Different femorotibial contact points between fixed- and mobile-bearing TKAs do not show clinical impact.
Knee Surg Sports Traumatol Arthrosc
; 23(11): 3368-74, 2015 Nov.
Article
en En
| MEDLINE
| ID: mdl-25038883
PURPOSE: In anteroposterior (AP)-gliding mobile-bearing total knee arthroplasty (TKA), the femoral component can theoretically slide forward resulting in a more anterior contact point, causing pain due to impingement. A lower lever arm of the extensor apparatus can also attribute to higher patella pressures and pain. The goal of this study was to determine the contact point in a cohort of mobile- and fixed-bearing TKAs, to determine whether the contact point lies more anteriorly in mobile-bearing TKA and to confirm whether this results in anterior knee pain. METHODS: We used 38 fixed-bearing TKA and 40 mobile-bearing TKA from a randomized trial with straight lateral knee X-rays and measured the contact point. The functional outcome was measured by Knee Society Score at 12 months postoperatively. Pain scores were analysed using a VAS score (0-100 mm) in all patients at rest and when moving. Difficulty at rising up out of a chair was also assessed using a VAS score. RESULTS: The contact point in mobile-bearing TKA was situated at 59.5 % of the AP distance of the tibia and in the fixed-bearing TKA group at 66.1 % (P< 0.05). Patients with mobile- and fixed-bearing TKAs had similar knee scores, pain scores and difficulty in chair rise. No significant correlation was found between contact point and knee pain. CONCLUSION: The hypothesis of a more anterior contact point in the mobile-bearing cohort was confirmed but no correlation with functional and pain scores in this cohort could be found. The tibiofemoral contact point could not be correlated with a different clinical outcome and higher incidence of anterior knee pain. This study further adds to the knowledge on possible differences between mobile- and fixed-bearing prostheses. Next to that, bad outcomes could not be explained by CP. LEVEL OF EVIDENCE: Case series, Level IV.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Diseño de Prótesis
/
Artroplastia de Reemplazo de Rodilla
/
Articulación de la Rodilla
/
Prótesis de la Rodilla
Tipo de estudio:
Clinical_trials
/
Etiology_studies
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Incidence_studies
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Observational_studies
/
Risk_factors_studies
Límite:
Aged
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Female
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Humans
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Male
Idioma:
En
Revista:
Knee Surg Sports Traumatol Arthrosc
Asunto de la revista:
MEDICINA ESPORTIVA
/
TRAUMATOLOGIA
Año:
2015
Tipo del documento:
Article
País de afiliación:
Países Bajos
Pais de publicación:
Alemania