Do Plain Radiographs Correlate With CT for Imaging of Cam-type Femoroacetabular Impingement?

Diagnosing Femoroacetabular Impingement From Plain Radiographs

Methods: Six physicians (3 orthopaedic surgeons, 3 musculoskeletal radiologists) independently evaluated a broad spectrum of FAI pathologies across 51 hip radiographs on 2 occasions separated by at least 4 weeks. Reviewers used 8 common criteria to diagnose FAI, including (1) pistol-grip deformity, (2) size of alpha angle, (3) femoral head-neck offset, (4) posterior wall sign abnormality, (5) i...

Osseous impingement occurs early in flexion in cam-type femoroacetabular impingement: a 4D CT model.

AIMS The aim of this study was to examine the real time in vivo kinematics of the hip in patients with cam-type femoroacetabular impingement (FAI). PATIENTS AND METHODS A total of 50 patients (83 hips) underwent 4D dynamic CT scanning of the hip, producing real time osseous models of the pelvis and femur being moved through flexion, adduction, and internal rotation. The location and size of t...

Subchondral Bone Properties Of Cam-type Femoroacetabular Impingement Deformities

Statistical Shape Modeling of Cam-type Femoroacetabular Impingement

Cam femoroacetabular impingement (FAI) is characterized by a malformed femoral head that may cause shearing between the femur and acetabulum, leading to intraarticular damage and early hip osteoarthritis. Radiographic measurements are used to diagnose cam FAI, but provide only a planar view of the femoral head and often assume the ideal femur shape to be spherical. Statistical shape modeling (S...

The Etiology of Cam-type Femoroacetabular Impingement: A Cadaveric Study.

BACKGROUND There is a dearth of literature examining the causes of cam-type femoroacetabular impingement (FAI) and when such morphology appears. The purpose of the current study was to analyze how the ossific portion of the proximal femur develops over time with respect to standard cam-type FAI parameters. METHODS A collection of 193 femurs from cadavers aged 4 to 21 years were evaluated. The...