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Hounsfield unit values are useful for predicting early outcomes after acetabular fractures: a retrospective study
Taku Ukai1, Miyu Tamaki1, Masato Sato1
1Department of Orthopaedic Surgery, Surgical Science, Tokai University School of Medicine, Kanagawa, Japan.
Insights
Hounsfield units (HU) measured by CT scans can predict early outcomes for acetabular fractures. Lower HU values indicate a higher risk of osteoarthritis and poorer prognosis after fracture fixation.
Area of Science:
- Orthopaedic Surgery
- Radiology
- Biomedical Engineering
Background:
- Acetabular fractures are complex orthopaedic injuries with a high rate of conversion to total hip arthroplasty (THA) in older patients.
- Bone quality is a critical prognostic factor, often assessed using computed tomography (CT) Hounsfield units (HU).
- The direct impact of CT-measured HU values on early acetabular fracture outcomes remains understudied.
Purpose of the Study:
- To investigate the correlation between Hounsfield unit (HU) values and early outcomes following acetabular fracture fixation.
- To determine if HU values can serve as a prognostic indicator for complications such as osteoarthritis and the need for THA.
Main Methods:
- A cohort of 50 patients undergoing open reduction and internal fixation for acetabular fractures was analyzed.
- Hounsfield unit (HU) values were measured from the fifth vertebral body and the unaffected femoral head.
- Outcomes including fracture type, reduction quality, secondary hip osteoarthritis, THA conversion, and postoperative displacement were recorded over a mean 24-month follow-up.
Main Results:
- A significant difference in unaffected femoral head HU values was observed between elementary (250.5 ± 50.5) and associated (221.5 ± 48) acetabular fractures (p < 0.047).
- HU values of the vertebral body and unaffected femoral head correlated with the postoperative displacement gap and were lower in patients who developed secondary osteoarthritis.
- A HU cut-off value of approximately 180 was identified for predicting early osteoarthritic changes.
Conclusions:
- Hounsfield unit values are significantly correlated with acetabular fracture type, postoperative displacement, and the development of early osteoarthritis.
- CT-derived HU measurements are clinically valuable prognostic factors for predicting early outcomes in acetabular fracture patients.
Background:
Acetabular fractures are among the most challenging orthopaedic fractures, and a high total hip arthroplasty (THA) conversion rate has been reported in older patients with acetabular fractures. Bone quality is a poor prognostic factor after acetabular fracture fixation and has been assessed using computed tomography (CT). However, the relationship between Hounsfield unit (HU) values measured using CT and early acetabular fracture outcomes remains unknown. This study aimed to elucidate the effect of HUs on early acetabular fracture outcomes.
Methods:
50 consecutive patients who underwent open reduction and internal fixation for acetabular fractures were included. The mean follow-up duration was 24 months. 27 hips had elementary fractures and 23 had associated fractures. The reduction quality assessed using CT was as follows: anatomical, 13 hips; imperfect, 10 hips; and poor, 27 hips. Secondary hip osteoarthritis was observed in 5 patients (10%), and the surgery was converted to THA in 1 patient (2%). The HU values of the fifth vertebral body and the unaffected side of the femoral head were measured. The fracture type, radiological secondary hip osteoarthritis, conversion to THA, and postoperative displacement gap were recorded.
Results:
The unaffected femoral head HU values in elementary fractures (250.5 ± 50.5) were significantly higher than those in associated fractures (221.5 ± 48) (p < 0.047). The HU values of the fifth vertebral body and the unaffected femoral head were significantly correlated with the postoperative residual displacement gap and were significantly lower in those with secondary osteoarthritis than in those without it. The cut-off value for predicting early osteoarthritic change after an acetabular fracture was approximately 180.
Conclusions:
The HU values were correlated with the fracture type, postoperative displacement gap, and early osteoarthritic change after acetabular fractures and are clinically useful prognostic factors for early acetabular fracture outcomes.
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