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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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Hip Microinstability: New Concepts and Comprehensive Imaging Evaluation.

Júlio B Guimarães1, Pedro H C Arruda1, Luis Cerezal1

  • 1From the Department of Musculoskeletal Radiology, Fleury Medicina e Saúde, Rua Mato Grosso, 306, Higienópolis, São Paulo, Brazil (J.B.G., P.H.C.A., M.A.S.R., I.A.N.C., L.R.M., M.A.C.N., A.G.O.F.); Department of Radiology, Diagnóstico Médico Cantabria (DMC), Santander, Cantabria, Spain (L.C.); Department of Orthopedics, Instituto Vita, São Paulo, Brazil (H.A.B.A.C.); and Department of Radiology and Orthopedic Surgery, University of Texas Southwestern Medical Center, Dallas, Tex (A.C.).

Radiographics : a Review Publication of the Radiological Society of North America, Inc
|June 5, 2025
PubMed
Summary
This summary is machine-generated.

Hip microinstability, subtle femoroacetabular motion, causes hip pain. Advanced imaging like MRI and dynamic ultrasound are crucial for diagnosing this condition, especially when standard X-rays are inconclusive.

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Area of Science:

  • Orthopedic imaging
  • Radiology
  • Hip biomechanics

Background:

  • Hip instability encompasses abnormal femoroacetabular motion, often resulting from trauma, surgery, or hip dysplasia.
  • Subtle hip instability, termed microinstability, is increasingly recognized, presenting with symptoms like apprehension and hip or groin pain.

Purpose of the Study:

  • To provide a comprehensive overview of hip instability, focusing on the concept of microinstability.
  • To discuss the role of various imaging modalities in the diagnosis of hip microinstability.

Main Methods:

  • Review of current literature on hip instability and microinstability.
  • Discussion of diagnostic capabilities of standard radiography, advanced MRI, MR arthrography, leg traction MRI, and dynamic ultrasound.

Main Results:

  • Standard radiographs may not detect subtle findings of hip microinstability.
  • Advanced imaging techniques like MRI and dynamic ultrasound are essential for detailed assessment of chondrolabral injuries, capsular lesions, and dynamic instability.
  • Dynamic imaging can reveal increased femoral head translation in cases of capsular laxity associated with conditions like Ehlers-Danlos syndrome.

Conclusions:

  • Accurate diagnosis of hip microinstability requires a combination of clinical evaluation and advanced imaging.
  • Radiologists play a key role in multidisciplinary hip practices for timely diagnosis and management.
  • Understanding evolving concepts of hip instability, particularly microinstability, is crucial for effective patient care.