Study of Test-retest Reliability of Hip-Knee Joint and Gluteus Maximus-Gluteus Medius Recruitment Coupling Pattern Measures Obtained with Cross Recurrence Quantification Analyses


About this study

The purpose of this study is to examine test-retest reliability of measurements obtained with cross recurrence quantification analysis with respect to (A) dynamic hip-knee motion coupling patterns and (B) gluteus maximus-gluteus medius EMG recruitment coupling patterns during single-limb step-downs.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

Inclusion Criteria:

  • Active, healthy, young adults capable of performing single-leg tasks and free from current lower extremity or back pain.

Exclusion Criteria: 

  • Secondary to the nature of the single-limb squat exercise comprising the primary test in the study, subjects with patellofemoral pain syndrome symptoms (anterior/peripatellar knee pain > 2 on the 11-point pain intensity scale when walking down stairs, squatting, or after prolonged sitting) within 6 months prior to testing or subjects with history of traumatic knee injury (ligament tear, patella dislocation, knee surgery) will be excluded from participating. 
  • Subjects will also be excluded from participating if there is any suspicion of ligamentous injury or meniscal damage. 
  • Signs and symptoms of knee conditions will be screened with a pre-enrollment survey and pre-enrollment testing. 
  • Study personnel will screen subjects for ligamentous instability by performing the Lachman test to assess anterior cruciate ligament integrity, the posterior drawer test to assess posterior cruciate ligament integrity, and valgus and varus thrust tests to assess medial and lateral collateral ligament integrity, respectively. 
  • Study personnel will screen subjects for meniscus pathology by palpating for joint line tenderness and for patella instability by performing a patella apprehension test.


Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status

Rochester, Minn.

Mayo Clinic principal investigator

John Hollman, Ph.D.

Closed for enrollment

More information


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Study Results Summary

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Supplemental Study Information

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