June 20, 2024

Femoroacetabular impingement is the abnormal contact between the proximal femur and the acetabulum during terminal motion

It leads to damage to the acetabular labrum and articular cartilage due to injury

Classification of Femoroacetabular impingement

CAM-type Femoroacetabular impingement

Pincer-type Femoroacetabular impingement

Classification and differences are illustrated below:

Types of Femoroacetabular impingement
Classification and differences

Clinical Features of Femoroacetabular impingement

Femoroacetabular impingement symptoms are given below:

Pain in the groin region with an insidious onset

Exacerbated by exercises and may be positional

Tenderness on hip palpation

Asymmetrical range of motion

Impingement test (+)


Cross over sign

Crossover sign of femoroacetabular impingement
Crossover sign

Appearances of the anterior acetabular wall lying anterior to posterior acetabular wall in the superior portion of joint

Alpha angle

Alpha angle
Alpha angle

Angle is formed by two lines :

  1. The line through the centers of the femoral head and neck
  2. Line through center of femoral head to the point of no specificity of the femoral head

Treatment of Femoroacetabular impingement

Initial treatment always begins with nonoperative measures:


Activities modification

Femoroacetabular impingement exercises


Physical therapy

No response to conservative treatment: Arthroscopic management

The aim of Surgical treatment is

  1. Treat labral pathology and chondral damage
  2. Remove sites of bony impingement
  3. The reestablished femoral head and neck offset

This impingement is common in pregnancy and following Total hip replacement if not fixed properly.

See also: Hip Examination

See also: Slipped Capital Femoral Epiphysis

See also: Tuberculosis of the Hip Joint

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