In Vivo Determination of 3D Patellofemoral Mechanics

Study Results

Results available

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Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

30 participants

Study Classification

OBSERVATIONAL

Study Start Date

2011-02-28

Study Completion Date

2011-09-30

Brief Summary

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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.

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Detailed Description

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Conditions

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Arthroplasty Replacement Knee Knee Prosthesis

Study Design

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Observational Model Type

CASE_ONLY

Study Time Perspective

RETROSPECTIVE

Study Groups

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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 LCS PS RP TKA

Intervention Type DEVICE

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 DePuy Sigma PS RP TKA

Intervention Type DEVICE

Subjects implanted with a DePuy Sigma Posterior Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA)

Control

Subjects with normal knees

No interventions assigned to this group

Interventions

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Subjects implanted with DePuy LCS PS RP TKA

Subjects implanted with DePuy Low Contact Stress (LCS) Poster Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA)

Intervention Type DEVICE

Subjects implanted with DePuy Sigma PS RP TKA

Subjects implanted with a DePuy Sigma Posterior Stabilizing (PS) Rotating Platform (RP) Total Knee Arthroplasty (TKA)

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

1. Patients must be at least six months post-operative.
2. Potential subjects will have a body weight of less than 250 lbs.
3. Candidates must have an AKS score \>70 post-operatively.
4. Patients must have passive flexion of at least 100.
5. 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.
6. Must be willing to sign both Informed Consent and HIPAA forms.