Acetabular protrusion following endoprosthetic hip surgery: a multifactorial study

Area of Science:

• Orthopedic surgery
• Radiology
• Biomedical engineering

Background:

• Acetabular protrusion is a known complication following hip arthroplasty.
• Hemiprosthesis is often used for acute femoral neck fractures or failed internal fixation.
• Understanding risk factors for acetabular protrusion is crucial for patient outcomes.

Purpose of the Study:

• To investigate the association of radiological variables with acetabular protrusion after hip hemiprosthesis.
• To identify preoperative, operative, and follow-up factors related to acetabular protrusion development.
• To explore the relationship between acetabular protrusion and clinical outcomes like pain.

Main Methods:

• Analysis of radiological variables in 211 patients with hip hemiprosthesis.
• Log-linear models were fitted to assess associations between variables.
• Evaluation of preoperative, operative, and follow-up data.

Main Results:

• Acetabular protrusion was identified in 56 out of 211 patients.
• Follow-up time and previous hip surgery were significantly associated with protrusion development.
• Acetabular protrusion showed a significant association with postoperative pain, often being the primary cause.

Conclusions:

• Longer follow-up and prior hip surgery are risk factors for acetabular protrusion.
• Acetabular protrusion is a significant source of postoperative pain.
• Consideration for total hip replacement may be warranted in select patients with prior hip surgery receiving hemiprosthesis.