Abstract: Objective To evaluate the clinical outcomes of treating chronic mallet finger deformity by micro arc bone anchor combined with palmaris longus tendon graft. Methods All16 cases suffering from chronic mallet finger deformity were treated by micro arc bone anchors combining with palmaris longus tendon graft to rebuild the insertions of extensor tendon. Functional exercises, regular reviews and functional assessments were started 6 weeks after surgery. Results All the patients were followed up for 4-10 months, no operational infection or foreign body reaction was observed. The X-ray films showed no loose or fell off of micro-anchors. The distal inter-phalangeal joints were stable with excellent in 12 cases, good in 2 cases, passable in 1 case and unsatisfactory in 1 case according to Dargan's method. Conclusion The treatment of chronic mallet finger deformity by micro arc bone anchor combining palmaris longus tendon graft is simple in process and certain in effects. It is a better method to rebuild the insertions of extensor tendon and is worthy to popularize.

Key words: Bone anchor, Palmaris longus tendon, Mallet finger deformity