The Morel-Lavallée lesion is a closed internal soft-tissue degloving injury. 
About 15.7% of Morel-Lavallée lesions occur in the knee region. Morel-Lavallée 
lesions are considered chronic when the lesion contains a capsule. The capsule 
prevents resorption of the fluid content, and the lesion will recur when using 
conservative treatment alone. Surgical debridement with resection of the capsule 
is a more definitive treatment option, but it may induce wound complications. In 
this Technical Note, the technical details of endoscopic resection of chronic 
Morel-Lavallée lesion of the knee are discussed. This minimally invasive 
technique has the advantage of better cosmetic results and fewer wound 
complications.