A prospective study was performed of 20 consecutive patients with 35 flexor tendon lacerations, in whom post-operative mobilisation was carried out using the Toronto Mobilimb Continuous Passive Motion machine for the first 4½ weeks. Overall the results assessed by Buck Gramcko criteria were 17 (85%) excellent or good, 3 (15%) fair and no poor results. Taking the 17 fingers with zone II lacerations, 14 (82%) were excellent or good, 3 (18%) fair and no poor results.