Hans Gray

Additively manufactured controlled porous orthopedic joint replacement designs to reduce bone stress shielding: a systematic review

Sarah Safavi, Yihang Yu, Dale L Robinson, Hans A Gray, David C Ackland, Peter VS Lee

Journal article  |  2023  |  JOURNAL OF ORTHOPAEDIC SURGERY AND RESEARCH

BACKGROUND: Total joint replacements are an established treatment for patients suffering from reduced mobility and pain due to sev..

Anterior-cruciate-ligament reconstruction does not alter the knee-extensor moment arm during gait.

Padma N Ganapam, Shanyuanye Guan, Hans A Gray, S Sujatha, Marcus G Pandy

Journal article  |  2022  |  Gait Posture

BACKGROUND: The ability of the quadriceps muscles to extend the knee depends on the moment arm of the knee-extensor mechanism, whi..

A Two-Degree-of-Freedom Knee Model Predicts Full Three-Dimensional Tibiofemoral and Patellofemoral Joint Motion During Functional Activity

Shanyuanye Guan, Hans A Gray, Lucas T Thomeer, Marcus G Pandy

Journal article  |  2022  |  ANNALS OF BIOMEDICAL ENGINEERING

Six kinematic parameters are needed to fully describe three-dimensional (3D) bone motion at a joint. At the knee, the relative mov..

Articular contact motion at the knee during daily activities

Lucas T Thomeer, Shanyuanye Guan, Hans A Gray, Marcus G Pandy

Journal article  |  2021  |  JOURNAL OF ORTHOPAEDIC RESEARCH

We combined mobile biplane X-ray imaging and magnetic resonance imaging to measure the regions of articular cartilage contact and ..

Moment arm of the knee-extensor mechanism measured in vivo across a range of daily activities

Hans A Gray, Shanyuanye Guan, Lucas T Thomeer, Marcus G Pandy

Journal article  |  2021  |  JOURNAL OF BIOMECHANICS

We measured the moment arm of the knee-extensor mechanism as ten healthy young individuals performed six functional activities: le..

Six-Degree-of-Freedom Tibiofemoral and Patellofemoral Joint Motion During Activities of Daily Living.

Lucas Thomeer, Shanyuanye Guan, Hans Gray, Anthony Schache, Richard de Steiger, Marcus Pandy

Journal article  |  2021  |  Annals of Biomedical Engineering

The purpose of this study was to measure the three-dimensional movements of the femur, tibia and patella in healthy young people d..

Biomechanical Leg Muscle Function During Stair Ambulation in Men Receiving Androgen Deprivation Therapy

Ada S Cheung, Hans A Gray, Anthony G Schache, Rudolf Hoermann, Jarrod Bicknell, Daryl Lim Joon, Jeffrey D Zajac, Marcus G Pandy, Mathis Grossmann

Journal article  |  2020  |  JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES

BACKGROUND: The role of testosterone in maintaining functional performance in older men remains uncertain. METHODS: We conducted a..

Comparison of posterior-stabilized, cruciate-retaining, and medial-stabilized knee implant motion during gait.

Hans A Gray, Shanyuanye Guan, Tony J Young, Michelle M Dowsey, Peter F Choong, Marcus G Pandy

Journal article  |  2020  |  Journal of Orthopaedic Research

Accurate knowledge of knee joint motion is needed to evaluate the effects of implant design on functional performance and componen..

Selective Loss of Levator Ani and Leg Muscle Volumes in Men Undergoing Androgen Deprivation Therapy

Ada S Cheung, Christopher Cunningham, Dong-Kyoon Daniel Ko, Vivian Ly, Hans Gray, Rudolf Hoermann, Boyd JG Strauss, Ebrahim Bani Hassan, Gustavo Duque, Peter Ebeling, Marcus G Pandy, Jeffrey D Zajac, Mathis Grossmann

Journal article  |  2019  |  JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM

CONTEXT: Androgen deprivation therapy (ADT) for prostate cancer (PCa) leads to a selective loss of leg muscle function during walk..

SIX-DEGREES-OF-FREEDOM KINEMATICS OF POSTERIOR-STABILIZED, CRUCIATE-RETAINING AND MEDIAL-STABILIZED KNEE IMPLANTS IN OVERGROUND WALKING

Hans Gray, Shanyuanye Guan, Michelle Dowsey, Peter Choong, Marcus Pandy

Conference Proceedings  |  2019

INTRODUCTION The medial-stabilised (MS) knee implant, characterised by a spherical medial condyle on the femoral component and a m..