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.
Study Type
OBSERVATIONAL
Enrollment
200
Orthopedic department
Ieper, Oost-Vlaanderen, Belgium
RECRUITINGOKS
Oxford Knee Score
Time frame: Preoperatively, 6 weeks, 4 months, 12 months, and 24 months postoperatively.
AMI
Arthrogenic Muscle Inhibition - DOI: 10.1002/ksa.12804 for grading
Time frame: Evaluate AMI (Arthrogenic Muscle Inhibition) preoperative, at 6 weeks and 4 months postoperative.
Surgery time
Operative time
Time frame: Peroperatively
Complications
Postoperative complications
Time frame: Within 2 years postoperatively
Revision or reoperation
Revision or reoperation
Time frame: 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.
Time frame: 6 weeks and 4 months postoperatively
EQ-5D-5L
The 5-level EQ-5D version.
Time frame: Preoperatively, 6 weeks, 4 months, 12 months, and 24 months postoperatively.
NRS
Numeric Rating Scale
Time frame: Preoperatively, one week, 6 weeks, 4 months, 12 months, and 24 months postoperatively.]
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KOOS-PS
Knee Injury and Osteoarthritis Outcome Score-Physical function Short form
Time frame: 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.
Time frame: 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.
Time frame: 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.
Time frame: 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.
Time frame: 6 weeks and 4 months postoperatively