LIVing Donor Allograft for Anterior Cruciate Ligament Reconstruction Study

Inclusion Criteria: * Patients aged 8 to 17 years inclusive and have a clinically and radiologically confirmed ACL rupture that requires reconstruction. * Patients who have had previous surgery for meniscal pathology . * Patients with current meniscal pathology * The child and their responsible adult are in agreement with the choice to undergo anterior cruciate ligament reconstruction using living donor allograft. * Donors has not previously undergone tendon harvest on the chosen donor limb * Patients are willing to attend follow up appointments and agree to fill in knee questionnaires and allow instrumented knee ligament testing. Exclusion Criteria: * Patients who have previously undergone ACL surgery on the same limb (and therefore require revision surgery) * Patients who are immunosuppressed, or receiving immunosuppressive therapy * Patients who are unable to attend follow-up appointments for continued research purposes. * Donors who have previously undergone hamstring tendon surgery on the donor limb * Patients and donors who have a positive screening blood test for any of the transmissible infections tested * Donors whose answers to the 'Donor Documentation Questionnaire' indicate that there could be a risk of transmissible infection, may not included * Donors who are not considered healthy enough to undergo a tenotomy under General anaesthetic