Cystic change subchondral is a descriptive imaging term for small, fluid-like cavities in bone just under joint cartilage. It is most commonly mentioned in X-ray, MRI, or CT reports of the hip, knee, and other weight-bearing joints. It is usually a *finding* that helps describe joint wear or related bone stress rather than a diagnosis by itself. Clinicians use it to understand severity, likely causes, and next steps in evaluation.

Culture and sensitivity is a laboratory test used to find germs (usually bacteria) that may be causing an infection. A “culture” grows the organism from a patient sample so it can be identified. A “sensitivity” test checks which antibiotics are more likely to work against that organism. In orthopedics, it is commonly used when a hip joint, surgical site, bone, or implanted hardware may be infected.

Cup inclination is the angle of the acetabular “cup” component in a total hip replacement. It describes how “open” the cup faces when viewed on imaging, usually an X-ray. Clinicians use it to document implant position and to help interpret hip symptoms after surgery. Cup inclination is most commonly discussed in total hip arthroplasty (hip replacement) planning and follow-up.

Cup anteversion is the forward rotation angle of the acetabular “cup” in a hip replacement. It describes how the socket component is oriented within the pelvis. It is commonly discussed in total hip arthroplasty (THA) planning, surgery, and follow-up imaging. Clinicians use it to help explain stability, motion, and dislocation risk in general terms.

Crutches are mobility aids that help a person walk when one or both legs cannot fully bear weight. They are commonly used after injury, surgery, or during flare-ups of painful joint conditions. Crutches shift some body weight from the legs to the arms and upper body. They are widely used in orthopedics, sports medicine, emergency care, and rehabilitation.

Crescent sign is an imaging finding that looks like a curved, crescent-shaped line just beneath a joint surface. In orthopedics, it is most commonly discussed in the hip as a radiographic sign of femoral head avascular necrosis (AVN). It is used by clinicians and radiologists to help recognize structural weakening of bone near the articular surface. The term shows up mainly in X-ray interpretation, and sometimes in CT or MRI discussions for context.

CT pelvis is a type of medical imaging that creates detailed cross-sectional pictures of the pelvis using X-rays and computer processing. It is commonly used in emergency care, orthopedics, and general medicine to evaluate bones, joints, and nearby organs. A CT pelvis can be performed with or without IV contrast, depending on the clinical question. The goal is to help clinicians see structures that may not be clear on a standard X-ray.

CT hip is a computed tomography (CT) scan focused on the hip joint and nearby bones and soft tissues. It uses X-rays and computer processing to create detailed cross-sectional images. It is commonly used in emergency care, orthopedics, and preoperative planning to evaluate hip pain or injury. It may be performed with or without intravenous (IV) contrast, depending on the clinical question.

CT arthrogram hip is a CT scan of the hip performed after contrast dye is placed directly into the hip joint. It is designed to outline the inside of the joint so small tears or defects are easier to see. It is commonly used in orthopedics and sports medicine when hip pain suggests labrum or cartilage injury. It is also used when MRI is not possible or when CT detail is preferred.

CT acetabulum refers to a CT scan focused on the acetabulum, the cup-shaped socket of the hip joint. CT stands for computed tomography, an imaging method that uses X-rays to create detailed cross-sectional pictures. It is commonly used to evaluate hip socket bone anatomy, fractures, and surgical planning. It may also be used after surgery to assess hardware position or bone healing.