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A complication of ACL reconstruction, especially with bone-patella-tendon-bone (BPTB) autografts and allografts, is graft tunnel mismatch. Graft tunnel mismatch occurs when the tibial and/or the femoral tunnel length is improper for the BPTB graft, causing too much or too little of the graft to be in the tibial tunnel at the end of the surgery. The complication with this is that fixation of the graft is possibly compromised.


Perfect ACL uses a mathematical formula to help calculate the proper length of the femoral and tibial tunnel depth for ACL reconstruction. This ACL reconstruction calculator makes it easy to accurately calculate these key variables so that no ACL reconstruction fixation is compromised, and graft tunnel mismatch does not occur. Perfect ACL’s formula is based on current research, recently submitted to an academic peer-reviewed Orthopaedic journal, demonstrating that a lateral X-Ray radiographic landmark, Blumensaat’s Line, is the same length as the native anterior cruciate ligament (ACL). In a prospective study using this formula pre-operatively and intra-operatively a minimal graft tunnel mismatch (<3mm) was demonstrated and this formula was proven to be completely accurate.


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