HOW CUP POSITION AFFECTS DISLOCATION RATE IN PROXIMAL FEMORAL REPLACEMENT ARTHROPLASTY
DOI:
https://doi.org/10.55519/JAMC-01-13937Keywords:
Proximal femoral replacement, cup version, cup inclination, hip arthroplastyAbstract
Abstract:
Purpose Revision as well as primary Arthroplasty with proximal femoral resection has increased a lot in recent time. The main concerning thing in PFRA is rate of dislocation in cases that is due to absent or weak abductor function, so cup position plays an important role in reducing dislocation rate in such cases.
Methods This prospective study was conducted at department of orthopedic, Ghurki trust and teaching hospital, Lahore on those patients that had proximal femoral resection arthroplasty either as primary surgery or revision surgery, the cup position was measured postoperatively on x-ray and patient was followed for 12 weeks for any dislocation.
Results Our study comprises of 42 patients with 71.4% were male and 28.6% were female. The mean inclination was 41.23°, ranging from 21° to 67°, and the mean ante version was 16.43°, ranging from 4° to 40°. The dislocation rate was 21.42% and the inclination in dislocated patients was 44.05±9.02 and ante version was 17.44±6.42.
Conclusions Our study concludes that proper cup version and inclination plays a major role in preventing dislocation even in the absence of abductors in proximal femoral resection arthroplasty.
Keywords Proximal femoral replacement, cup version, cup inclination, Hip arthroplasty
References
1. Park KS, Jin SY, Lim JH, Yoon TR. Long-term outcomes of cementless femoral stem revision with the Wagner cone prosthesis. J Orthop Surg Res 2021;16(1):375.
2. Kurtz S, Ong K, Lau E, Mowat F, Halpern M. Projections of primary and revision hip and knee arthroplasty in the United States from 2005 to 2030. J Bone Joint Surg Am 2007;89(4):780–5.
3. Malkani AL, Lewallen DG, Cabanela ME, Wallrichs SL. Femoral component revision using an uncemented, proximally coated, long-stem prosthesis. J Arthroplasty 1996;11(4):411–8.
4. Puchner SE, Funovics PT, Hipfl C, Dominkus M, Windhager R, Hofstaetter JG. Incidence and management of hip dislocation in tumour patients with a modular prosthesis of the proximal femur. Int Orthop 2014;38(8):1677–84.
5. Ali M, Sahito B, Rajput IM, Kumar D, Hussain N, Kumar S. The Wagner Modular (S2) Prosthesis for Proximal Femur Bone Loss; Prospective Study of 19 Cases. PJMHS 2021;15(10):351–3.
6. Hu X, Zheng N, Hsu WC, Zhang J, Li H, Chen Y, et al. Adverse effects of total hip arthroplasty on the hip abductor and adductor muscle lengths and moment arms during gait. J Orthop Surg Res 2020;15(1):315.
7. Liaw CK, Hou SM, Yang RS, Wu TY, Fuh CS. A new tool for measuring cup orientation in total hip arthroplasties from plain radiographs. Clin Orthop Related Res 2006;;451:134–9.
8. McLawhorn AS, Sculco PK, Weeks KD, Nam D, Mayman DJ. Targeting a New Safe Zone: A Step in the Development of Patient-Specific Component Positioning for Total Hip Arthroplasty. Am J Orthop (Belle Mead NJ) 2015;44(6):270–6.
9. Lubbeke A, Roussos C, Barea C, Kohnlein W, Hoffmeyer P. Revision total hip arthroplasty in patients 80 years or older. J Arthroplasty 2012;27(6):1041–6.
10. Dargel J, Oppermann J, Brüggemann GP, Eysel P. Dislocation following total hip replacement. Dtsch Arztebl Int 2014;111(51-52):884–90.
11. Iljazi A, Sørensen MS, Ladegaard TH, Overgaard S, Petersen MM. Dislocation rate after hip arthroplasty due to metastatic bone disease: a retrospective cohort study evaluating the postoperative dislocation risk across different articulating solutions. Acta Orthop 2023;94:107–14.
12. Gusho CA, Clayton B, Mehta N, Colman MW, Gitelis S, Blank AT. Survival and outcomes of modular endoprosthetic reconstruction of the proximal femur for primary and non-primary bone tumors: single institutional results. J Orthop 2021;25:145–50.
13. Manjunath KS, Soruban V, Gopalakrishna KG. Evaluation of radiological methods of assessing cup anteversion in total hip replacement. Eur J Orthop Surg Traumatol 2015;25(8):1285–92.
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