BACKGROUND: There is a greater risk of tibial component loosening when mobile unicompartmental knee replacement is performed in anterior cruciate @entity942 knees. We previously reported on a cohort of anterior cruciate @entity942 @entity1 (n=46) who had undergone surgery, but no difference was found in implant survivorship at a mean 5-year follow-up. The purpose of this study was to examine the kinematic behaviour of a subcohort of these @entity1 . METHODS: The kinematic behaviour of anterior cruciate deficient knees (n=16) after mobile unicompartmental knee replacement was compared to matched intact knees (n=16). Sagittal plane knee fluoroscopy was taken while @entity1 performed step-up and forward lunge exercises. The patellar tendon angle, knee flexion angle and implant position was calculated for each video frame. FINDINGS: The patellar tendon angle was 5   lower in the deficient group, indicating greater anterior tibial translation compared to the intact group between 30 and 40   of flexion. Large variability, particularly from 40-60   of flexion, was observed in the bearing position of the deficient group, which may represent different coping mechanisms. The deficient group took 38% longer to perform the exercises. INTERPRETATION: Kinematic differences were found between the deficient and intact knees after mobile unicompartmental knee replacement; but these kinematic changes do not seem to affect the medium-term clinical outcome. Whether these altered knee kinematics will have a clinical impact is as yet undetermined, but more long-term outcome data is required before mobile unicompartmental knee replacement can be recommended for an anterior cruciate @entity942 @entity1 .

Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate XXXX knees.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity942 :: ('MESH:D003677', 'Disease') :: ['ligament deficient']
@entity942 :: (MESH:D003677,Disease) :: ['ligament deficient']
