In Vivo Determination of 3D Patellofemoral Mechanics (Patella)
17 de octubre de 2019 actualizado por: Richard Komistek, The University of Tennessee, Knoxville
This study will analyze the tibio-femoral and patellofemoral (motion) and mechanics (forces) of participants having a normal knee or a total knee arthroplasty (TKA) using one or two different (TKA) devices Low Contract Stress (LCS) Posterior Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA).
All knees will be analyzed using an image matching technique that will convert a two-dimensional (2D) fluoroscopic image into a three-dimensional (3D) image.
In conjunction with the fluoroscopic analysis, electromyography (EMG) data, and ground reaction force (GRF) data will all be allow for a complete analysis of the knee joints.
These results will help the orthopaedic community better understand knee motion so they can improve testing on existing implants and develop future implants that will further enhance patients' lives.
Descripción general del estudio
Estado
Terminado
Condiciones
Tipo de estudio
De observación
Inscripción (Actual)
30
Contactos y Ubicaciones
Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.
Ubicaciones de estudio
-
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Colorado
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Denver, Colorado, Estados Unidos, 80210
- Porter Adventist Hospital
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Denver, Colorado, Estados Unidos, 80210
- Colorado Joint Replacement
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Tennessee
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Knoxville, Tennessee, Estados Unidos, 37996
- Perkins Hall
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Knoxville, Tennessee, Estados Unidos, 37996
- Science and Engineering Research Facility
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-
Criterios de participación
Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.
Criterio de elegibilidad
Edades elegibles para estudiar
20 años a 85 años (Adulto, Adulto Mayor)
Acepta Voluntarios Saludables
No
Géneros elegibles para el estudio
Todos
Método de muestreo
Muestra no probabilística
Población de estudio
Subjects recruited from patients chosen from practice of Dr.'s Dennis and Haas at Colorado Joint Replacement for implanted knee, having either one of the two kinds of implants specified.
Descripción
Inclusion Criteria:
- Patients must be at least six months post-operative.
- Potential subjects will have a body weight of less than 250 lbs.
- Candidates must have an AKS score >70 post-operatively.
- Patients must have passive flexion of at least 100.
- Implanted group must have either an LCS PS RP TKA, having an anatomical patella, or Sigma PS RP TKA; or normal knee group must have normal knee.
- Must be willing to sign both Informed Consent and HIPAA forms.
Exclusion Criteria:
- Pregnant females.
- Subjects not meeting study requirements.
Plan de estudios
Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.
¿Cómo está diseñado el estudio?
Detalles de diseño
- Modelos observacionales: Solo caso
- Perspectivas temporales: Retrospectivo
Cohortes e Intervenciones
Grupo / Cohorte |
Intervención / Tratamiento |
|---|---|
|
Knee Prosthesis LCS PS RP TKA
Subjects implanted with DePuy Low Contact Stress (LCS) Poster Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA)
|
Subjects implanted with DePuy Low Contact Stress (LCS) Poster Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA)
|
|
Knee Prosthesis Sigma PS RP TKA
Subjects implanted with a DePuy Sigma Posterior Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA)
|
Subjects implanted with a DePuy Sigma Posterior Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA)
|
|
Control
Subjects with normal knees
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
|
Patella Flexion With Respect to Femur
Periodo de tiempo: Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
Full extension to maximum flexion.
Degrees of flexion analyzed for participants with and without implants.
|
Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
|
Patella Rotation With Respect to Femur
Periodo de tiempo: Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
Patellar rotation from full extension to maximum flexion for subjects with and without implants.
A positive measurement of patellar rotation refers to positive flexion of the patella about the medial-lateral axis, where the patella component rotates so that the top of the patella rotates toward the femur and the bottom rotates away.
Conversely, a negative measurement refers to negative flexion of the patella about this axis, where the patellar component rotates so that the top of the patella moves away from the femur and the bottom moves towards.
|
Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
|
Patella Tilt With Respect to Femur
Periodo de tiempo: Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
full extension to maximum flexion for participants with and without implants.
|
Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
|
Normalized Medial Patella Contact Point Translation
Periodo de tiempo: Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
full extension to maximum flexion for participants with and without implants.
Position of the patellar contact point was determined by locating the closest point to the femur on the patella throughout flexion.
There are 2 patello-femoral contact points: a point on the medial aspect of the patella and a point on the lateral aspect of the patella.
Throughout flexion, the medial contact point generally moves closer to the top of the patella (hence the positive value for the results).
The translation of this contact point is normalized to report a ratio between -1 and 1.
In other words, the distance the point has traveled compared to the total height of the patella.
For example, if the patella is 8 cm in height and the point travels approximately 2 cm upwards during flexion, the value would be reported as +2/8 = +0.25.
Definition of normalized: "multiply (a series, function, or item of data) by a factor that makes the norm or some associated quantity such as an integral equal
|
Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
|
Normalized Lateral Patella Contact Point Translation
Periodo de tiempo: Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
full extension to maximum flexion for participants with and without implants.
Position of patellar contact point was determined by locating closest point to femur on patella throughout flexion.
There are 2 patello-femoral contact points: 1 point on the medial aspect of the patella and 1 point on the lateral aspect of the patella.
Throughout flexion, lateral contact point generally moves closer to the top of the patella (hence, the positive value for the results).
The translation of this contact point is normalized to report a ratio between -1 and 1.
The distance the point has traveled compared to the total height of the patella.
For example, if the patella is 8 cm in height and the point travels approximately 2 cm upwards during flexion, the value would be reported as +2/8 = +0.25.
Definition of normalized: "multiply (a series, function, or item of data) by a factor that makes the norm or some associated quantity such as an integral equal to a desired value (usually 1)."
|
Average post-operative time for LCS-PS group was 56 months. Average post-operative time for PS RP group was 55.7 months.
|
Colaboradores e Investigadores
Aquí es donde encontrará personas y organizaciones involucradas en este estudio.
Patrocinador
Colaboradores
Investigadores
- Investigador principal: Richard D. Komistek, Ph D, The University of Tennessee
- Investigador principal: Douglas Dennis, MD, Colorado Joint Replacement, Porter Adventist Hosp
Fechas de registro del estudio
Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.
Fechas importantes del estudio
Inicio del estudio
1 de febrero de 2011
Finalización primaria (Actual)
1 de septiembre de 2011
Finalización del estudio (Actual)
1 de septiembre de 2011
Fechas de registro del estudio
Enviado por primera vez
3 de febrero de 2011
Primero enviado que cumplió con los criterios de control de calidad
4 de febrero de 2011
Publicado por primera vez (Estimar)
7 de febrero de 2011
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
29 de octubre de 2019
Última actualización enviada que cumplió con los criterios de control de calidad
17 de octubre de 2019
Última verificación
1 de octubre de 2019
Más información
Términos relacionados con este estudio
Otros números de identificación del estudio
- 10035/IIS-000126
- R011373372 (Otro número de subvención/financiamiento: DePuy Orthopaedics)
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .