Fractured Patella, Anterior View

Description

Anteriorly, the patella (kneecap) lies superficial to the distal femur and centered within the extensor mechanism, with a visible fracture line disrupting the anterior cortical surface and fragmenting the normally convex bone. Superior to the patella, the quadriceps tendon approaches the base; inferiorly, the patellar ligament continues toward the tibial tuberosity, forming a straight midline tether across the front of the knee. Deep to the patella sits the femoral trochlea, and in a reconstructed knee the contoured femoral component and the tibial baseplate with polyethylene insert occupy the distal femur and proximal tibia, with the patella positioned anterior to the prosthetic trochlear flange. Patellar fracture in the setting of total knee arthroplasty carries different implications than a native injury because stability depends on the integrity of the extensor mechanism and the fixation of any patellar resurfacing component. A displaced transverse fracture or comminution can compromise active knee extension, while altered patellar tracking against a femoral component may exacerbate anterior knee pain, crepitus, or accelerated wear of the patellofemoral interface. Operative decisions often hinge on extensor lag, implant stability, and bone stock, making an anterior view the most direct way to communicate fragment pattern and its relationship to the prosthetic knee. Orthopedic educators can use this artwork when teaching periprosthetic patellar fracture classification, extensor mechanism evaluation, and postoperative complication pathways after TKA in arthroplasty or sports medicine modules. It also fits well in surgical atlases, patient-facing consent materials, and clinical presentations comparing native patellar fractures with fractures occurring after resurfacing or altered patellofemoral biomechanics. Anatomical accuracy verified by SciePro's Medical Advisory Board.