Figure 1. Repair condition grade assessed by MRI.

(a) Case 8: male 61 years old; the ACL, which was damaged and loose before treatment, regains continuity and tension four months later, and in addition, the ligament is considered to have a good grade 0 repair with low signal.

(b) Case 1: female 21 years old; the ACL, which was torn before treatment, regained continuity after four months, and the repaired ACL was firm and thick but also showed high-signal areas and was considered to have a grade 1 repair.

(c) Case 9: female 17 years old; the ACL, which was torn before treatment, regained continuity after 4 months, but the repaired ACL was thin and considered to have a grade 2 repair.

ACL: anterior cruciate ligament