AVN femoral head refers to avascular necrosis (AVN) affecting the ball of the hip joint (the femoral head). It describes bone tissue damage that can happen when blood supply to the femoral head is reduced. The term is commonly used in orthopedics, sports medicine, and radiology when evaluating hip pain and hip joint damage. It helps clinicians describe a specific cause of hip arthritis-like symptoms and guide next-step testing and management.

Atypical femur fracture is a specific pattern of break in the thigh bone (femur). It typically occurs in the upper or middle shaft area rather than at the hip joint. It is often discussed in osteoporosis care and orthopedic fracture management. Clinicians use the term to separate this pattern from more common “typical” femur fractures.

Athletic pubalgia is a cause of persistent groin pain related to injury of the lower abdominal and groin soft tissues. It is commonly discussed in sports medicine when athletes have pain near the pubic bone without a clear “true” hernia. It is sometimes referred to as a sports hernia or core muscle injury, though terms vary. It is most often considered in running, cutting, and kicking sports.

Assistive device training is structured instruction on how to safely use mobility aids such as canes, crutches, walkers, or wheelchairs. It focuses on walking technique (gait), transfers (like sit-to-stand), and navigating real-world environments. It is commonly used in orthopedic and sports medicine care, physical therapy, occupational therapy, and after surgery or injury. The goal is safer movement while protecting painful or healing joints, including the hip.

An Assistive device is a tool that helps a person move, transfer, or perform daily tasks more safely and efficiently. It is commonly used when pain, weakness, or balance problems limit normal walking or self-care. In hip and orthopedic care, it often reduces stress on an injured or arthritic joint. It may be recommended in clinics, hospitals, rehabilitation settings, and at home.

An ASIS avulsion fracture is an injury where a small piece of bone is pulled off the pelvis at the anterior superior iliac spine (ASIS). It usually happens when a strong muscle contraction suddenly tugs on its tendon attachment. It is most often discussed in sports medicine and adolescent hip injuries. Clinicians use the term to describe a specific, recognizable cause of acute front-of-hip pain.

ASIS apophysitis is an overuse-related irritation at a growth area on the front of the pelvis. It affects the apophysis (a growth plate–like attachment site) at the anterior superior iliac spine (ASIS). It is most often discussed in adolescent athletes with hip or groin-region pain. Clinicians use the term to describe a specific pattern of traction-related pain at a tendon attachment during growth.

ASIS stands for the **anterior superior iliac spine**. It is a **bony point on the front of the pelvis** that you can often feel under the skin. Clinicians use ASIS as a **reliable anatomical landmark** during exams, imaging, and some procedures. It is commonly referenced in orthopedics, sports medicine, physical therapy, and hip care.

Aseptic loosening femoral stem is a type of hip replacement failure that happens without infection. It means the femoral stem (the thighbone component of a hip implant) is no longer firmly fixed to bone. It is most often discussed after total hip arthroplasty (total hip replacement) or revision hip surgery. It can cause pain, decreased function, and sometimes implant instability over time.

Aseptic loosening acetabular component is a common long-term failure mode of total hip replacement. It means the hip socket implant (the acetabular component, or “cup”) becomes loose without an infection. It is most often discussed when a person has new or worsening hip pain years after hip arthroplasty. Clinicians use the term during evaluation, imaging review, and planning for possible revision surgery.