Background and Objectives: Total knee arthroplasty (TKA) is the most effective treatment method for end-stage osteoarthritis. One of the most important aspects of this surgery is adequate implant positioning, as it guarantees the desired outcome of restoring limb biomechanics. Surgical technique is being continuously improved along with hardware development. There are two novel devices designed to help establish proper femoral component rotation: soft-tissue tensor and robotic–assisted TKA (RATKA). This study compared the femoral component rotation achieved with the use of three methods: RATKA, soft tissue tensioner and the conventional measured-resection technique, all of them utilizing anatomical design prosthesis components. Materials and Methods: A total of 139 patients diagnosed with end-stage osteoarthritis underwent total knee arthroplasty between December 2020 and June 2021. After the surgery, they were divided into three groups depending on procedure technique and implant type: Persona (Zimmer Biomet) + Fuzion Balancer, RATKA + Journey II BCS or conventional TKA + Persona/Journey. Postoperatively, a computed tomography examination was performed in order to measure femoral component rotation. All three groups were compared independently during statistical analysis. Fisher’s exact, Kruskal–Wallis and Dwass–Steel–Crichtlow–Fligner tests were used for particular calculations. Results: Statistically significant differences in femoral component rotation between groups were noticed. However, in terms of values other than 0° in external rotation, no significant variance was revealed. Conclusions: Additional total knee arthroplasty instruments seem to improve the outcomes of the surgery, providing better component positioning than in the conventional measured-resection technique based only on bone landmarks.

Anterior knee pain (AKP) is one of the reasons for dissatisfaction after total knee replacement (TKR). It may result from patellofemoral joint dysfunction, caused by improper rotation of implant components. The aim of this study was to analyze patella positioning in patients after standard measured resection TKR and TKR with a use of a dynamic tensioner, and to assess the frequency of AKP, range of motion (ROM), and patient-reported outcome measures 6 weeks and 3 months postoperatively. The study consisted of 127 patients who underwent TKR. Eighty-nine of them treated with use of the dynamic tensioner FUZION formed the study group; the remainder formed the control group. All participants received cemented PERSONA MC without patella resurfacing. All patients had a standard anteroposterior, lateral weight-bearing, long-leg view X-ray and computed tomography examination in 30° of knee flexion following the procedure. There were no significant differences between the study and the control groups regarding: posterior condylar axis (PCA)-patella angle, surgical transepicondylar axis (sTEA)-patella angle, PCA-sTEA angle, deviation from 90° in PCA-patella, sTEA-patella and PCA-sTEA angles. No significant difference was found in a ratio of obtaining PCA-patella angle deviation of more than 3°. Regarding clinical parameters, statistically and questionablly clinically significant difference in favor of the Study Group was found in Forgotten Joint Score 6 weeks and 3 months post-operativley and ROM 6 weeks post-operatively. However, such difference was not found by analyzing ROM 3 months post-operatively, AKP and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scores. Compared with the standard 3° of femoral component external rotation, use of a dynamic tensioner does not allow for more accurate restoration of the patellar facet position with reference to the PCA.

Introduction: Total hip arthroplasty (THA) is nowadays considered as the most effective treatment option for end-stage hip osteoarthritis (OA) and one of the most successful orthopedic procedures. Precise reproduction of the center of rotation (COR) is among the most important aspects of...

BACKGROUND Cervical disc prosthesis (CDP) is a well-established treatment for cervical degenerative disc disease. It provides motion preservation and decreases adjacent segment degeneration associated with ACDF. It is highly effective, with a low failure rate, but rare complications, including prosthesis migration, can occur. The posterior migration of a CDP is extremely rare, and only a few cases have been described in the literature. This report describes a unique case of posterior intraprosthetic dislocation of a Mobi-C prosthesis and adds valuable knowledge about this rare complication. CASE REPORT A 50-year-old female non-smoker underwent C6-C7 discectomy with implantation of the Mobi-C prosthesis for cervical disc herniation causing radicular pain and paresthesia. The initial postoperative results were good, with remission of neurological symptoms and no complications. However, after 2.5 years, she presented with neck pain and numbness of the right upper limb after routine physical activity. Imaging studies, including computed tomography (CT), revealed a posterior migration of the polyethylene insert with compression of the spinal cord. Revision surgery was undertaken comprising removal of the dislocated prosthesis and conversion to ACDF using the Anchor C system. Complete symptom resolution was achieved, and implants were properly aligned without complication in this procedure. CONCLUSIONS Posterior intraprosthetic dislocation of the Mobi-C prosthesis is an extremely rare complication. This case report with long-term follow-up shows ACDF is an effective method of salvage. Further investigation is necessary for understanding failure mechanisms, and development of CDP design is needed to avoid such complications.

