Short-Term Results of the S-ROM-A Femoral Prosthesis

Kido, Kensuke; Fujioka, Mikihiro; Takahashi, Kenji; Ueshima, Keiichiro; Goto, Tsuyoshi; Kubo, Toshikazu

doi:10.1016/j.arth.2009.03.009

Cited by 28 publications

(7 citation statements)

References 28 publications

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“…Finally, in the present study, the JOA score at the final follow-up was relatively low (80 points) compared to previous reports [ 2 , 3 ]. The high rate of patients who had postosteotomy hip joint likely affected the functional results.…”

Section: Discussioncontrasting

confidence: 85%

“…They reported 0% aseptic loosening in 55 hips with anatomically difficult cases, of which 28 were severe DDH cases. Regarding the use of the S-ROM-A prosthesis, Kido et al [ 2 ] and Tamegai et al [ 3 ] reported that it was well-fitted for Asian DDH patients with short stature, a narrow canal, and severe proximal femoral deformity, showing favorable short- to midterm results. Zhao and Sun [ 4 ] reported good short-term results in elderly patients with poor bone quality containing Dorr type C using the S-ROM system.…”

Section: Discussionmentioning

confidence: 99%

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Total Hip Arthroplasty Using the S-ROM-A Prosthesis for Anatomically Difficult Asian Patients

Hozumi

Kobayashi

Tsuru

et al. 2015

BioMed Research International

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Background. The S-ROM-A prosthesis has been designed for the Asian proximal femur with a small deformed shape and narrow canal. In this study, the clinical and radiological results using the S-ROM-A prosthesis for Japanese patients with severe deformity due to dysplasia and excessive posterior pelvic tilt were examined. Methods. 94 hips were followed up for a mean of 55 months, with a mean age at surgery of 61 years. The primary diagnoses were 94 coxarthritis cases, including 51 dysplasia and 37 primary OA, 1 avascular necrosis, 2 traumatic arthritis, and 3 Perthes disease. Thirty-one hips had been treated with osteotomy of the hip joints. Preoperative intramedullary canal shapes were stovepipe in 23 hips, normal in 51 hips, and champagne-flute in 5 hips. The maximum pelvic inclination angle was 56°. Results. The mean JOA score improved from 46 points preoperatively to 80 points at final follow-up. On radiological evaluation of the fixation of the implants according to the Engh classification, 92 (97%) hips were classified as “bone ingrown fixation.” Conclusion. In primary THA, using the S-ROM-A prosthesis for Asian patients with proximal femoral deformity, even after osteotomy and with posterior pelvic tilt, provided good short- to midterm results.

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Section: Discussioncontrasting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Total Hip Arthroplasty Using the S-ROM-A Prosthesis for Anatomically Difficult Asian Patients

Hozumi

Kobayashi

Tsuru

et al. 2015

BioMed Research International

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“…The patients in this study should comparable improvement in their hip scores compared to previous reports of patients who underwent complex, primary, cementless, total hip arthroplasty with conical prostheses as well as modular prostheses [1,2,6,8,11,15,19,27,28,30,31]. Despite predictable success with similar stems, it remains critically important to systematically report clinical and radiographic results whenever new technology is introduced.…”

Section: Discussionmentioning

confidence: 62%

“…The optimal stem design in these patients is unknown. A number of studies have reported that modular prostheses such as the S-ROM (DePuy, Inc) can help deal with these anatomical challenges [2,5,6,11,19,30]; however, a theoretical disadvantage includes the potential for metal corrosion with modularity [9,20]. The Wagner Cone stem can accommodate small or deformed femora because of its proximal conical, tapered design.…”

Section: Discussionmentioning

confidence: 99%

Can a Conical Implant Successfully Address Complex Anatomy in Primary THA? Radiographs and Hip Scores at Early Followup

Zhang

Goodman

Maloney

et al. 2016

Clinical Orthopaedics &Amp; Related Research

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Background Total hip arthroplasty (THA) in patients with small or abnormal proximal femoral anatomy is challenging as a result of complex anatomic deformities in the hip. It is unclear which stem is the most appropriate for these patients. One possible implant design that may help meet this need is the modified Wagner Cone prosthesis, whose design consists of monoblock cone with splines; however, to our knowledge, no clinical results have been published using this implant. Questions/purposes We evaluated the hip scores and radiographic results (including signs of osseointegration and subsidence) of complex primary THA using the modified Wagner Cone cementless femoral component in patients with small or abnormal proximal femoral anatomic proportions.

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“…Achieving optimal component placement with accurate preoperative surgical planning could benefit the long-term survivorship as well as a better range of motion and functional recovery. Of course, surgeons can adjust the stem anteversion during THA by using undersized stem during THA [22]. However, this is not only difficult in the proximal femur with narrow mediolateral dimension [14] or metaphyseal filling stems following proximal femoral geometry [16], but also not recommendable for optimal initial stem stability and longevity of the stem as well [23].…”

Section: Discussionmentioning

confidence: 99%

Effect of altered proximal femoral geometry on predicting femoral stem anteversion in patients with developmental dysplasia of the hip

et al. 2019

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BackgroundThe deformity of the proximal femur and acetabular in patients with developmental dysplasia of the hip (DDH) renders an intraoperative decision for ideal component placement challenging. We hypothesized that the altered morphology of calcar femorale (CF) in DDH patients changed the fixation mechanism of the cementless metaphyseal-filling stem and aimed to predict stem anteversion using proximal femoral anatomical parameters from preoperative CT.MethodsPreoperative and postoperative CT scans of 34 DDHs with a metaphyseal-filling stem in THA were retrospectively analyzed. Proximal femoral anatomical parameters, including the femoral anteversion (FA) and the CF angles at the low femoral neck (LFN) and the center of the lesser trochanter (CLT) levels (FA-LFN, FA-CLT, CF-LFN, and CF-CLT) were measured. The dysplastic hips were divided into the CF group (n = 21) and the non-CF group (n = 13) according to the presence of the CF-LFN. The association between the anatomical parameters and the postoperative stem anteversion was statistically analyzed, and the predicted stem anteversion was compared with postoperative stem anteversion.ResultsIn the CF group, the combination of the CF-LFN and FA-CLT exhibited a strong positive correlation (R = 0.870, p < 0.001) with the postoperative stem anteversion. In the non-CF group, only the FA-LFN had a strong positive correlation (R = 0.864, p < 0.001). Average prediction errors were 5.9° and 6.4° in the CF and non-CF groups.ConclusionsThe presence of CF-LFN is related to the press-fit mechanism of the metaphyseal-filling stem, and the preoperative measurements from CT images can be employed as a tool to predict postoperative stem anteversion in DDH patients.

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Short-Term Results of the S-ROM-A Femoral Prosthesis

Cited by 28 publications

References 28 publications

Total Hip Arthroplasty Using the S-ROM-A Prosthesis for Anatomically Difficult Asian Patients

Total Hip Arthroplasty Using the S-ROM-A Prosthesis for Anatomically Difficult Asian Patients

Can a Conical Implant Successfully Address Complex Anatomy in Primary THA? Radiographs and Hip Scores at Early Followup

Effect of altered proximal femoral geometry on predicting femoral stem anteversion in patients with developmental dysplasia of the hip

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