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Ramp Lesion – Causes, Symptoms and Treatment

A ramp lesion is a tear at the posterior root of the medial meniscus where it meets the joint capsule. It frequently occurs alongside anterior cruciate ligament injuries.

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Things worth knowing about "Ramp lesion"

A ramp lesion is a tear at the posterior root of the medial meniscus where it meets the joint capsule. It frequently occurs alongside anterior cruciate ligament injuries.

What is a Ramp Lesion?

A ramp lesion refers to a tear or avulsion at the posterior aspect of the medial meniscus at its junction with the synovial joint capsule of the knee. This region is called the "ramp" because of its sloping transition between the meniscus and the capsule. The injury affects the meniscocapsular junction and is frequently missed on standard MRI scans, which is why it is sometimes referred to as a "hidden lesion" in the orthopedic literature.

Causes

Ramp lesions are typically caused by rotational and shear forces acting on the knee joint. They occur most commonly in association with anterior cruciate ligament (ACL) tears. Studies suggest that ramp lesions are present in up to 24 percent of all ACL injuries.

Sports injuries, particularly in soccer, skiing, and basketball
Sudden twisting movements of the knee under load
Direct trauma to the knee
Hyperflexion or hyperextension of the knee joint

Symptoms

The symptoms of a ramp lesion are often nonspecific and may be confused with other knee injuries. Common complaints include:

Pain in the posteromedial aspect of the knee
Swelling and joint effusion
A feeling of instability or locking of the knee
Pain during deep flexion or rotation of the knee
Load-bearing pain during walking or running

Diagnosis

Diagnosing a ramp lesion is challenging because the affected zone is difficult to visualize on standard MRI. The following diagnostic approaches are used:

MRI of the knee: MRI remains the primary imaging modality. Dedicated sequences, such as coronal and sagittal planes, can improve detection rates. However, a significant proportion of ramp lesions are only identified during surgery.
Clinical examination: Pain provocation tests targeting the posterior knee region may raise suspicion.
Arthroscopy: Diagnostic knee arthroscopy is the gold standard and allows direct visualization of the meniscocapsular zone. It is often combined with surgical repair during the same procedure.

Treatment

Treatment of a ramp lesion depends on the extent of the injury and whether concurrent injuries such as ACL tears are present.

Conservative Treatment

Small, stable lesions without significant instability may be managed conservatively, including:

Rest and partial weight-bearing of the knee
Physiotherapy to strengthen the knee-stabilizing muscles
Ice, compression, and elevation during the acute phase
Anti-inflammatory medications (NSAIDs) for pain relief

Surgical Treatment

Larger or unstable ramp lesions, particularly those associated with ACL reconstruction, are typically repaired arthroscopically using specialized suture techniques to reattach the torn meniscocapsular junction. Simultaneous ACL reconstruction and meniscal repair is now considered the standard of care to ensure long-term knee stability.

Rehabilitation

Following surgical repair, a structured rehabilitation program is required, typically lasting 4 to 6 months. The goals include restoring full range of motion, strengthening the surrounding musculature, and achieving a gradual return to sport.

Prognosis

With early diagnosis and appropriate treatment, the prognosis for a ramp lesion is generally favorable. However, untreated lesions can lead to chronic knee instability and an increased long-term risk of knee osteoarthritis (gonarthrosis). Early surgical intervention significantly improves long-term outcomes.

References

Sonnery-Cottet B. et al. - Ramp Lesions of the Medial Meniscus. Orthopaedic Journal of Sports Medicine, 2019.
Peltier A. et al. - Diagnosis and Treatment of Ramp Lesions in Association with Anterior Cruciate Ligament Tears. Knee Surgery, Sports Traumatology, Arthroscopy, 2021.
Mouton C. et al. - Prevalence and Characterization of Ramp Lesions in ACL-Injured Knees. Knee Surgery, Sports Traumatology, Arthroscopy, 2020.

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