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Related Concept Videos

Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the neck...
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The thigh's motion is primarily governed by muscles originating in the pelvic girdle and inserted into the femur. One crucial muscle, the iliopsoas, is a combination of the psoas major and the iliacus muscles, sharing a common insertion point on the lesser trochanter of the femur.
Three other significant muscles are the gluteus maximus, gluteus medius, and gluteus minimus. The gluteus maximus originates from the posterior surface of the ilium, sacrum, and coccyx, and the thoracolumbar fascia...
Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

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Updated: May 29, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

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Published on: July 2, 2021

Femoroacetabular impingement.

Suzanne E Anderson1, Klaus Arno Siebenrock, Moritz Tannast

  • 1The University of Notre Dame Australia, School of Medicine Sydney, 160 Oxford Street, Darlinghurst 2010, NSW, Sydney, Australia. andersonsembach@yahoo.com.au

European Journal of Radiology
|September 20, 2011
PubMed
Summary
This summary is machine-generated.

Femoroacetabular impingement (FAI) is painful hip joint contact due to bone shape changes. This condition causes hip pain, limited motion, and potential joint damage, affecting young adults.

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Area of Science:

  • Orthopedics
  • Radiology
  • Sports Medicine

Background:

  • Femoroacetabular impingement (FAI) is a hip joint condition characterized by abnormal bone morphology.
  • It involves premature, painful contact between the femur and acetabulum, leading to symptoms like hip/groin pain and restricted movement.
  • FAI can result in labral tears, cartilage damage, and bony lesions within the hip joint.

Purpose of the Study:

  • To describe the pathomechanics and clinical presentation of Femoroacetabular Impingement (FAI).
  • To differentiate between pincer and cam impingement types based on morphological changes.
  • To review the characteristic imaging findings associated with FAI.

Main Methods:

  • Review of the pathomechanical concept of FAI.
  • Description of morphological changes on the acetabular (pincer) and femoral head (cam) sides.
  • Discussion of clinical symptoms and imaging features.

Main Results:

  • Pincer impingement involves excessive acetabular coverage, causing linear contact.
  • Cam impingement involves an aspherical femoral head jamming into the acetabulum, typically seen in young males.
  • Both types lead to hip and groin pain, limited range of motion, and potential intra-articular damage.

Conclusions:

  • FAI is caused by abnormal hip joint morphology leading to painful impingement.
  • Understanding the distinct features of pincer and cam impingement is crucial for diagnosis.
  • Imaging plays a key role in identifying FAI and guiding treatment strategies.