Instabilité méniscale par subluxation récurrente de la corne postérieure du ménisque latéral

A young football player presented several episodes of locking knee associated with pain of the lateral compartment while MRI was considered normal. The occurrence of an irreducible blocking requires performing arthroscopy with evidence of instability of the posterior horn of the lateral meniscus. After reviewing the literature, it appears that popliteomeniscal fasciculi play an important role in maintaining the stability of the posterior horn of the lateral meniscus. Disruption of these structures, either by default or rupture leads to hypermobility of the lateral meniscus. Clinical examination is not contributory; at most, one finds a pain when tensioning the posterolateral compartment at the “Figure-4 Test” and hypermobility in internal rotation of the knee. The popliteomeniscal fasciculi can be viewed on the “classic” MRI of the knee. We need to know the search during an episode of locking knee without meniscal lesion. The management is surgical with the aim of preserving the meniscus.