The MOON Knee ACL Autograft Retear Risk Calculator

If you’ve had or will have ACL reconstruction surgery using an autograft, you can estimate your noncontact retear risk using the Autograft Retear Risk Calculator below.

An autograft is when your ACL is reconstructed using a tendon from your body. Replacement tendons for autografts are taken from the patellar tendon, hamstring or quadriceps. Graft source location is a factor in retear risk.

All Autografts Have Lower Retear Risk than Allografts

In an allograft, the replacement tendon comes from a cadaver. Allografts have a three times higher risk of retear than autografts. The difference in risk is especially significant for young athletes. Many surgeons no longer use allografts for younger athletes.

Knee Laxity Matters

How loose your knee is after injury is called laxity. The higher the degree of laxity, the more the research recommends using your patellar tendon for autograft surgery.

Knee laxity can only be determined by a skilled professional doing a physical examination.

Talk to Your Doctor

The Autograft Retear Risk Calculator is based on MOON Knee Group follow up research at six years after surgery. 

You can use your estimated failure risk in shared decision-making with your medical provider. Note that based on a variety of factors, the recommendation for your surgery can vary from your estimated risk.

ACL Autograft Retear Risk Calculator

To estimate your risk of retearing your surgically reconstructed ACL by autograft, enter your age, weight, height, sex, sport and activity level. This calculator is valid for ages from 14 to 22  and only includes results for ACL autograft using patellar tendon or hamstring. While reconstruction using a quadriceps tendon is growing in use, there is insufficient long-term research to include it in the calculator.

Age (14-22)

Sex

Height and weight

Sport

Please indicate how often you performed each activity in your healthiest and most active state during the last 12 months.

Running

Cutting

Deceleration

Pivoting

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