Tibial fixation is the weak link when using soft tissue grafts and interference screws for fixation in a bony tunnel in ACL reconstruction. The Objective is to study two groups of patients undergoing double loop hamstring autograft ACL reconstruction and compare between the two tibial fixation devices: the tapered Deltascrew and the Intrafix screw and sheath .

Inclusion Criteria:

• Males and females between ages 21 and 40 years.
• Primary ACL tears.
• Signed Informed consent.
• Availability during follow up period.

Exclusion Criteria:

• Additional meniscal injury requiring suture.

• Articular cartilage injury requiring surgical management.

• Concomitant ligament injuries to the same knee requiring surgery.

• Bilateral ACL injury.

• Revision ACL surgery.

• Concurrent fractures of the lower limbs caused by the same accident.

• Post operative wound infection.

  • Post operative nerve injury

• Cardiovascular compromise.

• Professional sports people.

• Soldiers on active military service.

• Patients actively seeking compensation for injury.

• Patients on other research protocols.

• Patients receiving medications which alter bone metabolism: corticosteriods, Calcitonin, Flourides, Biphosphonates, Vitamin D and its derivatives, Cytotoxic drugs.

• Non compliance. • Pregnancy