Is a synthetic augmentation in medial open wedge high tibial osteotomies superior to no augmentation in terms of bone-healing?

•Augmentation of osteotomy gap after medial open wedge high tibial osteotomy=MOWHTO•Nineteen patients with synthetic bone graft, 30 patients without augmentation•Bone healing was assessed and compared within the two groups.•Results revealed significant more non-unions in patients with synthetic bone graft.•Recommendation: no use of synthetic bone graft after MOWHTO.