Radiology of Acetabular Fractures
– See: Radiology of the Pelvis – Classification: – elemental frx patterns: – posterior wall – posterior column frx – transverse frx – anterior column frx – anterior wall frx – associated frx patterns: … Read more
Pelvic
Radiology of Burst Fractures
– Criteria for Instability: (see stable and unstable frx) – loss > 50% of vertebral body height; – angulation of thoracolumbar junction > 20 deg – neurologic injury – canal comprimise > 30 % – spinal segment … Read more
Radiology of Pelvic Fractures
– See: Radiology of the Acetabulum – Discussion: – instability = cephalic displacement of posterior sacroiliac complex of at least 5-15 mm on inlet and outlet views; – look for gap (rather than impaction) posteriorly, & frx of 5th lumbar transverse process or avulsion of sacrospinous ligament; – Pertinent Radiographs: – AP … Read more
Radiographic Templating of Femoral Neck Length:
– See: – Technique of Femoral Neck Resection – Femoral Component Offset – Discussion: – some pts have relative coxa vara and a very short distance between the lesser trochanter and the pelvis; – others have a relative coxa valga and a large distance between the lesser … Read more
Radiographic Findings of Intertrochanteric Frx
– See: – Classification – Singh index – Unstable Intertrochanteric Fractures – AP view (internal rotation); – allows determination of frx obliquity & bone quality; – if hip is in external rotation, greater troch rotates posteriorly & will overlie part of the fracture … Read more
Radiographic Findings in SCFE
– Early Stages: – widening of epiphyseal line (representing growth plate); – AP View: – normal hip shows epiphysis of femoral head projecting above & lateral to the superior border of the femoral neck; – affected hip shows widening and irregularity of growth plate; – height of … Read more
Radiographic Evaluation of Hip Dislocation
– See: Radiology of Hip – Pre Reduction Evaluation: – frx-dislocation usually confirmed by a single AP x-ray; – rule out: assoc acetabular, femoral head, or femoral neck frx; – these must be recognized prior to reduction; – femoral head: for assoc frx; … Read more
Radiographic Evaluation of Perthes’ Disease
– Discussion: – bone scan and MRI may help early involvement, but may not correlate with the extent of involvement; – bone scans are highly sensitive for Perthes disease; – Radiographic Findings: (Waldenstrom): – initial findings: – ossific nucleus fails to … Read more
Radiographic Evaluation of the Acetabular Cup
– see postoperative radiographic evaluation of total hip replacement – Discussion: – acetabular component loosening: – osteolysis / polyethylene wear: – Component Position: – acetabular component flexion: – to measure postoperative cup position, a standing true lateral view of the operated hip allowed direct measurement of … Read more
Radiographic Features: DDH
– See: DDH – Indications for Radiographs: – for confirming position of hips getting treatment; – for confirming a suspected teratologic dislocation; – Patient age: – x-rays may not reveal a dislocation until infant is > 6 wks since so much of the pelvis is cartilaginous; … Read more