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Introduction. Tendinopathies are a common cause of disability among the general population, and their management is challenging due to the degenerative nature of these disorders. The aim of this paper is to perform a scoping review of the available clinical evidence on the application of cell-based therapies for the management of elbow and rotator cuff tendinopathies, in order to summarize the current application methods and to shed light on the therapeutic potential and current limitations of these biologic approaches. Materials and Methods. A scoping review of the literature was performed on the PubMed and Scopus databases using the following inclusion criteria: clinical reports of any level of evidence, written in English, with no time limitation, on the use of cell-based approaches to treat rotator cuff or elbow tendinopathies, including studies on biological augmentation during the surgical procedure. Exclusion criteria were as follows: case reports or mini case series (<5 patients), articles not written in English, and reviews. Relevant data were then extracted and collected in a single database with the consensus of the two observers to be analyzed for the purposes of the present manuscript. Results. Seven papers dealing with rotator cuff tears were included. Four of them investigated the effect of injections, either MSCs alone or in combination with PRP, whereas three studies investigated the use of MSCs in combination with surgery. In all cases, an improvement was found in terms of clinical scores, with even evidence of tendon healing documented at second-look arthroscopy. Six papers dealt with elbow tendinopathies: three studies described the use of MSCs either with or without surgery, reporting significant clinical improvement and three studies analyzed the use of different types of cells (collagen-producing cells and autologous tenocytes) and, even in this case, clinical improvement was reported. Conclusion. All the papers included suggested a beneficial role of cell-based approaches to treat common upper limb tendinopathies, with an overall satisfactory safety profile. However, the lack of high-level evidence and the presence of controversial issues, such as interproduct variability, harvest source, and application strategies, do not allow standardization of these novel biologic approaches, whose efficacy needs to be confirmed with properly designed randomized trials.

Meniscal degeneration is a common finding even in young patients’ knees, and it is regarded as a predictor for the onset of early osteoarthritis (OA). When symptomatic, it represents a challenge since arthroscopic surgery provides unpredictable results: recent evidence has shown that partial meniscectomy is not better than conservative management up to 2 years of follow-up, and the removal of meniscal tissue may accelerate OA progression toward OA. Intra-articular injection of corticosteroids or hyaluronic acid may help in providing temporary symptomatic relief, but no influence should be expected on the quality of the meniscal tissue. Biologic agents have been adopted to treat a variety of degenerative musculoskeletal pathologies, and the use of platelet-derived growth factors (GFs) has become routine. Preclinical studies have documented that platelet-derived GFs may play a beneficial role in stimulating meniscal repair and regeneration by triggering anabolic pathways and stimulating local mesenchymal stem cells from synovium. Furthermore, also mechanical stimulation (e.g., arthroscopic trephination or percutaneous needling) in the red-red or red-white zone may further promote tissue healing. The purpose of the present brief report is to describe the clinical outcomes at 18 months’ follow-up in a cohort of patients affected by symptomatic medial meniscus degeneration and treated by percutaneous needling plus intra- and perimeniscal injection of autologous conditioned plasma (ACP). The procedure was shown to be safe and provided significant pain reduction and improvement in subjective scores. This treatment option deserves further investigation in a comparative setting, to establish whether it could offer advantage over isolated intra-articular injections.