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Popliteal cysts: a reassessment using magnetic resonance imaging
J R Fielding1, P D Franklin, J Kustan
1Department of Radiology, Boston University Medical Center, Massachusetts.
Abstract:
The advent of magnetic resonance imaging (MRI) prompted the reevaluation of the incidence of popliteal cyst and its associated injuries. We reviewed more than 1000 consecutive MRI examinations of the knee performed on patients referred for evaluation of internal derangement. We report a 5% incidence of popliteal cyst, which is lower than has previously been determined. We believe that the reported higher incidence was due to arthrographic distention of normal, collapsed bursae. The strong association between popliteal cyst and tear of the medial meniscus is confirmed. We report for the first time to our knowledge the 13% association between popliteal cyst and complete tear of the anterior cruciate ligament.
Insights
Magnetic resonance imaging (MRI) revealed a 5% incidence of popliteal cysts, lower than previously thought. Popliteal cysts are strongly linked to medial meniscus tears and, for the first time, anterior cruciate ligament tears.
Area of Science:
- Orthopedics
- Radiology
- Sports Medicine
Background:
- Popliteal cysts are fluid collections behind the knee.
- Previous incidence estimates may be inflated due to arthrography.
- Magnetic resonance imaging (MRI) allows for detailed knee joint visualization.
Purpose of the Study:
- To determine the incidence of popliteal cysts using MRI.
- To reevaluate the association between popliteal cysts and meniscal or ligamentous knee injuries.
Main Methods:
- Retrospective review of over 1000 knee MRI examinations.
- Patients were referred for evaluation of internal knee derangement.
- Analysis of popliteal cyst presence and associated meniscal and ligamentous tears.
Main Results:
- A 5% incidence of popliteal cysts was observed.
- A strong association between popliteal cysts and medial meniscus tears was confirmed.
- A 13% association between popliteal cysts and complete anterior cruciate ligament tears was identified.
Conclusions:
- The actual incidence of popliteal cysts is likely lower than previously reported.
- Popliteal cysts are significantly associated with medial meniscus tears.
- Popliteal cysts are also associated with complete anterior cruciate ligament tears, a novel finding.