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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Giphart, J. Erik Peterson, Daniel S. Myers, Casey Woo, Savio L-Y Torry, Michael R. Krong, Jacob P. Shelburne, Kevin B. Steadman, J. Richard |
| Description | Country affiliation: United States Author Affiliation: Torry MR ( Biomechanics Research Laboratory, Steadman Philippon Research Institute, Vail, CO, USA. mtorry@ilstu.edu) |
| Abstract | INTRODUCTION: The six degrees of freedom knee motion during dynamic activities is not well understood. PURPOSE: Biplane fluoroscopy was used to measure the three-dimensional rotations and translations of healthy knees during stiff drop landings and to determine the relationships between three-dimensional rotations and anterior (ATT) and lateral tibial translations (LTT). METHODS: Six males performed stiff drop landings from 40 cm while being filmed using a high-speed, biplane fluoroscopy system. Initial, peak, and excursions for rotations and translations were calculated, and relationships and changes in these variables were assessed ( = 0.05). RESULTS: Knee flexion at contact was 13.9° ± 9.2° (mean ± SD) and increased to a peak of 44.0° ± 17.2° with an excursion of 31.5° ± 14.1°. Knee varus/valgus angle at contact was -0.3° ± 1.8° varus; subjects progressed into a mean peak valgus position of 1.5° ± 0.9° with total excursion of 2.5° ± 0.9°. Four of six subjects landed externally rotated (2.5° ± 3.0°); two landed internally rotated (-4.9° ± 1.5°), yielding a contact angle of -2.4° ± 3.0° of internal rotation, a peak internal rotation of -5.5° ± 6.0°, and excursion of 3.1° ± 5.5°. Peak ATT were 4.3 ± 0.7 mm (excursion = 2.1 ± 0.9 mm), occurring within 50 ms after contact. Peak LTT were 1.5 ± 1.4 mm (excursion = 2.6 ± 1.6 mm). Significant regressions were found between ATT and knee valgus angle (r2 = 0.39, P = 0.006), between LTT and internal rotation (r2 = 0.96, P < 0.0001), and between LTT and knee valgus angle (quadratic, r2 = 0.90, P < 0.0001). CONCLUSION: This study provides a direct correlation between knee valgus angle with knee ATT and LTT during drop landings. |
| ISSN | 01959131 |
| Issue Number | 3 |
| Volume Number | 43 |
| e-ISSN | 15300315 |
| Journal | Medicine & Science in Sports & Exercise |
| Language | English |
| Publisher | Lippincott Williams & Wilkins (on behalf of the American College of Sports Medicine) |
| Publisher Date | 2011-03-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Knee Physiology Adult Biomechanical Phenomena Fluoroscopy Humans Male Range Of Motion, Articular Rotation Journal Article Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Sports Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science |
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