Is There a Correlation Between Surgical Technique for Primary Anterior Cruciate Ligament Surgery and the Risk of Subsequent Formation of Fibrous Cyst (Cyclops) in the Knee Joint, Which Leads to the Need for Surgical Removal of the Cyclops?

Is There a Correlation Between Surgical Technique for Primary Anterior Cruciate Ligament Surgery and the Risk of Subsequent Formation of Fibrous Cyst (Cyclops) in the Knee Joint, Which Leads to the Need for Surgical Removal of the Cyclops? A Registry Study With Patients Operated on With Cruciate Ligament Reconstruction at Aarhus University Hospital From 2005-2019.

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT05301686

Enrollment

2556

Registered

2022-03-31

Start date

2021-10-01

Completion date

2023-01-01

Last updated

2023-01-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Cyclop Arthrofibrosis Anterior Cruciate Ligament

Brief summary

Fibrous scar tissue formation (Cyclops) after a primary anterior cruciate ligament reconstruction (ACLr) may affect patients' ability to perform work and exercise to such an extent that further arthroscopic surgery may be necessary. The purpose of the study is to estimate the 2-year incidence of removal of cyclops lesion after ACLr for a cohort of approximal 3000 patients operated at Aarhus University Hospital in the period 2005-2019. Specifically, change in surgical technique and graft choice will be analyzed.

Interventions

PROCEDUREPatients with Cyclop lesion

Arthroscopy with resection of Cyclop formation

Study design

Observational model

COHORT

Time perspective

OTHER

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Inclusion criteria

* Patient \>18 years * Primary ACL reconstruction

Exclusion criteria

* Multiligament reconstruction * Revisions * ACL reconstruction with double bundle graft

Design outcomes

Primary

Measure	Time frame	Description
Cyclop lesion	2 years	Incidence of Arthroscopy with removal of Cyclop formation

Countries

Denmark

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026