Kinematic Analysis: Posterior Stabilized, Fixed Bearing Total Knee Arthroplasty With Attune Knee System

N/ACompletedNCT02204748

The University of Tennessee, Knoxville5 enrolled

Overview

A better understanding of knee joint kinematics is important to explain the premature polyethylene wear failures within total knee arthroplasties (TKAs) and to help design a prosthesis that most closely approximates the normal knee. Specifically, posterior stabilizing (PS) knees have been found to be associated with lower amounts of posterior femoral rollback, higher occurrence of reverse axial rotation and increased amount of condylar lift-off. The DePuy Synthes Joint Reconstruction's Attune PS fixed bearing (FB) knee system has incorporated subtle changes in its design to address restoration of kinematics that more closely resemble those of a normal knee. To understand if this design is able to effectively restore kinematics in the implanted knee, further in vivo analysis is necessary. This pilot study will analyze 5 subjects with the Attune PS FB 3 months post-operatively using the University of Tennessee's mobile fluoroscopy unit while performing three daily activities, level walking, ramp down and deep knee bend. Since this is a pilot study, there is no hypothesis.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Total Knee Arthroplasty Osteoarthritis

Interventions

Eligibility

Sex: ALLMin age: 30 YearsMax age: 80 Years

Medical Language ↔ Plain English

Inclusion Criteria: * At least three (3) months post-operative with no other surgical procedures conducted within the past six months * Between 30-80 years of age * Body weight of less than 280 lbs * Must be between 160cm (5'3) and 193cm (6'4) tall * Body Mass Index (BMI) \>18.5 and \<35 * Judged clinically successful with a Knee Society score (KSS) of greater than 80 * Have good-to-excellent post-operative passive flexion with no ligamentous laxity or pain * Must be able to walk on level ground without aid of any kind, perform a ramp descent, and a deep knee bend (DKB), all without assistance * Will have a DePuy Attune PS TKA * Must be willing to sign the Informed Consent (IC) and HIPAA forms to participate in the study Exclusion Criteria: \- Pregnant or potentially pregnant females will be excluded from the study

Locations (2)

OrthoCarolina Research Institute

Charlotte, North Carolina, United States

The University of Tennessee

Knoxville, Tennessee, United States

Outcomes

Primary Outcomes

Femoro-tibial Kinematics - Translation and Lift-off for Deep Knee Bend

Amount of translation and lift-off for implanted knee in vivo under fluoroscopic surveillance during deep knee bend activity.