An in-vivo test with New Zealand rabbit was done to analyse the influence of various post-operative rehabilitative exercises on the tensile strength of the interfascial healing tissue between bone and tendon. Three different post-operative exercises were included in this study and they are cast immobilization, cage activity, and continuous passive movement. The result revealed that the maximal tensile strength of the interfascial healing tissue at the 15th post-operative day was 0. 875kg in cage activity group, 2.014kg in cast immobilization group, and 2. 63kg in continuous passive motion group. The continuous passive motion group had the best maximal tensile strength. The cast immobilization group also had high maximal tensile strength, bu massive intracapsular adhesive tissue also observed in this group.