Constrained condylar knee is a type of knee replacement implant design. It adds extra mechanical stability compared with standard total knee implants. It is most commonly used in complex primary total knee arthroplasty and revision knee replacement. Its goal is to help the knee stay aligned and stable when ligaments or bone support are limited.

CR knee most commonly means a **cruciate-retaining** knee replacement design. It is used in **total knee arthroplasty (knee replacement)** to preserve the **posterior cruciate ligament (PCL)**. The goal is to replace worn joint surfaces while keeping part of the knee’s native ligament system. You will see CR knee discussed in orthopedic surgery notes, implant catalogs, and knee replacement planning.

A Cruciate-retaining knee is a type of total knee replacement design that keeps the posterior cruciate ligament (PCL) intact. It is used to replace worn joint surfaces while preserving one of the knee’s central stabilizing ligaments. It is most commonly discussed in the context of total knee arthroplasty (TKA) for arthritis-related pain and stiffness. It is one option among several implant designs chosen to match a patient’s anatomy and ligament function.

PS knee most commonly refers to a **posterior-stabilized (PS) total knee replacement design**. It is a type of knee implant used in **total knee arthroplasty (TKA)** to help stabilize the joint. In simple terms, it uses a built-in mechanical feature to replace the function of a key ligament. It is commonly discussed in orthopedic surgery planning for knee arthritis and complex knee instability.

Posterior-stabilized knee is a design type used in total knee replacement implants. It is intended to improve knee stability and motion when a key ligament is not preserved. It is most commonly discussed in the context of knee arthritis and knee arthroplasty planning. It uses a mechanical feature inside the implant to help guide the knee as it bends.

Hybrid fixation TKA is a total knee arthroplasty (knee replacement) technique that uses more than one fixation method to secure the implant. Most commonly, one major component is fixed with bone cement while another is designed for cementless “press-fit” fixation. It is used in knee replacement surgery for arthritis and other conditions that damage the knee joint surfaces. The goal is a stable implant now, with durable attachment to bone over time.

Cementless TKA is a type of total knee arthroplasty (total knee replacement) that uses implants designed to attach to bone without bone cement. It relies on bone growing onto or into a porous implant surface for long-term fixation. It is commonly used for knee arthritis and other joint conditions when a full joint replacement is indicated. It is performed in hospitals and surgical centers by orthopedic surgeons.

Cemented TKA is a type of total knee arthroplasty where the implant is fixed to bone using surgical “bone cement.” It is used to replace damaged knee joint surfaces to improve function and reduce symptoms from advanced joint disease. It is commonly performed for knee arthritis when other options no longer provide adequate relief. The “cement” is typically a medical-grade acrylic material that hardens quickly to secure the components.

PSI guides are patient-specific surgical guides made to match an individual person’s bone shape. They are most commonly used in knee surgery, especially knee replacement and some realignment procedures. They are planned using preoperative imaging (often CT or MRI) and then manufactured to fit the patient. Their goal is to help the surgeon place instruments and bone cuts in the intended position.

Patient-specific instrumentation is a set of custom-made surgical guides designed for one individual patient. It is most commonly used in knee replacement and knee realignment surgeries to help position bone cuts and implants. The guides are created from preoperative imaging, such as CT or MRI scans, combined with digital surgical planning. The goal is to match the instruments to a person’s anatomy rather than relying only on standard, “one-size” tools.