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The team


Principal Investigator

Röhrl, Stephan M.

Ass. professor at Ullevål University Hospital and a very experienced senior consultant for hip and knee surgery. He is the project leader of the Intraks study, a well known researcher, head of CIRRO at Ullevål University Hospital, head of the hip and knee sociey in Norway and board member of the Norwegian arthroplasty registry. 

MD at the Ludwig Maximilian University in Münich, Germany 1994.

Phd at the University of Umeå in Sweden 2004. 

He has supervised several PhD students, writen book chapters and hold several lectures.  


Project Manager

Hansen, Vinjar Brenna

PhD candidate and consultant spine surgent at Haukeland University Hospital in Bergen. Born in 1977, from Vaset in Valdres, Norway. MD from Christian Albrechts Universität zu Kiel in Germany 2007. Registrar in Neurosurgery and Orthopedics in Germany,  Ortopedics in Lillehammer and Ullevål University Hospital. A specialist in Ortopedic surgery 2017.  


Hellum, Christian 

Christian studied medicine at the University of Cologne in Germany and graduated with a MD in 1991. He continued his career in Norway, finally arriving at Ullevål University Hospital in Oslo where he soon became a chief ortopedic surgeon of the spine departement. The thesis: "Patients with chronic low back pain and degenerative disc; effects of surgery with disc prosthesis versus rehabilitation, predictors of treatment outcome and health economic considerations", made him the accreditation of PhD in 2013. His a active researcher, author and co-author of  several peer-review articles in highly rated Journals, organizing several academic events and lecturing on a national and international arena.  

Austevoll, Ivar

Chief Ortopedic Spine Surgent at Haukeland University Hospital and Kysthospitalet in Hagavik.

An active researcher in spine surgery, author and co-author of several peer-review articles in highly rated Journals. 

Marit Fure

Special physiotherapist

Department for physiotherapy Rikshospitalet Oslo

Creator of the non-surgical training program for the INTRAKS study. 


Otsuki, Bungo

A MD from the Kyoto University Hospital in 1997 and PhD in 2007. Resident at the Kyoto university Hospital and Kyoto National Hospital 1997, now a senior consultant and Ass. Professor at the Kyoto University Hospital in Japan. A active researcher, author and co-author of several article in highly rated per-review Journales. 


Shimizu, Takayoshi

Ass. Professor at the Kyoto University Hospital. Author and co-author of several articles in highly rated per-review Journals. 




Tsukanaka, Masako


Chief orthopedic surgeon at Shiga Medical Center for children. 

She has vast experience in the treatment of scoliosis. In 2016 - 2018 she was a research fellow at Center for Implant and Radiostereometric Research Oslo at the Oslo university hospital in Norway. During that time she has conducted several RSA study and work with the Norwegian arthroplasty registry. She is a renownd expert on in vivo motion analysis.


Ikeda, Norimasa MD at Kyoto University Hospital and

Intraks study PhD Candidate.



Sigmundsson, Freyr Gauti


Chief ortopedic doctor at Örebro University Hospital.

Freyr Gauti Sigmundsson is the leading Spine Surgeon at the Spine Unit at The Department of Orthopedics, Örebro University Hospital.  Freyr Gauti studied Medicine at the University of Southern Denmark in Odense and graduated in 2005. Freyr Gauti did his specialist training in orthopedics in Iceland and in Sweden. In 2011 he moved to Skane and did his sub-speciality training in Spine Surgery in Lund and Malmö. Freyr Gauti defended his thesis "Determinants of outcome in lumbar spinal stenosis surgery" in 2014. In 2019 Freyr Gauti was recruited to Örebro University Hospital to develop advanced spinal surgery in Swedens youngest University Hospital.


Strömqvist, Fredrik

Md, PhD

Consultant ortopedic surgeon at Malmö University Hospital in Sweden. 



Marte Traae Magnusson

INTRAKS Study Coordinator at

Ullevål University Hospital in Oslo.

Physiotherapist and experienced research coordinator

specialist in orthopedic PT, MSc.


Maria V. Rieber-Mohn

INTRAKS Study Coordinator at

Haukeland University Hospital in Bergen.

A dedicated nurse at the spine departement with a master degree from her work on spinal metastasis.

Ellen Terese Nilsen

User representative for the INTRAKS Study

A member of the "Akershus Ryggforening"/Spine society

Ellen is a scoliosis patient herself and knows have to deal with the ups and downs of spinesurgery.

Translated in to Japanese 

Kumiko Yasuda-Mocek

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