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ORIGINAL RESEARCH

Relationship between Isokinetic Knee Strength and Jump Characteristics Following Anterior Cruciate Ligament Reconstruction

Authors:  Laudner K, Evans D, Wong R, Allen A, Kirsch T, Long B, Meister K

Clinicians are often challenged when making return-to-play decisions following anterior cruciate ligament reconstruction (ACL-R).  Isokinetic strength and jump performance testing are common tools used to make this decision.  Unfortunately, vertical jump performance standards have not been clearly established and many clinicians do not have access to isokinetic testing equipment.  The authors of this article established normative jump and strength characteristics in ACL-R patients cleared by an orthopedic physician to return-to-play and to determine if relationships exist between knee isokinetic strength measurements and jump characteristics described using an electronic jump map system.   The ACL-R group had lower vertical jump capabilities and some bilateral knee strength deficiencies compared to the matched control group.  The ACL-R group also showed several moderate-to-strong positive relationships for both knee extension and flexion strength with several jump performance characteristics, such as single and double leg vertical jump height.  Therefore, the authors concluded that the results indicate that ACL-R patients present with several knee strength and vertical jump differences compared to a matched control group at the time of return-to-play.  Also, ACL-R patient’s performance on an electronic jump mat system is strongly related to isokinetic knee strength measures.  

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