Outcomes of Ceramic Composite in Total Hip Replacement Bearings: A Single-Center Series

Despite the fact that total hip replacement is one of the most successful surgical procedures for treatment of a variety of end-stage hip diseases, the process of osteolysis and implant loosening remains a significant problem, especially in young and high-demand patients. More than 40 years ago, ceramic bearings were introduced due to their mechanical advantage in order to obtain a reduction in wear debris, and due to the conviction that it was possible to minimize friction and wear owing to their mechanical hardness, high chemical stability, surface lubrication by fluids and low friction coefficient. Together with excellent mechanical properties, ceramics have a biological inertness: eventual ceramic debris will lead to a reactive response with a high predominance of fibrocystic cells, rather than macrophagic cells, and absence of giant cells, which is ideal from a biological perspective. As a consequence, they will not trigger the granulomatous reaction necessary to induce periprosthetic osteolysis, and this clearly appears to be of great clinical relevance. In recent years, tribology in manufacturing ceramic components has progressed with significant improvements, owing to the development of the latest generation of ceramic composites that allow for an increased material density and reduced grain size. Currently, ceramic-on-ceramic bearings are considered the attractive counterparts of ceramic- or metal-on-polyethylene ones for patients with a long life expectancy. The aim of this paper is to report the results of total hip replacements performed with a ceramic-on-ceramic articulation made from a ceramic composite in a single center, focusing on its usefulness in specific preoperative diagnosis.

Hip Profile in World Elite Junior Badminton Players: Impingement and Range of Motion Data from the World Junior Badminton Championship 2018

Badminton is played with repetitive high loading to the hip with lunging and jumps. In sports like soccer there is a high prevalence of femoroacetabular impingement syndrome in youth populations which may predispose them to osteoarthritis (OA). Internal rotation deficit in the hip of football players is a predictor of hip and groin pain and differences in the range of motion (ROM) of the hip between sex and different ethnicities exist. Early hip replacements in former elite badminton players due to OA seem to be a problem. There are no published values for ROM and impingement of the hip in badminton. The purpose is to report ROM and impingement of the hip in elite junior badminton players and to report any differences between sex and ethnicities. Players at the World Junior Championship 2018 were examined for hip flexion, rotation, and impingement test. Injury history was obtained from a questionnaire. Two hundred and eighty-four players of 433 aged 16 to 18 years were examined. One hundred and forty-three players answered the questionnaire. Females demonstrated greater hip ROM than males. In the dominant side hip flexion was (137.7 degrees [ ± 9.1] vs. 132.2 degrees [ ± 11.1], p < 0.001), internal rotation range of motion or IROM (60.0 degrees [ ± 10.9] vs. 49 degrees [ ± 11.1], p < 0.001) and external rotation range of motion or EROM (57.9 degrees [ ± 9.9] vs. 54.7 degrees [ ± 8.9], 0.004). Hip flexion was higher in Asian players compared with non-Asian players (139.1 degrees [ ± 8.4] vs. 130.3 degrees [ ± 10.7], p < 0.001). One hundred (35%) players had at least one positive impingement test. A possible relationship between a positive FADIR and a decrease in hip flexion was found in the dominant hip, OR 1.06 (1.02–1.11) p = 0.005. A total of 104 previous injuries lasting over 30 days were reported with five hip-related injuries. No correlation between injury and examinations was found. Females and Asians demonstrated higher ROM in the hip than males and non-Asians. Impingement of the hip is frequent and may be related to low hip flexion.

257. Outcomes in Fungal Prosthetic Joint Infection

Background There is a paucity of data in the literature regarding the most effective treatment and related outcomes of fungal prosthetic joint infection. The majority of reported cases are treated using a two stage revision method in which the initial prosthesis is removed and the patient is treated with systemic antifungal medications and potentially irrigation of the joint cavity with antifungal and antibacterial agents. Alternately, others have suggested a one-stage revision in order to prevent a period of significant functional impairment and potentially improved functional outcomes and lower overall costs. Cases of radical removal of the prosthesis without replacement have been reported. To date, the largest studies of total hip arthroplasty and total knee arthroplasty have included 37 and 45 patients, respectively. Methods A retrospective record review of patients admitted within two health systems between January 1, 2007 and December 31, 2018 with prosthetic joints and a deep culture of the joint positive for fungal organisms was performed. Results Eighteen patients fit criteria. Nine patients had knee replacements and nine patients had hip replacements. The average age at time of infection was 61. Ten patients were female. Average BMI was 32.1. Twelve presented with a painful joint, eight presented with drainage, and one with dehiscence. Average WBC count was 9.3, average ESR was 47, and average CRP was 11.8. All patients were noted with Candida species. Eight patients were treated with two stage revisions, three received one stage revisions as destination therapy. One required amputation. All but one patient was associated with concurrent bacterial infection. Of the twelve patients that had known outcomes, six were noted with cure and six were noted with relapse. All patients that were cured received two stage exchange or girdlestone procedure. Conclusion In our study, fungal prosthetic joint infection was associated with poor outcomes. All of the patients in our study were noted with Candida species, which is in concordance with the known literature. Two stage exchange was associated with better outcomes. Disclosures All Authors: No reported disclosures

