Zimmer®Patient Specific Instruments
Zimmer Patient Specific Instruments simplify the total knee process from start to finish without compromising surgical decision making, surgical technique, or intra-operative flexibility.
Potential benefits include: advanced preoperative planning, more accurate implant sizing and alignment, reduced instrumentation and fewer intra-operative steps, shorter operating and tourniquet times.
Based upon the clinically proven principles of mechanical axis alignment, Zimmer Patient Specific Instruments use a patient MRI scan to produce custom-made pin guides that conform precisely to the individual patient’s anatomy.
Alignment in total knee arthroplasty remains a crucial factor in the function and longevity of the joint replacement. By combining advancements in instrument technology with proven orthopaedic alignment principles, Zimmer Patient Specific Instruments help to ensure successful outcomes for surgeons and their patients.
The custom pin guides are designed with position stabilising features and anatomical reference lines, including the transepicondylar, mechanical and AP axis to verify positioning, and eliminate variability in pin guide placement. Ensuring accurate pin guide placement means that surgeons and their patients can be confident that the end surgical result matches the preoperative plan.
Surgeon-controlled advanced pre-operative planning
The Zimmer Patient Specific Instruments Planner is the next generation in surgical planning. Using the patients MRI scan, which is converted into a 3D model of the patients lower limb, the Instrument planner allows the surgeon to view the patient’s anatomy in its purest geometrical form. From this information the surgeon is able to develop a customised plan for each patient.
At the click of the mouse, the planning software gives the surgeon the opportunity to make instant decisions about implant selection, implant size, resection depth, femoral rotation, varus/valgus, flexion/extension, and posterior slope. They can then see in real time how these decisions affect the pre-operative plan.
Implant options offered by the Instrument Planner includes the full range of NexGen primary knees, which continues to be the best performing knee according to both the latest Swedish and Australian National Joint Registers.