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Dislocation of hip prostheses
1Department of Orthopaedics, Haugesund Hospital, Norway. birger.valen@get.mail.no
Insights
Hip replacement dislocation occurs in 3.4% of cases, with larger 32mm heads showing fewer dislocations. Some patients experienced multiple dislocations, highlighting the need for careful prosthesis selection and surgical technique.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Arthroplasty Research
Background:
- Literature reports a 2-3% dislocation rate for hip prostheses.
- Dislocation causes are multifactorial, involving patient, surgeon, prosthesis, and operative factors.
- This study aimed to determine dislocation frequency, causes, and treatment within a specific hospital department.
Purpose of the Study:
- To identify the incidence of hip prosthesis dislocation.
- To investigate the causes and treatment strategies for hip prosthesis dislocation.
- To analyze dislocation rates across different prosthesis types and head sizes.
Main Methods:
- Retrospective analysis of 2,236 total hip arthroplasties performed between 1987 and 2011.
- Data collected from hospital databases and patient records.
- Average follow-up period of 6.1 years.
Main Results:
- A total of 75 patients (3.4%) experienced prosthesis dislocation.
- No significant difference in dislocation frequency was observed among the four prosthesis types studied.
- Prostheses with a 32mm head diameter had a significantly lower dislocation rate (2.0%) compared to others (3.6%, p=0.03).
Conclusions:
- The overall dislocation rate of 3.4% aligns with existing literature.
- Larger diameter femoral heads (32mm) may reduce the risk of hip prosthesis dislocation.
- Approximately one-third of patients with dislocated prostheses experienced recurrent dislocations.
Background:
In the literature, the dislocation rate for hip prostheses is stated to be 2-3%. Dislocation may have several causes, such as aspects of the patient, the surgeon, the type of prosthesis or the operation. The objective of this study was to identify the frequency, causes and treatment of dislocation in our department.
Material And Methods:
The material encompasses all patients operated on with a hip prosthesis at the Department of Orthopaedics, Haugesund Hospital, from 1987 through 2011. Information has been collected retrospectively from databases and patient records after an average of 6.1 years.
Results:
During this period, altogether 2,236 patients underwent total hip arthroplasty. Of these, 548 received an ITH prosthesis with a large caput (32 or 28 mm in diameter), while 1,290 received a 22 mm Charnley prosthesis. Lubinus Spll was used in 299 and Landos Corail in 99 patients, all with a caput diameter of 28 mm. In 75 patients (3.4%) the prosthesis had become dislocated. There was no significant difference in dislocation frequency among the four types of prosthesis. Prostheses with a caput diameter of 32 mm were dislocated significantly less frequently than the others (2.0% and 3.6%, p = 0.03) INTERPRETATION: Overall, our results correspond to findings made by others. In this retrospective material, approximately one-third of the patients with dislocated hip prostheses experienced multiple dislocations.
