Pelvic inlet is the upper opening of the bony pelvis that leads into the pelvic cavity. It is defined by a ring of bone called the pelvic brim. Clinicians use it as an anatomic reference in imaging, trauma care, and surgical planning. It is also discussed in childbirth-related pelvic measurements and general pelvic anatomy.

Pelvic girdle is the ring-like structure at the base of the spine that connects the trunk to the legs. It includes the hip bones and their joints with the sacrum, forming a stable platform for movement and load transfer. Pelvic girdle is commonly discussed in orthopedics, sports medicine, physical therapy, and obstetrics when evaluating hip-area pain. It is also a key landmark in imaging, surgery, and rehabilitation planning.

Pelvic brim line is an anatomic and imaging term related to the rim of the pelvic inlet. It helps clinicians describe pelvic shape, alignment, and certain patterns of injury. In everyday practice, it is most commonly referenced when reading pelvic X-rays and CT scans. It can also be discussed in anatomy and in conditions that affect the hip socket (acetabulum).

Pelvic brim is the bony rim that outlines the entrance to the “true pelvis” inside the pelvic ring. It is an anatomic boundary that separates the upper pelvis from the lower pelvis. Clinicians use it as a landmark on exams, X-rays, CT scans, and surgical planning. It is also referenced in obstetrics and in descriptions of pelvic and acetabular (hip socket) injuries.

A Pelvic binder is a wraparound medical device used to compress and stabilize the pelvis. It is most commonly used in emergency and trauma care when a pelvic ring injury is suspected. It can also be used in hospital settings while clinicians evaluate bleeding risk and fracture stability. In plain terms, it “holds the pelvis together” temporarily to limit motion and reduce pelvic volume.

Pelvic apophyseal avulsion is an injury where a small piece of bone is pulled away from the pelvis by a tendon or muscle. It most often affects adolescents and young athletes because growth plates are still developing. It usually happens during sprinting, kicking, jumping, or sudden directional changes. The term is used in sports medicine, orthopedics, radiology, and physical therapy to describe a specific type of hip-and-pelvis injury.

PWB most commonly means **partial weight bearing** in orthopedic care. It describes a **temporary limit on how much body weight** you place through a leg. PWB is frequently used after **hip surgery, fractures, or soft-tissue repairs**. Clinicians use it as part of a **rehabilitation and healing plan** alongside physical therapy and assistive devices.

Partial weight bearing means putting only some of your body weight through an injured or healing leg when standing or walking. It is a temporary mobility restriction used to protect bones, joints, implants, and soft tissues while they recover. It is commonly prescribed after hip, pelvis, or lower-extremity surgery, and after certain fractures or overuse injuries. The exact amount allowed is defined by the treating clinician and may change over time.

Partial hip replacement is a surgery that replaces the “ball” of the hip joint while leaving the socket in place. Clinicians may also call it a *hemiarthroplasty* of the hip. It is most commonly used after certain hip fractures, especially femoral neck fractures. It can also be used in select non-fracture conditions when only the femoral head needs replacement.

PAO most commonly refers to **periacetabular osteotomy**. It is a **hip-preserving pelvic surgery** used to improve how the hip socket covers the femoral head. PAO is most often discussed in the context of **hip dysplasia** in adolescents and adults. Orthopedic hip specialists use PAO to **reorient the acetabulum (hip socket)** to better distribute joint forces.