Component malrotation is an unintended rotational misalignment of an implanted knee replacement part. It most commonly refers to femoral or tibial component rotation after total knee arthroplasty (knee replacement). It can affect how the kneecap tracks and how the knee feels during walking, stairs, or bending. Clinicians use the term when evaluating pain, stiffness, instability, or patellar symptoms after surgery.

Tibial rotation is the turning of the shin bone (tibia) relative to the thigh bone (femur) at the knee. It includes internal rotation (turning inward) and external rotation (turning outward). It is a normal part of walking, squatting, and changing direction. Clinicians use the term to describe knee motion, knee stability, and alignment in injuries and arthritis.

Femoral rotation describes how the thigh bone (femur) turns inward or outward around its long axis. It can refer to a normal movement during walking, squatting, or pivoting, or to a measurable alignment pattern. Clinicians use it to discuss hip-to-knee mechanics, patellar (kneecap) tracking, and overall lower-limb alignment. It is commonly referenced in orthopedics, sports medicine, and physical therapy when evaluating knee and hip symptoms.

Posterior tibial slope is the backward tilt of the top surface of the tibia (shinbone) where it meets the femur (thighbone). It is a measurable alignment feature of the knee, not a diagnosis by itself. Clinicians most often discuss it when reading knee imaging or planning ligament and knee replacement surgeries. In plain terms, it describes how “angled” the upper tibia is from front to back.

Tibial slope is the tilt of the top of the shinbone (tibia) when viewed from the side. It describes how the tibial plateau (the tibia’s joint surface) angles relative to the bone’s shaft. It is commonly measured on knee X-rays and MRI scans. Clinicians consider it when evaluating ligament injuries and planning certain knee surgeries.

Patellar button sizing is the process of selecting the most appropriate size and thickness of a patellar implant (“button”). It is most commonly discussed during total knee arthroplasty (total knee replacement) when the patella is resurfaced. The goal is to match the implant to the patient’s patella and overall knee mechanics. It is a surgical decision step rather than a stand-alone treatment.

Tibial baseplate sizing is the process of choosing the correct size of the tibial baseplate implant used in knee replacement surgery. The tibial baseplate is the metal platform that sits on top of the shinbone (tibia) and supports the plastic bearing surface. Sizing aims to match the implant to a person’s bone shape to help the knee move smoothly and feel stable. It is most commonly discussed in total knee arthroplasty (total knee replacement) and revision knee replacement planning.

Femoral component sizing is the process of selecting the appropriate size and fit of the femoral implant used in knee replacement surgery. It focuses on matching the implant to the patient’s distal femur (the end of the thighbone that forms the top of the knee joint). It is commonly used in total knee arthroplasty (TKA) and, in some cases, partial knee replacement procedures. The goal is to help the artificial joint move smoothly and feel stable during everyday activities.

Periprosthetic fracture after TKA means a bone break that happens around a knee replacement implant. It usually involves the femur (thighbone), tibia (shinbone), or patella (kneecap) near the prosthesis. It is most commonly discussed in orthopedic clinics, emergency settings, and post-surgical follow-ups. The term helps clinicians describe the injury and plan treatment based on implant stability and bone quality.

MUA knee means **manipulation under anesthesia** of the knee joint. It is a technique used to improve knee motion when stiffness limits bending or straightening. It is most commonly discussed after **knee surgery**, especially knee replacement, but can be used in other settings. The goal is to address motion loss related to scar tissue and tight joint structures.