optimized loading response by journey ii bcs knee increases daily physical activity and functions

Conditions: Knee Injuries

Summary: smith \& nephew's first edition of the journey posterior stabilizing total knee arthroplasty was analyzed by the center for musculoskeletal research in a past research study, and it was determined that subjects experienced more normal-like kinematic patterns. they also achieved excessive axial rotation and a decrease in weight-bearing knee flexion. since smith \& nephew has made modifications to the journey bi-cruciate stabilizing (bcs) total knee arthroplasty (tka) design, researchers will again evaluate the kinematics of subjects implanted with the revised design to determine if subjects experience normal-like kinematic patterns and if greater weight-bearing knee flexion is achieved. the objective for this study is to analyze the in vivo kinematics for subjects implanted with a 2nd generation journey bcs tka and compare those patterns to subjects having a normal knee and those having the 1st generation journey posterior stabilizing (ps) tka that were analyzed in the previous study.


Eligibility criteria:
inclusion criteria for implanted subjects: * implanted with a journey ii bcs * at least 3 months post-operative with no other surgical procedures within the past 6 months * body mass index (bmi) \< 40 * body weight \< 250 lbs * not pregnant * knee society score (kss) of \> 90 * must be able to walk on level ground without aid of any kind * must be able to perform deep knee bend activity without aid of any kind * must be able to perform chair-rise activity without aid of any kind * must be willing to sign both informed consent and hipaa forms * speak english exclusion criteria for implanted subjects: * other surgical procedures performed within the past 6 months * \< 3 months post-operative * pregnant * severe cardiopulmonary or neurologic disease * body weight \> 250 lbs * bmi \> 40 * kss \< 90 * unable to perform 3 required activities unassisted * unwilling to sign both informed consent and hipaa forms * prisoner * mental disease * unable to speak english inclusion criteria for non-implanted subjects: * healthy, well-functioning knee with no osteoarthritis or knee pathologies * no other surgical procedures within the past 6 months that will prohibit them from performing the three required activities * body mass index \< 40 * body weight \< 250 lbs * not pregnant * knee society score of \> 90 * must be able to walk on level ground without aid of any kind * must be able to perform deep knee bend activity without aid of any kind * must be able to perform chair-rise activity without aid of any kind * must be willing to sign both informed consent and hipaa forms * speak english exclusion criteria for non-implanted subjects: * other surgical procedures performed within the past 6 months that would prohibit them from performing three required activities * any past knee pathologies, osteoarthritis or knee surgeries, including implants * pregnant * severe cardiopulmonary or neurologic disease * body weight \> 250 lbs * bmi \> 40 * kss \< 90 * unable to perform 3 required activities unassisted * unwilling to sign both informed consent and hipaa forms * prisoner * mental disease * unable to speak english