Evidence map›Paper›PMID 25293676›Full record

Trial reportKnee surgery, sports traumatology, arthroscopy : official journal of the ESSKA2016

Increase in ACL and PCL injuries after implementation of a new professional football league.

Werner Krutsch, Florian Zeman, Johannes Zellner, Christian Pfeifer, Michael Nerlich, Peter Angele

Abstract readRandomized Controlled Trial
PubMed Publisher
In one paragraph

Trial report in Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers, 5 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
38citing papers in PubMed, 5 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

38 citing papers in PubMed, 5 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Pooled it
  5. Pooled it
  6. Neuromuscular exercises prevent severe knee injury in adolescent team handball players.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2018
    Trial
  7. Article
  8. Article
  9. Sport-specific differences in ACL injury, treatment and return to sports: Football.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2025
    Review
  10. Article
  11. Article
  12. Article
  13. Article
  14. Smaller intercondylar notch size and smaller ACL volume increase posterior cruciate ligament rupture risk.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2023
    Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Increased occurrence of ACL injuries for football players in teams changing coach and for players going to a higher division.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2022
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Werner KrutschDepartment of Trauma Surgery, University Medical Centre Regensburg, FIFA Medical Centre of Excellence, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany. werner.krutsch@ukr.de.
Florian ZemanCentre for Clinical Studies, University Medical Centre Regensburg, Regensburg, Germany.
Johannes ZellnerDepartment of Trauma Surgery, University Medical Centre Regensburg, FIFA Medical Centre of Excellence, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany.
Christian PfeiferDepartment of Trauma Surgery, University Medical Centre Regensburg, FIFA Medical Centre of Excellence, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany.
Michael NerlichDepartment of Trauma Surgery, University Medical Centre Regensburg, FIFA Medical Centre of Excellence, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany.
Peter AngeleDepartment of Trauma Surgery, University Medical Centre Regensburg, FIFA Medical Centre of Excellence, Franz-Josef-Strauss-Allee 11, 93053, Regensburg, Germany.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeIn the season 2008-2009, a third professional football league was established in Germany. This study analysed the influence of increased training and playing intensity on severe knee injuries in football players.

methodsIn a prospective controlled one-season trial, injury incidence and injury patterns of players of the newly established professional football league were analysed, particularly with regard to ruptures of the anterior (ACL) and posterior (PCL) cruciate ligaments. Players of the highest amateur level served as a control group.

resultsFour hundred and eight players of 24 teams were allocated to two groups. The overall training exposure was significantly (p < 0.001) higher in the new professional league (335.3 h per player) than at the amateur level (286.6 h per player). Players at both levels showed similar overall injury rates and injury patterns. However, players in the professional league had a significantly higher (p = 0.04) incidence of ACL and PCL injuries, than players at the amateur level. More than 90 % of all ACL and PCL ruptures in both groups were sustained by players, who had played at least one level lower in the previous season. In addition, injuries of players who had sustained repeat injuries over the season were more severe.

conclusionThe introduction of a new professional football league increased the training and playing intensity of players as well as the number of ACL and PCL ruptures. A specific injury prevention concept, particularly for players facing rapidly increasing training and playing intensity, seems to be mandatory. LEVEL OF EVIDENCE: Prospective controlled cohort study, Level II.

Indexed as

AdolescentAdultAnterior Cruciate Ligament InjuriesCompetitive BehaviorExerciseGermanyHumansIncidenceMalePosterior Cruciate LigamentProspective StudiesRisk FactorsSoccerYoung AdultACL rupturesInjury preventionInjury severityPCL rupturesProfessional footballSoccer

Identifiers

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.