Introduction: The anatomical details and variations of the posterolateral structures in reconstructive surgery of the knee are of the great importance.

Material and method: Regarding to the popliteus muscle, which is the most important structure of the postero-lateral capsuloligamentous complex, we performed the morfological investigation on the 50 knee specimens, by disecting methods. Most important details are recorded on the slides. Results: Despite to the clasic description of popliteal tendon, the adjacent popliteal capsular þbers and popliteomeniscal þbers, we found that the last one was present in 90% of cases, and consist of two bundles: superomedial (ateched to the superior meniscal border) and inferomedial bundle (ateched lateral on the lateral meniscus). Both popliteomeniscal þbers are 2.0–2.5 cm long. In one case (2%) we found the double belly of m. popliteus-M. Popliteus of Graber (1875). In 46 cases (92%) the fabela was present, and then we found clasically described arcuate ligament. Discussion and conclusion: With the arcuate popliteal ligament, m. popliteus and popliteomeniscal þbers play an extremly important funtional role.