Cryopreserved, Thin, Laser-Etched Osteochondral Allograft maintains the functional components of articular cartilage after 2 years of storage

Variability in the Processing of Fresh Osteochondral Allografts

The indications for fresh osteochondral allograft continue to increase. As a result, variations in graft processing and preservation methods have emerged. An understanding of these techniques is important when evaluating the optimal protocol for processing fresh osteochondral allografts prior to surgical implantation. The aim of this study is to review the literature and understand various tissue processing protocols of four leading tissue banks in the United States. Donor procurement, serological and microbiological testing, and storage procedures were compared among companies of interest. Similarities between the major tissue banks include donor screening, aseptic processing, and testing for microorganisms. Variability exists between these companies with relation to choice of storage media, antibiotic usage, storage temperature, and graft expiration dates. Potential exists for increased chondrocyte viability and lengthened time-to-expiration of the graft through a protocol of delicate tissue handling, proper choice of storage medium, adding hormones and growth factors like insulin growth factor-1 (IGF-1) to serum-free nutrient media, and storing these grafts closer to physiologic temperatures.

Transplantation of Cryopreserved Olfactory Ensheathing Cells Restores Loss of Functions in an Experimental Model

In the past decades, the properties of olfactory ensheathing cells (OECs) have been widely investigated. Studies have shown that transplantation of OECs cultured from the olfactory bulb mediates axonal regeneration, remyelination and restores lost functions in experimental central nervous system (CNS) injury models. Autologously sourcing the cells from the nasal mucosa or the olfactory bulb to treat patients with spinal cord injuries would be ideal, but the cell yield achieved may be inadequate to cover the surface area of the lesions typically encountered in human spinal cord contusion injuries. Therefore, banking allogenic cryopreserved olfactory bulb cells from donors or generating cell lines could provide a marked increase in cell stock available for transplantation. This study is undertaken in two control and two intervention groups. The control groups have lesions alone and lesions with collagen gel but without cells. The intervention groups have either transplantation of primary cultured olfactory bulb OECs (bOECs) encapsulated in collagen gel or cryopreserved bulb OECs (CbOECs) encapsulated in collagen gel. Here, we report that transplantation of cryopreserved rat bOECs encapsulated in collagen restored the loss of function in a vertical climbing test in a unilateral C6-T1 dorsal root injury model. The loss of function returns in 80% of rats with injuries in about 3 weeks comparable to that we observed after transplantation of primary cultured bOECs. The regeneration axons induced by the transplant are identified by neurofilament antibodies and ensheathed by OECs. Our results indicate that cryopreserved OECs retain their properties of inducing axon regeneration and restoring loss of function in the experimental model. This is a step forward to translate the research into future clinical applications.

The effectiveness of internal fixation in the management of acute chondral fractures. A systematic review

INTRODUCTION

Chondral defects can be a particularly challenging clinical presentation. Because damaged cartilage does not heal itself, an evolution of multiple new surgical treatments designed specifically for cartilage repair and restoration have been introduced. Internal fixation has demonstrated good benefits in case reports and small qualitative studies. Our systematic review aimed to evaluate the effectiveness of internal fixation in the management of acute chondral fractures.

METHODS

A comprehensive search strategy was carried out using the NICE Healthcare Databases Advanced Search. The systematic review was prospectively registered with PROSPERO (CRD42022302976) and was performed in accordance with the PRISMA guidelines.

RESULTS

Eleven studies consisting of fifty patients were included in this systematic review. Seventy-eight percent of patients showed good results and twenty-two percent of the cases had excellent results. Ninety-two percent of patients returned to preoperative level of sport activities at the end of the follow-up period. All of them returned to the original activity level without pain, stiffness, or restriction of movement after 1 year latest. The majority of patients had no complications at all, good recovery time and satisfactory outcomes for pain and activity level. The only complications presented were patella instability and quadriceps weakness.

CONCLUSION

Internal fixation for acute chondral fractures is an effective method to treat acute chondral fractures in both adolescents and young adults that want to get back to an active lifestyle. However, more data examining the long-term functional status, quality of life (QoL), recovery post-injury and pain free sports activity involvement are needed.

Fresh Frozen Rib Cartilage Grafts in Revision Rhinoplasty: A 9-Year Experience

BACKGROUND

Revision rhinoplasty is undoubtedly one of the most challenging procedures in facial plastic surgery. The complexity is compounded when there is a paucity of native septal cartilage to perform the required framework reconstruction. Harvest of autologous costal cartilage can result in increased operative times and possible secondary-site complications such as contour irregularity, poor scarring, and even pneumothorax.

METHODS

A retrospective review was conducted of the senior author's (R.J.R.) patients from 2011 to 2020 who underwent primary or revision rhinoplasty. Inclusion criteria consisted of patients with fresh frozen off-the-shelf cartilage used in revision rhinoplasty only with a minimum of 6 months' follow-up. Outcomes for evaluation were warping, resorption, displacement, and infection.

RESULTS

The authors identified 226 patients who underwent open rhinoplasty with the use of fresh frozen rib cartilage grafts and met inclusion criteria. The mean follow-up period was 12.18 months (range, 6 months to 8 years). The majority of patients had undergone one prior rhinoplasty procedure (54 percent); however, 4 percent of patients had undergone four or more prior procedures on their nose. The overall infection rate was 2.7 percent ( n = 6), with the majority successfully managed with antibiotics alone (2.3 percent).

CONCLUSIONS

The results in revision rhinoplasty are significantly enhanced with the creation of a stable nasal framework using off-the-shelf, easily accessible, specifically tailored fresh frozen cadaveric rib grafts. The long-term outcomes and complication rate in this 9-year retrospective study demonstrates the safety of fresh frozen rib graft in comparison to autologous or irradiated rib graft.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.

OUP accepted manuscript

Advances in regenerative medicine manufacturing continue to be a priority for achieving the full commercial potential of important breakthrough therapies. Equally important will be the establishment of distribution chains that support the transport of live cells and engineered tissues and organs resulting from these advanced biomanufacturing processes. The importance of a well-managed distribution chain for products requiring specialized handling procedures was highlighted during the COVID-19 pandemic and serves as a reminder of the critical role of logistics and distribution in the success of breakthrough therapies. This perspective article will provide insight into current practices and future considerations for creating global distribution chains that facilitate the successful deployment of regenerative medicine therapies to the vast number of patients that would benefit from them worldwide.