Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees
<strong>Background:</strong> There is a greater risk of tibial component loosening when mobile unicompartmental knee replacement is performed in anterior cruciate ligament deficient knees. We previously reported on a cohort of anterior cruciate ligament deficient patients (n=46) who had...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
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Elsevier
2015
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| _version_ | 1797050381865320448 |
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| author | Pegg, E Mancuso, F Alinejad, M van Duren, B O'Connor, J Murray, D Pandit, H |
| author_facet | Pegg, E Mancuso, F Alinejad, M van Duren, B O'Connor, J Murray, D Pandit, H |
| author_sort | Pegg, E |
| collection | OXFORD |
| description | <strong>Background:</strong> There is a greater risk of tibial component loosening when mobile unicompartmental knee replacement is performed in anterior cruciate ligament deficient knees. We previously reported on a cohort of anterior cruciate ligament deficient patients (n=46) who had undergone surgery, but no difference was found in implant survivorship at mean 5 year follow-up. The purpose this study was to examine the kinematic behaviour of a subcohort of these patients. <strong>Methods:</strong> 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 patients performed step-up and forward lunge exercises. The patellar tendon angle, knee flexion angle and implant position was calculated for each video frame. <strong>Findings:</strong> 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 degrees of flexion. Large variability, particularly from 40-60 degrees 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. <strong>Interpretation:</strong> 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 ligament deficient patient. |
| first_indexed | 2024-03-06T18:04:18Z |
| format | Journal article |
| id | oxford-uuid:00e9010b-50b3-4a2b-a9c4-7305dad969e2 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:04:18Z |
| publishDate | 2015 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:00e9010b-50b3-4a2b-a9c4-7305dad969e22022-03-26T08:32:00ZSagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient kneesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:00e9010b-50b3-4a2b-a9c4-7305dad969e2Symplectic Elements at OxfordElsevier2015Pegg, EMancuso, FAlinejad, Mvan Duren, BO'Connor, JMurray, DPandit, H<strong>Background:</strong> There is a greater risk of tibial component loosening when mobile unicompartmental knee replacement is performed in anterior cruciate ligament deficient knees. We previously reported on a cohort of anterior cruciate ligament deficient patients (n=46) who had undergone surgery, but no difference was found in implant survivorship at mean 5 year follow-up. The purpose this study was to examine the kinematic behaviour of a subcohort of these patients. <strong>Methods:</strong> 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 patients performed step-up and forward lunge exercises. The patellar tendon angle, knee flexion angle and implant position was calculated for each video frame. <strong>Findings:</strong> 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 degrees of flexion. Large variability, particularly from 40-60 degrees 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. <strong>Interpretation:</strong> 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 ligament deficient patient. |
| spellingShingle | Pegg, E Mancuso, F Alinejad, M van Duren, B O'Connor, J Murray, D Pandit, H Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees |
| title | Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees |
| title_full | Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees |
| title_fullStr | Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees |
| title_full_unstemmed | Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees |
| title_short | Sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees |
| title_sort | sagittal kinematics of mobile unicompartmental knee replacement in anterior cruciate ligament deficient knees |
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