1. A case of traumatic aneurysm in the popliteal fossa after a lateral meniscectomy is described.

2. Relevant factors in the surgical anatomy of the inferior genicular artery are discussed.

3. The value and limitations of angiography of the popliteal artery are considered.

4. Treatment is governed by the degree of involvement of the popliteal artery. In the case described cure of the aneurysm was obtained by endo-aneurysmorrhaphy.