Acetabulum – Hip Socket: Anatomy and Conditions
The acetabulum is the cup-shaped socket of the pelvis that receives the head of the femur, forming the hip joint.
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The acetabulum is the cup-shaped socket of the pelvis that receives the head of the femur, forming the hip joint.
What Is the Acetabulum?
The acetabulum is the cup-shaped socket located in the pelvis that articulates with the rounded head of the femur (femoral head) to form the hip joint (articulatio coxae). The hip joint is one of the largest and most load-bearing joints in the human body, essential for upright posture and movement.
The acetabulum is formed by the fusion of three pelvic bones: the ilium, the ischium, and the pubis. In adults, these three bones are fully fused together to form the hip bone (os coxae).
Anatomy and Structure
The acetabulum is deepened and stabilized by a ring of fibrocartilage called the acetabular labrum. The joint surface is lined with hyaline cartilage, which reduces friction and absorbs mechanical stress during movement.
- Facies lunata (lunate surface): The horseshoe-shaped cartilaginous articular surface that directly contacts the femoral head.
- Fossa acetabuli: A central, non-articular depression within the socket that contains fatty tissue and blood vessels.
- Incisura acetabuli (acetabular notch): A notch at the inferior margin of the acetabulum, allowing passage of blood vessels and nerves into the joint.
Function
The acetabulum serves as the socket component of the ball-and-socket hip joint, enabling a wide range of movements including flexion, extension, abduction, adduction, and rotation. It transmits body weight from the trunk to the lower limbs and is critical for activities such as standing, walking, and running.
Clinical Relevance
Hip Dysplasia
Hip dysplasia occurs when the acetabulum is too shallow or improperly oriented, causing inadequate coverage of the femoral head. This leads to joint instability, accelerated cartilage wear, and pain. The condition is often congenital and is routinely screened for in newborns using ultrasound.
Acetabular Fracture
An acetabular fracture typically results from high-energy trauma such as motor vehicle accidents or falls from height. Depending on the location and severity of the fracture, surgical fixation may be required to restore the joint surface and prevent long-term cartilage damage and post-traumatic arthritis.
Femoroacetabular Impingement (FAI)
Femoroacetabular impingement (FAI) is a condition in which abnormal bony growths on the acetabulum or femoral head cause mechanical friction within the hip joint. This results in pain, restricted movement, and may contribute to the early development of hip osteoarthritis.
Hip Osteoarthritis (Coxarthrosis)
Hip osteoarthritis (coxarthrosis) involves progressive degeneration of the articular cartilage of the acetabulum and femoral head. In advanced cases, total hip replacement surgery (total hip arthroplasty) may be necessary, in which the acetabulum is replaced with an artificial cup component.
Diagnosis
Several diagnostic methods are used to assess the acetabulum:
- X-ray: The standard imaging method for evaluating fractures, dysplasia, and osteoarthritis.
- Computed Tomography (CT): Provides detailed visualization of bony structures, especially for complex fractures.
- Magnetic Resonance Imaging (MRI): Used to assess soft tissue structures such as the acetabular labrum and joint cartilage.
- Ultrasound: Primarily used in newborns for early detection of hip dysplasia.
References
- Moore K.L., Dalley A.F., Agur A.M.R. – Clinically Oriented Anatomy. 8th edition. Wolters Kluwer, Philadelphia, 2018.
- Buckwalter J.A., Saltzman C., Brown T. – The Impact of Osteoarthritis: Implications for Research. Clinical Orthopaedics and Related Research, 2004.
- World Health Organization (WHO) – Musculoskeletal conditions. Available at: https://www.who.int/news-room/fact-sheets/detail/musculoskeletal-conditions (accessed 2024).
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Related search terms: Acetabulum + Acetabular socket