Bent Knee, Lateral View

Description

Shown in lateral profile, a flexed male knee brings the distal femur into close apposition with the proximal tibia, with the femoral condyles rolling posteriorly as the tibial plateau accepts the load. A total knee arthroplasty is represented, with a contoured femoral component capping the distal femur and a tibial baseplate with polyethylene insert seated on the resected tibial plateau. Anterior to the femoral component, the patella region is suggested along the extensor mechanism line, while the tibial tuberosity lies distal and anterior on the shinbone. Flexion changes everything. Flexed, lateral positioning is where prosthetic kinematics become easiest to teach and easiest to scrutinize, because you can judge femoral rollback, posterior condylar offset, and the functional posterior slope of the tibial component in one glance. Surgeons often reference these relationships when balancing the flexion gap and when checking for posterior impingement or limited range after total knee replacement, problems that present as flexion pain, stiffness, or an unstable feeling on stairs. The lateral projection also supports discussion of patellofemoral tracking and anterior knee pain after arthroplasty, even when the patella is not resurfaced. Use this asset in arthroplasty chapters for orthopaedic surgery texts, in preoperative patient education on knee replacement, or as a slide figure for biomechanics teaching on tibiofemoral contact during flexion and extension. It also reads well beside lateral radiographs when explaining component alignment, sizing, and common failure modes such as loosening and polyethylene wear. Anatomical accuracy verified by SciePro's Medical Advisory Board.