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Facies Lunata Acetabuli – Hip Socket Articular Surface

The facies lunata acetabuli is the crescent-shaped, cartilage-covered articular surface of the hip socket that articulates with the femoral head, enabling smooth and low-friction movement.

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Things worth knowing about "Facies lunata acetabuli"

The facies lunata acetabuli is the crescent-shaped, cartilage-covered articular surface of the hip socket that articulates with the femoral head, enabling smooth and low-friction movement.

Definition

The facies lunata acetabuli (Latin: lunata = moon-shaped) is the crescent-shaped articular surface located within the acetabulum (hip socket). It is covered by hyaline cartilage and forms the primary contact zone between the hip socket and the femoral head. Together, these structures form the hip joint (articulatio coxae), one of the most important weight-bearing joints in the human body.

Anatomy and Location

The acetabulum is a cup-shaped cavity on the os coxae (hip bone), formed by the fusion of three bones: the ilium, the ischium, and the pubis. The facies lunata borders the central non-articular depression known as the fossa acetabuli and is interrupted inferiorly by the acetabular notch (incisura acetabuli).

Shape: Crescent-shaped (lunate), open inferiorly at the acetabular notch
Surface: Covered by hyaline articular cartilage (approximately 2–4 mm thick)
Function: Direct articular contact surface with the femoral head during movement and weight-bearing
Border: Supplemented peripherally by the acetabular labrum (fibrocartilaginous rim)

Function

The facies lunata acetabuli serves several important biomechanical roles within the hip joint:

Load transmission: It distributes compressive forces generated during walking, standing, and running evenly across the pelvic bones.
Friction reduction: The hyaline cartilage, combined with synovial fluid, allows nearly frictionless movement of the femoral head within the socket.
Shock absorption: The cartilage layer absorbs impact forces and protects the underlying bone from damage.

Clinical Relevance

Damage to or disease affecting the facies lunata acetabuli can lead to significant impairment of hip joint function. The most clinically relevant conditions include:

Hip Osteoarthritis (Coxarthrosis)

Coxarthrosis involves the progressive degradation of the hyaline cartilage on the facies lunata and the femoral head. This results in pain, stiffness, and reduced range of motion. In advanced stages, total hip replacement (THR) may be required.

Femoroacetabular Impingement (FAI)

Femoroacetabular impingement occurs when abnormal bony morphology causes mechanical conflict between the femoral head and the acetabulum during movement. Repeated microtrauma to the facies lunata can lead to cartilage damage and, over time, to osteoarthritis.

Hip Dysplasia

In hip dysplasia, the acetabulum is underdeveloped or maloriented, meaning the facies lunata does not adequately cover the femoral head. This increases focal pressure on the articular surface and predisposes the patient to early-onset cartilage degeneration.

Acetabular Fracture

High-energy trauma (e.g., motor vehicle accidents) can fracture the acetabulum. When the fracture involves the facies lunata, precise anatomical restoration of the articular surface is essential to prevent post-traumatic arthritis.

Diagnosis

Several imaging modalities are used to assess the facies lunata acetabuli:

X-ray: Initial assessment for arthritis, dysplasia, or fracture
Magnetic Resonance Imaging (MRI): Detailed evaluation of cartilage, labrum, and soft tissues; considered the gold standard for cartilage assessment
Computed Tomography (CT): Precise evaluation of bony structures, particularly in the case of fractures
Arthroscopy: Direct visual inspection of the articular surface during a minimally invasive procedure

References

Schünke M, Schulte E, Schumacher U. Prometheus – Atlas of Anatomy: General Anatomy and Musculoskeletal System. 5th ed. Stuttgart: Thieme; 2018.
Standring S (ed.). Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed. Edinburgh: Elsevier; 2021.
Ganz R, Parvizi J, Beck M, Leunig M, Nötzli H, Siebenrock KA. Femoroacetabular impingement: a cause for osteoarthritis of the hip. Clinical Orthopaedics and Related Research. 2003;417:112–120.

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