Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional Athletes
# Background Significant effort has gone into the identification and quantification of the underlying mechanisms of primary ACL injury. Secondary ACL injury is observed in approximately 1/4 to 1/3 of athletes who return to sport following ACL reconstruction. However, little has been done to evaluat...
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| Format: | Article |
| Language: | English |
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North American Sports Medicine Institute
2023-02-01
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| Series: | International Journal of Sports Physical Therapy |
| Online Access: | https://doi.org/10.26603/001c.67775 |
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| _version_ | 1825196984549507072 |
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| author | Manuela Vargas Grace K Chaney María C. Mejía Jaramillo Paige Cummings April McPherson Nathaniel A. Bates |
| author_facet | Manuela Vargas Grace K Chaney María C. Mejía Jaramillo Paige Cummings April McPherson Nathaniel A. Bates |
| author_sort | Manuela Vargas |
| collection | DOAJ |
| description | # Background
Significant effort has gone into the identification and quantification of the underlying mechanisms of primary ACL injury. Secondary ACL injury is observed in approximately 1/4 to 1/3 of athletes who return to sport following ACL reconstruction. However, little has been done to evaluate the mechanisms and playing circumstances surrounding these repeat injuries.
# Hypothesis/Purpose
The purpose of this study was to characterize the mechanisms of non-contact secondary ACL injuries using video analysis. It was hypothesized that in video recordings of secondary ACL injury, athletes would exhibit greater frontal plane hip and knee angles, but not greater hip and knee flexion, at 66 ms following initial contact (IC) as compared to at IC and 33ms following IC.
# Study Design
Cross-Sectional Study
# Methods
Twenty-six video recordings of competitive athletes experiencing secondary ACL ruptures via noncontact mechanisms were analyzed for lower extremity joint kinematics, playing situation, and player attention. Kinematics were assessed at IC as well as 33 ms (1 broadcast frame) and 66 ms (2 broadcast frames) following IC.
# Results
Knee flexion and knee frontal plane angles were greater at 66 ms than IC (p ≤ 0.03). Hip, trunk, and ankle frontal plane angles were not greater at 66 ms than IC (p ≥ 0.22). Injuries were distributed between attacking play (n=14) and defending (n=8). Player attention was most commonly focused on the ball (n=12) or an opponent (n=7). A single-leg landing accounted for just over half of the injuries (54%), while a cutting motion accounted for the remainder of the injuries (46%).
# Conclusion
Secondary ACL injury was most likely to occur during landing or a sidestep cut with player attention external to their own body. Knee valgus collapse combined with limited hip motion was identified in the majority of secondary injuries.
# Level of Evidence
Level IIIb |
| format | Article |
| id | doaj-art-05ed0353df2f465b8887869f7942d10b |
| institution | Kabale University |
| issn | 2159-2896 |
| language | English |
| publishDate | 2023-02-01 |
| publisher | North American Sports Medicine Institute |
| record_format | Article |
| series | International Journal of Sports Physical Therapy |
| spelling | doaj-art-05ed0353df2f465b8887869f7942d10b2025-02-11T20:28:07ZengNorth American Sports Medicine InstituteInternational Journal of Sports Physical Therapy2159-28962023-02-01181Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional AthletesManuela VargasGrace K ChaneyMaría C. Mejía JaramilloPaige CummingsApril McPhersonNathaniel A. Bates# Background Significant effort has gone into the identification and quantification of the underlying mechanisms of primary ACL injury. Secondary ACL injury is observed in approximately 1/4 to 1/3 of athletes who return to sport following ACL reconstruction. However, little has been done to evaluate the mechanisms and playing circumstances surrounding these repeat injuries. # Hypothesis/Purpose The purpose of this study was to characterize the mechanisms of non-contact secondary ACL injuries using video analysis. It was hypothesized that in video recordings of secondary ACL injury, athletes would exhibit greater frontal plane hip and knee angles, but not greater hip and knee flexion, at 66 ms following initial contact (IC) as compared to at IC and 33ms following IC. # Study Design Cross-Sectional Study # Methods Twenty-six video recordings of competitive athletes experiencing secondary ACL ruptures via noncontact mechanisms were analyzed for lower extremity joint kinematics, playing situation, and player attention. Kinematics were assessed at IC as well as 33 ms (1 broadcast frame) and 66 ms (2 broadcast frames) following IC. # Results Knee flexion and knee frontal plane angles were greater at 66 ms than IC (p ≤ 0.03). Hip, trunk, and ankle frontal plane angles were not greater at 66 ms than IC (p ≥ 0.22). Injuries were distributed between attacking play (n=14) and defending (n=8). Player attention was most commonly focused on the ball (n=12) or an opponent (n=7). A single-leg landing accounted for just over half of the injuries (54%), while a cutting motion accounted for the remainder of the injuries (46%). # Conclusion Secondary ACL injury was most likely to occur during landing or a sidestep cut with player attention external to their own body. Knee valgus collapse combined with limited hip motion was identified in the majority of secondary injuries. # Level of Evidence Level IIIbhttps://doi.org/10.26603/001c.67775 |
| spellingShingle | Manuela Vargas Grace K Chaney María C. Mejía Jaramillo Paige Cummings April McPherson Nathaniel A. Bates Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional Athletes International Journal of Sports Physical Therapy |
| title | Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional Athletes |
| title_full | Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional Athletes |
| title_fullStr | Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional Athletes |
| title_full_unstemmed | Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional Athletes |
| title_short | Video Analysis of 26 Cases of Second ACL Injury Events in Collegiate and Professional Athletes |
| title_sort | video analysis of 26 cases of second acl injury events in collegiate and professional athletes |
| url | https://doi.org/10.26603/001c.67775 |
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