[Medium- to long-term follow-up after anterior cruciate ligament rupture and repair in healing response technique].

Background: Healing response (HR) is an all-arthroscopic technique for treatment of acute proximal anterior cruciate ligament (ACL) tears within 6 weeks after injury. By means of arthroscopically controlled microfracture holes in the native femoral attachment and perforations of the ACL itself the exit of stem cells and growth factors is induced and the ligament can heal into its native attachment zone. The purpose of the study was to document medium- to long-term results after 5 years or longer following the healing response (HR) procedure.