The femur is the longest, strongest, and heaviest bone in the human body, constituting the single bone in the thigh that connects the hip joint to the knee joint. It is crucial for locomotion and weight-bearing, consisting of a proximal head/neck, a cylindrical shaft, and a distal condylar end. It serves as a major insertion point for over 20 muscles and ligaments.
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Proximal Femur (Hip Joint)
:
A rounded, medial-facing projection that articulates with the acetabulum of the pelvis
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Femoral Shaft
- Structure: Long and cylindrical, with a slight anterior bow to absorb stress.
- Linea Aspera: A prominent, rough ridge running down the posterior aspect, providing attachment for adductor muscles.
Gluteal Tuberosity: Site on the upper shaft for gluteus maximus attachment.
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Distal Femur (Knee Joint)
- Medial & Lateral Condyles: Large, rounded articular surfaces that connect to the tibia.
- Epicondyles: Projections on the sides of the condyles for ligament attachment.
- Patellar Surface: Anterior groove where the patella (kneecap) glides.
Intercondylar Fossa: A deep depression between the condyles on the posterior side.
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Key Clinical and Anatomical Facts
- Orientation: The head is superior and medial; the linea aspera is posterior.
- Blood Supply: The femoral head receives blood from the circumflex arteries and the artery of the ligamentum teres.
- Structure: Primarily composed of dense cortical bone.