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The role of hamstring has been studied in anterior cruciate ligament (ACL) injury prevention, mainly to counteract the anterior tibial translation , especially when contracting eccentrically, but also with passive stiffness. However, little is known about the passive hamstring stiffness after ACL reconstruction (ACLR).
The primary objective of this study is to evaluate the passive stiffness of hamstring muscles after ACLR by using an isokinetic device. Secondary, we aimed to test the individual and surgical characteristics associated with hamstring stiffness and the impact of hamstring stiffness on RTS and knee re-injury.
The hypotheses are that hamstring stiffness will be lower in the ACLR leg compared to the uninjured leg and to healthy individuals.
Also, we hypothesized that hamstring stiffness will be lower after hamstring autograft compared to patellar tendon autograft and will increase progressively after ACLR to be symmetrical at the time for RTS.
Also, we hypothesized that hamstring stiffness could be associated with better outcomes at RTS (RTS at same level and lower re-injury rates)
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| ACLR group | Patients after ACLR with a standardized followup in the Sport Medicine department | ||
| Control group | Age and sexe-matches volunteers |
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| Measure | Description | Time Frame |
|---|---|---|
| Change in passive hamstring stiffness | Measurement of knee flexors stiffness (in newton.meter per degree, Nm/°) on isokinetic dynamometer. | ACLR group: Two evaluations on both injured and healthy knees: (1) 4 months after surgery and (2) 8 months after surgery; Control group:one evaluation at a single point in time through study completion (an average of one year) |
| Change in Strength | Measurement of knee extensors and flexors peak strength (in newton.meter, Nm) on isokinetic dynamometer. | ACLR group: Two evaluations on both injured and healthy knees: (1) 4 months after surgery and (2) 8 months after surgery; Control group:one evaluation at a single point in time through study completion (an average of one year) |
| Measure | Description | Time Frame |
|---|---|---|
| Individual characteristics | Personal characteristics recorded in the medical report as age, gender, type of sport and sport level of practice and return to sport after the surgery and severe reinjury on the operated knee or contralateral knee. | ACLR group: Two follow-up medical consultations: (1) 4 months after surgery and (2) 2 years after the surgery for return to sport and reinjury; Control group:one evaluation at a single point in time through study completion (an average of one year) |
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Inclusion Criteria:
Exclusion Criteria:
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ACLR group: All patients included in the sport medicine follow-up protocole with isokinetic muscular assessment at 4 months and 8 months after ACL reconstruction surgery since January 2017
Control group: Age- and sexe- matched healthy volunteers with regular sport practice
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| CHU Caen Normandie | Caen | 14000 | France |
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| ID | Term |
|---|---|
| D000070598 | Anterior Cruciate Ligament Injuries |
| ID | Term |
|---|---|
| D007718 | Knee Injuries |
| D007869 | Leg Injuries |
| D014947 | Wounds and Injuries |
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| Surgery characteristics | Surgery characteristics recorded in the medical report as the type of surgery, the surgery duration and tourniquet time | ACLR group only: one follow-up medical consultations at 4 months after surgery |