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Degree Name

PhD (Doctor of Philosophy)


Sport Physiology and Performance

Date of Award


Committee Chair or Co-Chairs

Kimitake Sato

Committee Members

William A. Sands, Satoshi Mizuguchi, Duane Williams


Objective: To explore currently accepted return-to-play tests and a jumps protocol in a single subject design following anterior cruciate ligament reconstruction.

Background: The subject sustained 2 ruptures of the ACL in the left knee in a 12-month period. Both events were noncontact injuries occurring on the landing phase of a jump. A physical exam and magnetic resonance imaging were performed for both injuries by multiple orthopedic surgeons in the United States (1st rupture) and in Brazil (1st & 2nd rupture) to diagnose the injury.

Treatment: Following the initial injury the subject attended 2 rehabilitation sessions per week for 16 weeks with an outpatient physical therapy clinic in the US. After the second surgery the athlete returned to the US and received treatment 6 days per week for 8 months with the University sports medicine staff.

Return-to-play testing: Along with the hop test and an isokinetic knee flexion/extension test as a general protocol to determine the return-to-play, a jumps protocol to assess bilateral asymmetry and performance was also used. The symmetry index score (SI) was used to evaluate the magnitude of asymmetry.

Conclusions: Following ACL reconstruction, objective data from the Hop Test, Isokinetic Test and Jumps Protocol can assist the healthcare provider in determining return-to-play status.

Document Type

Dissertation - restricted


Copyright by the authors.