograph, relative to the posterior femoral cortex. 0° is considered neutral. | 6 weeks and 4 months postoperatively |
| RLL | Radiolucencies - Radiolucencies after UKR are divided into two types: physiological and pathological. The former are < 2 mm thick, well defined, and accompanied by a parallel radiodense line, whereas the latter are > 2 mm thick, ill defined, and lacking accompanying radiodense lines. The pattern observed should be recorded as well as their location, which is divided into six zones on the AP view of the tibial component and six zones on the lateral view of the femoral component. Evaluation based on the zones of the Knee Society. | 6 weeks and 4 months postoperatively |