The in vivo location of edge-wear in hip arthroplasties

Aims Acetabular edge-loading was a cause of increased wear rates in metal-on-metal hip arthroplasties, ultimately contributing to their failure. Although such wear patterns have been regularly reported in retrieval analyses, this study aimed to determine their in vivo location and investigate their relationship with acetabular component positioning. Methods 3D CT imaging was combined with a recently validated method of mapping bearing surface wear in retrieved hip implants. The asymmetrical stabilizing fins of Birmingham hip replacements (BHRs) allowed the co-registration of their acetabular wear maps and their computational models, segmented from CT scans. The in vivo location of edge-wear was measured within a standardized coordinate system, defined using the anterior pelvic plane. Results Edge-wear was found predominantly along the superior acetabular edge in all cases, while its median location was 8° (interquartile range (IQR) -59° to 25°) within the anterosuperior quadrant. The deepest point of these scars had a median location of 16° (IQR -58° to 26°), which was statistically comparable to their centres (p = 0.496). Edge-wear was in closer proximity to the superior apex of the cups with greater angles of acetabular inclination, while a greater degree of anteversion influenced a more anteriorly centred scar. Conclusion The anterosuperior location of edge-wear was comparable to the degradation patterns observed in acetabular cartilage, supporting previous findings that hip joint forces are directed anteriorly during a greater portion of walking gait. The further application of this novel method could improve the current definition of optimal and safe acetabular component positioning. Cite this article: Bone Joint Res 2021;10(10):639–649.

Total hip replacements following acetabular fractures. 7 to 15 years clinical and radiological results

This study is reporting the long term clinical and radiographic results of a group of 45 patients who underwent total hip arthroplasty following acetabular fractures. The study included 39 males and 6 females. The age of the patients ranged from 32 to 61 with a mean of 46.4 years. The indication for surgery was secondary osteoarthritis in 35 patients and avascular necrosis of the femoral head in the remaining ten. The follow up period ranged from 7 to 15 years with a median of 10.3 years. Uncemented total hip prostheses were used in 37 cases while 8 cases had hybrid prostheses with cemented cups and uncemented stems. Thirty patients (66.7%) needed autogenous acetabular bone grafting. There has been a statistically significant improvement from a preoperative mean Oxford hip score of 16 to a postoperative mean score of 39.8 (p < 0.001). At the end of follow up, two cases had revision for cup loosening. The complications included one case of transient sciatic nerve palsy, and two cases of heterotopic ossification. Currently, total hip replacement remains the best option for end stage post traumatic arthritis. There are technical challenges associated with this replacement surgery which the surgeon should be aware of.

Infectious complications of hip arthroplasty

The objective of the research is to study the causes and outcomes of infectious complications after total hip arthroplasty. The background of the research is the analysis of outcomes of 364 patients with complications after total hip arthroplasty; 369 cases, from 2005 to 2018. The infectious complications accounted for 21.7% (80 cases). The work involves clinical, radiological, microbiological, and statistical research methods. As a result of research causes of suppurative complications after total hip arthroplasty were: chronic infectious diseases of internal organs (t=3.37, p=0.001), instability of prosthetic components (t=3.14, p=0.002), over two previous surgical interventions involving the affected joint (t=2.43, p=0.005). In the treatment of periprosthetic infections, sanitizing interventions without the prosthetic components’ removal appeared efficient within only up to 3 weeks. If the sanitizing interventions were inconclusive, the double-stage revision prosthetics appeared adequate in a reliable number of cases (t = 11.2, p = 0.0028), namely 24, which amounted to 92.3%. In conclusion, it was concluded that the causes of periprosthetic infections were: diseases of the internal organs, instability of the components, over two surgical operations involving the same joint. The development of various complications after total hip replacements demands surgical revision procedures.