Novo-backed SI-Bone has added $20m to its coffers in a funding round led by Arboretum Ventures that featured all its major existing shareholders.

Si-Bone, a US-based medical device maker backed by pharmaceutical firm Novo, closed a $20m funding round today led by Arboretum Ventures.

All the company’s existing major shareholders returned for the round, SI-Bone said, though it has not specificallly named any of them. Novo was however referred to as a major investor at the time of Si-Bone’s $21m funding round in May 2015.

Founded in 2008, SI-Bone has created a minimally invasive surgical device named iFuse Implant System that treats…