Our Research team operates out of our Chatswood office, while also collecting data at the Mater and RPA hospitals. Working across the organisation, our researchers regularly collaborate with other community service agencies, universities, research institutes and government agencies to complete research studies.

Research Team

Samuel Grasso

Samuel Grasso B. Engineering, PhD

Clinical Applications Engineer

Samuel has completed a Bachelor of Mechanical Engineering degree and a Doctor of Philosophy in Biomedical Engineering (2018) at the University of Sydney. His research incorporates computational and image based methodologies to measure and optimise ligament position in ACL reconstruction on a patient specific basis, to improve pre-surgical planning processes and post-operative assessment.

Samuel is responsible for Sydney Orthopaedic Research Institutes research and development activities involving computational modelling.

Yoong Lim

Yoong Lim PhD

Research Associate

Yoong is a research associate and conducts biomechanical research relating to knee conditions. Here, he conducts biomechanical experiments and computational analyses using SORI’s state-of-the-art 3D biomechanics laboratory. Yoong’s current research projects are return-to-sport assessments for anterior cruciate ligament (ACL) reconstruction patients and gait analyses for ACL and high tibial osteotomy (HTO) patients. His research interests are musculoskeletal modelling and ultrasound image processing.

Yoong has completed postdoctoral trainings and a PhD (Biomechanical Engineering, University of Melbourne) on computational and experimental biomechanics.

Harbeer Ahedi

Harbeer Ahedi, PhD

Senior clinical research associate/ Database manager

Dr Harbeer Ahedi has a PhD in biomedical sciences with an extensive background in Osteoarthritis, data management and statistics. Her career has been a balance between academic and clinical research. As a researcher her focus has been on developing preventive techniques to reduce incidence of Osteoarthritis (OA) and improve the utilization of imaging modalities to study the epidemiology of OA. Currently she is the Senior Research Assistant/Data Coordinator at Sydney Orthopedic Research Institute. 


Arpita Das MPH BDS

Clinical Research Associate

Arpita joined the SORI team in February 2020, working part-time as a Clinical Research Associate. She is an overseas trained dentist with a master’s degree in public health from University of New South Wales. She has a strong interest in healthcare
research and primarily works at our research rooms in Chatswood. Her primary responsibilities at SORI include clinical data collection from patients attending the clinics, maintaining the patient database and assisting the SORI research team with ongoing projects

Nadia Mazari

Nadia Mazari, BSc

Clinical Research Associate

Nadia has worked as a Clinical Research Associate at SORI since March 2016. She is currently studying a Master of Nutrition and Dietetics at the University of Sydney while working at SORI part-time. Nadia can be seen working across our research rooms with our surgeons in Newtown, Crows Nest and Chatswood.


Over the years, Nadia has been involved with numerous roles at SORI including the maintenance of our database of over 10 000 patients, developing standard operating procedures, and managing patient clinical data. Currently, her primary responsibilities involve clinical data collection, data auditing and supporting the SORI research team with ongoing projects.

Akhmal Hakim

Hakim Ariffin, BEng

Clinical Research Associate - Engineer

Hakim has completed a Bachelor degree (Vanderbilt University, USA) and a Master degree (University of Sydney). Both degrees are on Biomedical Engineering. He is an experienced biomedical engineer who has previously worked for both Canon Medical and St. Jude-Abbott.

At SORI, Hakim is working alongside the clinical research team in maintaining high quality clinical data collection and management. In addition, Hakim is working on computational modelling and analysis of orthopaedic patients data, and also assists in supporting IT resource.

Shane Ball

Shane Ball, PhD

Clinical Research Associate

Shane is a clinical research associate and is responsible for data collection, data auditing and project support.

Shane has completed his PhD in health sciences at the University of Sydney, where his research investigated training and injury in rugby union. Having developed an interest in statistics through his PhD, he is now completing a post-graduate biostatistics degree.

Finance and Administration

Lionel Jeyaraj

Lionel Jeyaraj FCCA, FIPA, FFA

Finance and Administration

Lionel is a member of the Chartered Association of Certified Accountants UK and Institute of Public Accountants in Australia. He brings over 30 years of extensive domestic and international business accounting and advisory services, including eight years in the accounting profession. He has accumulated a wealth of experience in business management, tax accounting and compliance, financial analyses, auditing, statutory and ASX reporting, technology and change management. Lionel is focused on business results and improvement though effective processes, systems, reporting and efficient asset management.

Lionel has industry experience in various capacities ranging from Accountant to CFO encompassing information technology, telecommunications, education, gaming, leisure, research, marketing, venture capital and not for profit organisation.

Current Fellows

George Awwad

Dr George Awwad

Clinical Fellow

Dr George Awwad obtained his medical degree (Bachelor of Medicine and Bachelor of Surgery) from the University of Adelaide from January 2005 to December 2010. He trained to become an Orthopaedic Surgeon with the Australian Orthopaedic Association in the Newcastle Training Scheme from January 2016, and was admitted as a Fellow of the Royal Australian College of Surgeons in Orthopaedic Surgery in February 2021.

He is currently undertaking his fellowship with the Sydney Orthopaedic Research Institute in Knee Surgery, and plans to pursue a career in Sports Knee and Arthroplasty surgery in Adelaide, South Australia, upon completion.

He has participated in several research projects with both the University of Adelaide and University of Newcastle and has presented his research both internationally and nationally. He has also produced 6 publications in peer-reviewed journals and received grants for his research.

Johanna Elliott

Dr Johanna Elliott

Clinical Fellow

Johanna Elliott is an Australian AOA trained Orthopaedic Surgeon who completed her qualifications in Duesseldorf Germany and has been practicing as an Orthopaedic Specialist with a focus on lower limb arthroplasty and trauma for over 12 years. She holds a position on the Ethics Committee for Medical Research at Essen University. She has returned to beautiful Sydney, the city where she was born, to learn the latest technological advances in precision knee surgery. Johanna is in the process of completing her PhD at the University of London and maintains a consultancy position at the EPRD in Berlin (German Arthroplasty Registry). Her general research interest are the public health implications and outcomes of lower limb arthroplasty, with a focus on scientific documentation of advancements in these medical products.