Early Clinical and Radiographic Outcomes of Total Hip Arthroplasty with DELTA ST-C Cup and MINIMA S Stem

Abstract

Background and Objectives: The uncemented threaded DELTA ST-C cup was introduced in last few years. It has a hemispheric shell, consisting of Ti6Al4V titanium alloy. The MINIMA S stem was developed according to the principles of proximal-loading and extended metaphyseal geometry applied to a short stem. The purpose of the study was to assess the clinical and radiographic outcomes and the short- and mid-term survivorship of the DELTA ST-C cup and MINIMA S stem in patients undergoing total hip arthroplasty (THA). The present is the first study to report outcomes and implant survivorship of the DELTA ST-C cup coupled with the MINIMA S femoral stem. Materials and Methods: The present study is a retrospective observational cohort study of a prospectively maintained database, evaluating clinical outcomes and implant survivorship in 95 patients undergoing THA with the MINIMA stem coupled with the DELTA ST-C cup with at least a 3-year follow-up. The clinical evaluation was assessed with a change in the Harris hip score (HHS), while the radiographic evaluation included anteroposterior views of the pelvis and lateral views of the affected hip. Results: The enrolled population’s mean age was 69.3 years and most patients were female (64%). The MINIMA S standard stem was implanted in 68 patients (72%), the lateralized stem was implanted in 27 (28%), and the mean acetabular inclination was 48.2°. The HHS improved significantly from the preoperative value (median 46, IQR: 38–55), already at 1 month after surgery (median 76, IQR: 66–77), reaching excellent results at 1 year and 3 years postoperatively (median 96, IQR: 91–100). X-rays demonstrated good implant stability and biomechanics parameter restorations revealed no sign of subsidence, and the presence of radiolucent lines greater than 2 mm in the short stem area in five cases and in the acetabulum in one were not clinically significant. No revisions have been performed so far. Conclusions: The MINIMA S stem coupled with the DELTA ST-C cup demonstrated very good clinical and radiological results with a significant increase of the Harris hip score at short- and mid-term follow-up. This is the first study evaluating the DELTA ST-C cup, showing promising outcomes during the study’s follow-up. The MINIMA S stem has been evaluated in a very few studies. However, the combination with this particular cup had not yet been studied. The design of the stem and the cup ensures primary stability and excellent early term outcomes, moreover the study demonstrates extraordinary implant survivorship, equal to 100%.

Modified Anterolateral Minimally Invasive Surgery (ALMIS) for Total Hip Replacement: Anatomical Considerations, Range of Motion and Clinical Outcomes

“…The mean HHS of this cohort had already improved significantly at the 1-month follow-up, exhibiting quick improvement that could be attributed to the MIS, while the mean score was in the excellent outcomes group. Similar results have been reported from other smaller cohorts regarding the ALMIS technique, as well as other minimally invasive approaches for THA [ 21 , 22 , 23 ].…”

“…In this study, threaded cups were used. The 3rd generation threaded cups have revealed high primary stability, achieved with helicoids, representing an essential factor for good subsequent osteointegration and, hence, also for long-term secondary stability [ 21 , 26 , 27 , 28 , 29 ]. Although threaded cups have revealed biomechanical advantages when compared to press-fit cups, they are not frequently used [ 26 , 29 ].…”

“…Although threaded cups have revealed biomechanical advantages when compared to press-fit cups, they are not frequently used [ 26 , 29 ]. This could be attributed to the failure of the 1st generation implants, which by having a smooth surface led to high rates of implant breakage and loosening [ 21 ]. These problems no longer exist with the 3rd generation implants that have a porous-coated surface [ 28 , 29 ].…”

Study of Early Clinical and Radiological Outcomes of Cementless Total Hip Arthroplasty in Young Adults

“…For people with a wide variety of severe hip joint issues, total hip arthroplasty (THA) is a very effective and commonly utilized operation. Today, patients have higher expectations for their recovery after THA, taking into consideration quality of life difficulties and recreational choices (9) . As implant technology has advanced, the median age of patients undergoing total hip replacement (THR) has declined.…”