Background and Objectives: Achilles tendon ruptures in middle-aged individuals with systemic comorbidities represent a growing clinical challenge. Revision surgery, indicated in cases of tendon re-rupture, remains technically demanding and lacks standardized treatment protocols. This comprehensive review aimed to summarize current evidence regarding indications, outcomes, and complications associated with the most commonly employed revision techniques and explores the potential of artificial intelligence (AI) in improving management and outcomes. Materials and Methods: A literature review was performed in accordance with PRISMA guidelines. The PubMed, MEDLINE, and Cochrane Central databases were used to search keywords. We included articles (1) reporting indications, outcomes, and/or complications of revision surgery for Achilles tendon rupture; (2) reporting a minimum mean follow-up of >12 months; and (3) written in English. Six studies met the inclusion criteria, with a total of 3250 patients analyzed. A methodological quality assessment using the Modified Newcastle–Ottawa Quality Assessment Scale was performed, and all articles were found to be of high quality. Results: Surgical strategies were stratified based on defect size: 5 cm: fascial turndown flaps, autografts (e.g., semitendinosus), or allografts. Tendon transfers showed satisfactory functional outcomes but varied in complication rates. Allografts offered reduced donor site morbidity. The use of AI and wearable sensors has demonstrated potential in preoperative planning, complication prediction, and real-time rehabilitation monitoring. Conclusions: Achilles tendon revision surgery requires a patient-specific, defect-oriented approach. Combined surgical techniques are often necessary for large or non-viable lesions. The integration of AI represents a promising advancement in enhancing surgical decision-making, optimizing rehabilitation, and improving long-term clinical outcomes.

The concept of dual mobility (DM) is currently approved as a valid option for reducing the risk of dislocation, with an incidence ranging from 0% to 4.6%. The principle is to achieve a high joint stability through a large diameter polyethylene (PE) liner, and to reduce cutting forces due to a "low-friction" head-liner coupling mechanism. From March 2015 to March 2020, 138 patients were treated with Dualis Cup (Gruppo Bioimpianti-Peschiera Borromeo, MI, Italy) for a total of 141 implants (three cases were bilateral). The average age at the time of the surgery was 77. Patients' clinical and X-ray follow-up was at 1, 3, 6, 12 months and then once a year. Seven patients (4.9%) had complications which required a second surgery, but only one case (0.7%) of intraprosthetic dislocation (which required cup revision), was directly ascribable to the DM cup. Improvements in design and materials of the third generation DM cups allowed both to reduce the rate of dislocations in high-risk patients (i.e., patients with neuro-muscular diseases and cognitive disorders, patients needing revisions, osteosynthesis failures, femoral neck fractures) and to achieve a survival rate similar to standard cups, ensuring a range of motion (ROM) very close to the physiological one. In our brief experience, Dualis Cups showed results comparable to those reported in the literature for Dual Mobility. If this data is confirmed by long-term studies, the use of DM cups could be extended even for young patients with high functional demands. (www.actabiomedica.it).

The Authors report a case of a 46 years old man affected by severe acute respiratory syndrome caused by Novel Coronavirus 2019 and admitted to our hospital. The patient required continuous positive airway pressure therapy (CPAP) in the hospital ward and subsequently orotracheal intubation while in intensive care unit. The patient laid in lateral decubitus position for several hours every day while receiving CPAP therapy. During the hospitalization, he reported limitation of range of motion of the left upper limb, without any history of acute or previous trauma. The clinical appearance of the arm was suggestive of pseudoparalytic shoulder.