Abstract :
Introduction: Total hip arthroplasty (THA) is considered one of the most successful surgical procedure in
Orthopaedics. The dual articulation cup was developed by Professor Gilles Bousquet and André Rambert
in 1974 and combined the “low friction” principle of THA popularised by Charnley with the McKee-Farrar
concept of using alarger diameter femoral head to enhance implant stability.
Multiple studies have shown decreased instability and lower dislocation rates in primary hip arthroplasty
with dual mobility implants, resulting in the use of dual mobility implants for primary THA in younger,
lower-risk patients or as treatment method for recurrent instability, studies report dislocation rates of dualmobility
implants ranging from 0% to 3.6% in THA.
The purpose of this study is to demonstrate the performance and reliability of “DUAL MOBILITY CUP”
used during Total hip arthroplasty.
Materials and Methods: It is a hospital based prospective study of 20 patients diagnosed clinically and
radiologically with conditions require THR between Nov 2017 – Jan 2020. All the patient who received
a dual mobility cup between Oct 2017 and Oct 2019 in hospitals attached to Bangalore Medical College
& Research Institute, Bangalore were studied for a duration of 12 months. The functional outcome was
assessed with HARRIS HIP SCORE and PMA SCORE. The data was analysed using descriptive statistics.
Results: In our study the HHS improved from mean value of 63.89 in first month to mean value 90.3 as in
12 months and 11 patients shows excellent outcome at the 12th month follow up with p value < 0>
the PME score improved from mean 12.26 in first month to mean value of 15.72 as excellent in month, 18
patients shows excellent outcome at final follow up.
Out of the 20 patient one sustained peri prosthetic fracture (5%) (Vancouver AL), One patient developed
SSI(5%), One patient died postoperatively due to medical issues (5%) (Acute renal failure), all other
patients had no complications related to total hip arthroplasty with implant survivorship of 94% at the
end of 1 year.
Conclusion: Dual mobility cup total hip replacement is an acceptable method for patients who are planned
for Total Hip Arthroplasty as it provides pain relief and good function without compromising the stability.
Use of dual mobility cup in total hip arthroplasty is shown good results in the short term follow up (Good
to Excellent) compared to conventional total hip replacement.
High-quality, prospective, comparative studies are needed to evaluate further the use of dual mobility
components in THA.
Keyword :
Dual mobility cup, Total hip arthroplasty, Tripolar implants, Hip prosthesis, Dislocation, PMA (Postel Merly d’aubin score).