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Position, orientation and component interaction in dislocation of the total hip prosthesis
K Herrlin1, G Selvik, H Pettersson
1Department of Diagnostic Radiology, University Hospital, Lund, Sweden.
Acta Radiologica (Stockholm, Sweden : 1987)
|July 1, 1988
Summary
Dislocation after total hip replacement is linked to reduced femoral anteversion and limited prosthetic component flexion. This restricted range of motion may cause impingement and leverage, leading to prosthetic dislocation.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Biomechanics
Background:
- Total hip replacement (THR) is a common procedure to alleviate hip pain and improve function.
- Prosthetic component positioning and interaction are critical for successful THR outcomes.
- Dislocation remains a significant complication following THR, necessitating further investigation into its causes.
Purpose of the Study:
- To investigate the positional and orientational differences of prosthetic components in patients experiencing dislocation after THR.
- To identify biomechanical factors contributing to prosthetic dislocation in total hip replacement.
Main Methods:
- Comparative analysis of prosthetic component position, orientation, and spatial interaction.
- Utilized 3D analysis in 15 patients with THR dislocations and 44 control patients without dislocations.
Main Results:
- Patients with THR dislocations exhibited significantly decreased femoral anteversion.
- A significantly reduced range of femoral flexion was observed in the dislocation group.
- No other clinically relevant differences in component positioning or interaction were found between groups.
Conclusions:
- Decreased femoral anteversion and limited prosthetic component flexion are associated with THR dislocations.
- Impingement of prosthetic components, leading to a leverage effect, is a likely cause of dislocation in some THR cases.