Original ArticleLong-term Results of the Cementless ALLOCLASSIC Hip Arthroplasty System Using a 28-mm Ceramic Head: With a Retrospective Comparison to a 32-mm Head
Section snippets
Material and Methods
The ALLOCLASSIC CSF cup is manufactured of pure titanium. Its shape is conical. On the outer surface, self-cutting lamella threads are responsible for the primary stability of the shell during implantation. Polyethylene inlays are inserted into the cup and are fixed by a self-locking mechanism.
The ALLOCLASSIC SL stem has a rectangular cross-section, which provides a high rotational stability. Furthermore, it makes an extended removal of the endostium of the femur during implantation
Clinical Results
Before surgery, the HHS was on average 36.4 points (median, 36 points; minimum, 21; maximum, 46). At time of follow-up, the HHS was on average 89.7 points (median, 94 points; minimum, 54; maximum, 100). Thus, the HHS was increased on average by 53.3 points.
Before operation, 78 hips (100.0%) had severe pain. At time of follow-up, 61 hips (78.2%) were pain-free, 12 hips (15.4%) showed minimal pain, and 5 (6.4%) showed slight pain.
Radiologic Results
Ectopic ossification was found in 32 (41.0%) hips. Ossification
Discussion
One of the most important parameters in THA is the survival rate. Because the different frequently used implants nowadays provide already very good results, long-term follow-ups are necessary to rate the reliability of the prosthesis. In this series, we analyzed 78 hips clinically and radiologically after an average of 150.6 months. With a survival rate of 100% for the ALLOCLASSIC SL stem and 98.4% for the CSF cup after 157 months (end point aseptic loosening), results using this system are
Conclusion
The survival rate as well as the clinical and radiologic outcome of the ALLOCLASSIC SL stem and CSF cup in conjunction with a 28-mm ceramic ball head after 157 months is very good (Fig. 6). Keeping the restriction of a retrospective analysis in mind, the comparison to the 32-mm head shows a smaller number of radiolucent lines and osteolyses. However, the survival rate of the CSF cup was not improved. Longer follow-up studies for both the 32- and the 28-mm ceramic head might indicate whether the
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Cited by (36)
Thirty-Year Minimum Follow-Up Outcome of a Straight Cementless Rectangular Stem
2024, Journal of ArthroplastyProspective randomized study using EBRA-FCA to compare bone fixation between cementless SL-PLUS Zweymüller versus SL-PLUS MIA femoral implants in primary total hip arthroplasty with clinical assessment at a minimum 5 years’ follow-up
2020, Orthopaedics and Traumatology: Surgery and ResearchCitation Excerpt :At 2 years’ follow-up, there were significant differences in onset of radiolucency, but only on lateral views: SL-PLUS™ showed more periprosthetic radiolucent lines in Gruen zones 8, 9 and 14. In the literature, periprosthetic radiolucency and osteolysis predominate in zones 1, 7, 8 and 14 [2–6,8,23,29–31]. This was partly seen in the present study, with osteolysis in zones 1, 7 and 8 at 2 years with SL-PLUS™ stems.
Long-Term Results of Third-Generation Ceramic-on-Ceramic Bearing Cementless Total Hip Arthroplasty in Young Patients
2016, Journal of ArthroplastyCitation Excerpt :New alternative bearings, such as ceramic-on-ceramic bearings, with greater resistance have been developed with the promise to reduce wear debris and extend implant longevity [5-8,11,22]. Although several studies reported the incidence of osteolysis after ceramic-on-ceramic THAs in small number of patient cohorts [5-8,11,22], there are no published report to our knowledge, on the prevalence of osteolysis after ceramic-on-ceramic THAs in the large number of patient cohorts longer than 15-year follow-up. In the present study, we determined the clinical and radiologic outcome; how many lesions of osteolysis could be detected with radiographs and CT scans; and survivorship of a cementless THA using a alumina-on-alumina ceramic bearing in 871 active patients aged younger than 65 years.
Fixation of non-cemented total hip arthroplasty femoral components in a simulated proximal bone defect model
2013, Journal of ArthroplastyCitation Excerpt :On the other hand, several studies suggest that stems with sharp edges can increase stresses in the femoral canal [4,58,59] and can lead to thigh pain, increased femoral cortex thickening, increased centrally located focal osteolysis, and increased incidence of distal migration [4,59]. Furthermore, several clinical follow-up studies have reported occurrences of intraoperative femoral fractures while implanting the Zweymuller stem [3–5]. Therefore, in order to avoid fracture upon implantation, we suggest measuring the bone mineral density of the femur before selecting the femoral stem.
No benefits or funds were received in support of the study.