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Orthopedic Robot-Assisted Femoral Neck System in the Treatment of Femoral Neck Fracture
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Orthopedic Robot-Assisted Femoral Neck System in the Treatment of Femoral Neck Fracture

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Optimizing diagnosis and management of ONFH, FNSF, and SIF

Haley M Cox1, Oluwafemi O Gbayisomore2, Alejandro J Rivera-Vega3

  • 1Yale School of Medicine, New Haven, Connecticut, USA.

EFORT Open Reviews
|July 1, 2026
PubMed

Insights

Osteonecrosis of the femoral head (ONFH), femoral neck stress fracture (FNSF), and subchondral insufficiency fracture (SIF) cause hip pain and can lead to collapse. Early MRI diagnosis and classification are vital for joint preservation and avoiding surgery.

Area of Science:

  • Orthopedics
  • Radiology
  • Sports Medicine

Background:

  • Osteonecrosis of the femoral head (ONFH), femoral neck stress fracture (FNSF), and subchondral insufficiency fracture (SIF) are common causes of non-arthritic hip pain.
  • These conditions share overlapping clinical presentations, often with groin pain and normal early radiographs, complicating diagnosis.
  • All three conditions risk femoral head viability and can lead to displacement or collapse, potentially requiring hip arthroplasty.

Purpose of the Study:

  • To differentiate between ONFH, FNSF, and SIF based on clinical context and imaging findings.
  • To emphasize the importance of early and accurate diagnosis for appropriate management and joint preservation.
  • To review diagnostic distinctions and management strategies for these hip pathologies.

Main Methods:

  • Review of diagnostic criteria and imaging features for ONFH, FNSF, and SIF.
  • Integration of clinical presentation, patient history (age, activity, bone quality), and MRI findings.
  • Analysis of potential management pathways based on accurate classification.

Main Results:

  • Early stages of ONFH, FNSF, and SIF may show normal radiographs or bone marrow edema on MRI.
  • MRI is the most sensitive imaging modality for detecting these conditions.
  • Accurate diagnosis requires synthesizing imaging features with patient history, distinguishing between ONFH, FNSF, and SIF.

Conclusions:

  • Early identification of ONFH before collapse allows for joint-preserving procedures like core decompression.
  • FNSF necessitates prompt recognition and non-weight-bearing to prevent displacement and vascular injury.
  • SIF management involves conservative measures like protected weight-bearing, while accurate classification prevents femoral head collapse or neck displacement.

Keywords:
avascular necrosisfemoral neck stress fracturefemoral neck stress reactionfemurhiposteonecrosis of the femoral headsubchondral insufficiency fracture

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