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Bone marrow edema of the knee: a narrative review
Eleonora Villari1, Vitoantonio Digennaro2, Alessandro Panciera2
11st Orthopaedic and Traumatologic Clinic, IRCCS Istituto Ortopedico Rizzoli, Via G.B. Pupilli 1, Bologna, 40136, Italy. eleonora.villari@ior.it.
Abstract:
Bone marrow edema (BME) is a frequent MRI finding in patients with knee pain. According to the etiology, BME of the knee can be classified into three main categories: ischemic, mechanic, and reactive. The diagnosis may be difficult, because of the specificity of symptoms and the poor radiographic findings. MRI is the gold standard, showing an area of altered signal of the bone with an high signal intensity on fat-suppressed, T2 weighted images, usually in combination with an intermediate or low signal intensity on T1 weighted images. Bone marrow edema tends to be self-limiting and, in most cases, resolves without any consequences in a varying amount of time. However, since it may evolve to complete joint destruction, early diagnosis and correct treatment are crucial to prevent the articular degeneration. Conservative therapy is the first step, with no weight-bearing for 3 to 6 weeks on the affected side, in combination with the administration of anti-inflammatory drugs or painkillers to manage symptoms. In non-responding forms and more advanced stages, minimally invasive preservative surgery can provide significant results, with subchondroplasty and core decompression being the two main procedures available. Knee arthroplasty, both total (TKA) or unicompartmental (UKA), is the only effective option when the degradation of cartilage is diffuse and in patients with subchondral bone collapse.
Insights
Bone marrow edema (BME) is a common MRI finding in knee pain. Early diagnosis and treatment are vital to prevent joint destruction, with options ranging from conservative care to surgery.
Area of Science:
- Orthopedics
- Radiology
- Sports Medicine
Background:
- Bone marrow edema (BME) is a frequent MRI finding in patients presenting with knee pain.
- Diagnosis can be challenging due to non-specific symptoms and limited radiographic findings.
- BME is classified by etiology into ischemic, mechanic, and reactive categories.
Purpose of the Study:
- To review the diagnostic modalities and treatment strategies for knee bone marrow edema.
- To emphasize the importance of early diagnosis and intervention for knee BME.
- To outline the progression of treatment from conservative measures to surgical options.
Main Methods:
- Magnetic Resonance Imaging (MRI) is the gold standard for diagnosing BME.
- MRI reveals characteristic signal alterations in bone marrow on T1 and T2 weighted images.
- Review of current literature on BME classification, diagnosis, and management.
Main Results:
- Bone marrow edema is typically self-limiting but can progress to joint destruction.
- Conservative treatment involves rest and anti-inflammatory medication.
- Minimally invasive surgery (subchondroplasty, core decompression) and knee arthroplasty are options for refractory or advanced cases.
Conclusions:
- Early and accurate diagnosis of knee BME using MRI is crucial.
- A stepwise treatment approach, starting conservatively and progressing to surgical interventions if necessary, is recommended.
- Timely management can prevent articular degeneration and preserve joint function.
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