Rate of Force Application During Knee Arthrometer Testing Affects Stiffness But Not Displacement Measurements
| Autor: | Sandra J. Shultz, Christopher R. Carcia, Steven M Gross, Bruce M. Gansneder |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Adult
Male musculoskeletal diseases medicine.medical_specialty Knee Joint Anterior cruciate ligament Physical Therapy Sports Therapy and Rehabilitation medicine.disease_cause Weight-bearing Weight-Bearing Distal femur medicine Humans Tibial rotation Displacement (orthopedic surgery) Tibia Anterior Cruciate Ligament Range of Motion Articular Orthodontics Orthopedic Equipment business.industry Stiffness Equipment Design Patella General Medicine musculoskeletal system Biomechanical Phenomena Surgery medicine.anatomical_structure Ligaments Articular Stress Mechanical medicine.symptom business Range of motion |
| Zdroj: | Journal of Orthopaedic & Sports Physical Therapy. 34:132-139 |
| ISSN: | 1938-1344 0190-6011 |
| DOI: | 10.2519/jospt.2004.34.3.132 |
| Popis: | Repeated-measures counterbalanced design.To determine the effect of rate of force application on anterior tibial displacement and anterior tibial stiffness when measured with the KT-2000 knee arthrometer.Clinicians and researchers frequently use the KT-2000 to quantify anterior tibial displacement and stiffness. While many factors (ie, tibial rotation, alignment of the arthrometer, etc) have been identified to affect KT-2000 measurements, the effect of the rate of force application has not been studied.Seventeen recreationally active males between the ages of 19 and 36 years (mean age +/- SD, 27.8 +/- 5.3 years) with no previous history of knee injury participated. With the knee in 25 degrees of flexion, the KT-2000 was applied to the participants' anterior tibia. While the distal femur was stabilized, the first author applied a posterior-to-anterior force at a fast and slow rate. Three trials for the slow and fast rates of force application were averaged and used for statistical analysis. Anterior tibial displacement (mm) was measured at 133 N and the related anterior tibial stiffness (N/mm) values were calculated between 89 and 133 N. Separate paired t tests with Bonferroni adjustment were used to determine if differences in displacement and stiffness between rates of force application were present.Stiffness was significantly greater in the slow (mean +/- SD, 58 +/- 22 N/mm) as compared to the fast trials (mean +/- SD, 47 +/- 19 N/mm) (P = .005). Differences in displacement, however, were small and not significant (P = .132) between the slow (mean +/- SD, 3.9 +/- 1.5 mm) and fast (mean +/- SD, 4.0 +/- 1.6 mm) trials.The rate of force application affects anterior tibial stiffness but not anterior tibial displacement when measured with the KT-2000. This suggests that to ensure reliable results when using the KT-2000, the rate of force application must be controlled when measuring stiffness between 89 and 133 N, but not when measuring anterior tibial displacement at 133 N. |
| Databáze: | OpenAIRE |
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