Introduction: Conversion disorders are characterized by the presence of motor or sensory dysfunction, resulting in significant discomfort or disability, the occurrence of which is not justified by any somatic disease. Psychogenic blindness, a specific manifestation of conversion disorders, refers to the loss or impairment of vision that cannot be attributed to any organic abnormalities in the eyes or visual system. The exact mechanisms underlying psychogenic blindness are not fully understood, but it is believed to involve complex interactions between the brain, visual pathways, and psychological processes. This systematic review aims to summarize reported cases of blindness in conversion disorders. Material and methods: A comprehensive search of the MEDLINE and Embase databases identified 13 relevant articles reporting a total of 17 patients with psychogenic blindness. Results: The risk and triggering factors for psychogenic blindness included acute stress (for example acute physical injury), chronic stressful situations (such as chronic health problems, disruptions in family relationships), and multiple factors including coexisting psychiatric conditions (like anxiety or other conversion disorders). The course of blindness varied among patients, with duration ranging from hours to years. Diagnostic methods involved thorough ophthalmic and neurological examinations, brain imaging, and psychiatric evaluations. Conclusions: This review provides valuable insights into managing patients with psychogenic blindness. The findings highlight the need for a multidisciplinary approach involving ophthalmologists, neurologists, and mental health specialists. Further research is required to elucidate the underlying mechanisms and develop effective treatment strategies for individuals with psychogenic blindness. Keywords: psychogenic blindness, conversion disorders, causes

Introduction: Total knee arthroplasty (TKA) is a commonly performed surgery that can successfully treat end-stage osteoarthritis (OA). Obesity is a known risk factor for OA and its progression, but its impact on postoperative satisfaction and implant sizing remains unclear. The current study aimed to assess the association of preoperative body mass index (BMI) and lower limb dimensions with TKA component sizing and patient-reported outcomes. Material and methods: We retrospectively assessed 108 patients (43 males, 65 females) undergoing primary TKA with a Journey II BCS prosthesis, without patellar resurfacing, between January and November 2023. The mean patient age was 67.4 ±4.1 years, with a mean BMI of 29.3 ±3.9 kg/m². Patients were divided into 2 groups based on BMI: normal weight (< 25; n = 41) and overweight/obese (≥ 25; n = 67). Lower limb widths and component sizes were obtained from postoperative radiographs and protocols. Clinical outcomes were evaluated using the KOOS and WOMAC questionnaires. Statistical analysis was performed to assess correlations between BMI, limb dimensions, implant size, and patient satisfaction. Results: Significant differences were found between the normal-weight and overweight patients in the diameters of the femoral (15.8 ±2.1 cm vs. 17.3 ±1.9 cm, p = 0.02) and lower leg (14.0 ±1.5 cm vs. 12.5 ±1.2 cm, p = 0.002) areas. However, no significant correlation was found between BMI, limb dimensions, and implant size for the femoral (p = 0.94) and tibial components (p = 0.48). Although patient-reported outcomes were similar between groups, with slightly better results in the normal-weight group, no statistical significance was found. Conclusions: Body mass index affects lower limb sizes but does not predict implant sizing in TKA. Furthermore, no difference in patient satisfaction postoperatively between BMI categories was observed. The findings indicate that demographic factors may not be adequate to achieve precision in preoperative templating. Instead, surgical planning should be individualized, based on comprehensive anatomical measurements.