Information about project titled 'Hamstring Reinjuries Occur at the Same Location and Early After Return to Sport - A Descriptive Study of MRI-Confirmed Reinjuries'
Hamstring Reinjuries Occur at the Same Location and Early After Return to Sport - A Descriptive Study of MRI-Confirmed Reinjuries
| Details about the project - category | Details about the project - value |
|---|---|
| Project status: | Published |
| Project manager: | Arnlaug Wangensteen |
| Supervisor(s): | Johannes Tol, Roald Bahr |
| Coworker(s): | Erik Witvrouw, Robbart van Linschoten, Emad Almusa, Bruce Hamilton |
Description
Background: Despite relatively high reinjury rates after acute hamstring injuries, there is a lack of detailed knowledge about where and when hamstring reinjuries occur, and studies including imaging-confirmed reinjuries are scarce.
Aims: To investigate the location, radiological severity, and timing of reinjuries on magnetic resonance imaging (MRI) compared with the index injury.
Study Design: Case series
Methods: A MRI scan was obtained _5 days after an acute hamstring index injury in 180 athletes, and time to return to sport (RTS) was registered. Athletes with an MRI-confirmed reinjury in the same leg _365 days after RTS were included. Categorical grading and standardized MRI parameters of the index injury and reinjury were scored by a single radiologist (with excellent intraobserver reliability). To determine the location of the reinjury, axial and coronal views of the index injury and reinjury were directly compared on proton density–weighted fat-suppressed images.
Results: In the 19 athletes included with reinjury, 79% of these reinjuries occurred in the same location within the muscle as the index injury. The median time to RTS after the index injury was 19 days (range, 5-37 days; interquartile range [IQR], 15 days). The median time between the index injury and reinjury was 60 days (range, 20-316 days; IQR, 131 days) and the median time between RTS after the index injury and the reinjury was 24 days (range, 4-311 days; IQR, 140 days). More than 50% of reinjuries occurred within 25 days (4 weeks) after RTS from the index injury and 50% occurred within 50 days after the index injury. All reinjuries with more severe radiological grading occurred in the same location as the index injury.
Conclusion: The majority of the hamstring reinjuries occurred in the same location as the index injury, early after RTS and with a radiologically greater extent, suggesting incomplete biological and/or functional healing of the index injury.