biodex SYSTEM 4 - Return to Play

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Return to Play
The Anterior Cruciate Ligament Reconstruction Return to Play (ACLR-RTP) report is intended to
provide an easy to understand status of muscle strength with respect to the reconstructed knee
and its un-injured counterpart knee, as well as a comparison to age and gender based goals.
Biodex Isokinetic strength test scores are considered essential objective criteria along with
functional, agility, and psychological readiness testing in the return to play decision. The Biodex
Isometric test report and Isometric testing is typically used in the early phases of ACL
rehabilitation. It obtains muscle strength status while protecting the graft.
The selected report criteria, goals and protocols are based on current literature and have been
reviewed by a consensus of experienced orthopedic sports medicine clinicians.
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Protocols
There is one isometric default protocol with a test angle of 60 degrees. Several Isokinetic test
protocols are based on Isokinetic test speed preference. You can also create a protocol of your
choice with up to three (3) Isokinetic speeds or three (3) Isometric test angles. A protocol can
be marked as Return to Play (RTP) and can be used for Knee, Isokinetic/Isometric, and Bilateral,
can have up to 3 sets and will have a corresponding RTP report.
Goals
Goals are provided for the each of the built-in test protocols using normative data. Goals are
speed, age and gender based. For symmetry, the goal is independent of speed, gender or age.
It is simply comparing one leg to the other.
Symmetry formula = Involved/Uninvolved x 100
NOTE: The Goals for the RTP report are specific to the protocols as described on page 63. The
ability to edit or add custom RTP goals is not available in this release, but will be in the future.
1
Kyritsis P, Bahr R, et al. Likelihood of ACL graft rupture: not meeting six discharge criteria
before return to sport is associated with four times greater risk of rupture. Br J Sports Med:
50:946–951 Published 2016 May 23. doi:10.1136/bjsports-2015-095908
2
Grindem H, Snyder-Mackler L, et al. Simple decision rules can reduce reinjury by 84% after ACL
reconstruction: The Delaware-Oslo ACL Cohort Study. Br. J Sports Med. Published 2016 May
9:50 804-808. doi 10.1136/bjsports-2106-096031
3
Webster K.E., Feller J.A, Development and Validation of a Short Version of the Anterior Cruciate
Ligament Return to Sport after Injury (ACL-RSI) Scale. The Orthopedic Journal of Sports
Medicine, 6(4), 2325967118763763 doi: 10.1177/2325967118763763
4
Anderson M.A., et al, The Relationship among Isometric, isotonic and isokinetic Concentric
and Eccentric Quadriceps and Hamstring Force and Three Components of Athletic Performance.
JOSPT 14:3, 114-120. Published 1991
5
Struzik A. et al, Ratios of torques of antagonist muscle groups in female soccer players. Acta
of Bioengineering and Biomechanics 20:1. Published 2018 doi: 0.5277/ABB-0094-2017-02