In early 2019 Cristiani et al published an article showing < 20% of patients met rehabilitation goals of having > 90% limb symmetry in strength (isokinetic quads and hamstrings at 90deg/sec) and single hop for distance tests at 6 months post-op.
This study had a very large sample size (4093 patients), comprising 45.7% females, with a mean age of 28 years (+/-10 years). 86.5% of participants completed the full test battery at 6 months post-op.
Wellsandt et al (2017) Limb Symmetry Indexes Can Overestimate Knee Function After Anterior Cruciate Ligament Injury
Comparison between single leg hop and quad strength – in two different ways.
Who - Non professional cutting athletes, 14-55 yrs old(Excluded other significant injuries).
Limb Symmetry Index (LSI) = comparison between Left and Right during an assessment.
Estimated pre-injury capacity (EPIC) = measuring uninvolved limb pre-operatively then comparing to the involved side at 6 months post-op.
SUMMARY
Summary
For every 10% loss of HS/Quads ratio = 10.6 x likelihood of graft rupture
This ratio is increased if quadriceps strength is not fully regained to pre operative level
Meeting the 6 criteria - 116 athletes Discharged (73%) – (12/116 had a graft rupture) = 10%
