Knee Joint, Posterior View

Description

Posteriorly, the distal femur is presented with the medial and lateral femoral condyles draped by the posterior capsule, meeting the tibial plateau inferiorly and the fibular head on the posterolateral side. The popliteal fossa occupies the central interval between the biceps femoris laterally and the semimembranosus and semitendinosus medially, with the medial and lateral heads of gastrocnemius forming the inferior border. Within that fat-filled space, the popliteal artery lies deepest against the femur, the popliteal vein sits superficial to it, and the tibial nerve is most superficial; the common fibular (peroneal) nerve tracks along the biceps femoris tendon toward the fibular neck. Surface landmarks remain readable. Posterior knee anatomy matters because the neurovascular bundle and the posterior cruciate ligament share a tight corridor that becomes unforgiving in trauma and surgery. A posteriorly directed tibial translation in a “dashboard” injury can load the PCL while the popliteal artery, tethered proximally at the adductor hiatus and distally at the soleal arch, faces intimal injury even when distal pulses seem present at first exam. Popliteal (Baker) cysts, distensions of the gastrocnemius-semimembranosus bursa, also declare themselves here and can mimic deep venous thrombosis when they rupture into the calf. Orthopaedic and sports medicine courses use this perspective to teach the popliteal fossa boundaries, PCL examination logic, and safe zones for posterior approaches and arthroscopy portals. It also fits operative notes and patient education materials on knee dislocation, popliteal artery assessment, and common fibular nerve vulnerability near the fibular neck, as well as radiology teaching files that correlate posterior surface landmarks with ultrasound or MRI of a suspected Baker cyst. Anatomical accuracy verified by SciePro's Medical Advisory Board.