Subacromial Bursa: A Neglected Tissue Is Gaining More and More Attention in Clinical and Experimental Research.

The subacromial bursa has long been demolded as friction-reducing tissue, which is often linked to shoulder pain and, therefore, partially removed during shoulder surgery. Currently, the discovery of the stem cell potential of resident bursa-derived cells shed a new light on the subacromial bursa. In the meanwhile, this neglected tissue is gaining more attention as to how it can augment the regenerative properties of adjacent tissues such as rotator cuff tendons. Specifically, the tight fibrovascular network, a high growth factor content, and the large progenitor potential of bursa-derived cells could complement the deficits that a nearby rotator cuff injury might experience due to the fact of its low endogenous regeneration potential. This review deals with the question of whether bursal inflammation is only a pain generator or could also be an initiator of healing. Furthermore, several experimental models highlight potential therapeutic targets to overcome bursal inflammation and, thus, pain. More evidence is needed to fully elucidate a direct interplay between subacromial bursa and rotator cuff tendons. Increasing attention to tendon repair will help to guide future research and answer open questions such that novel treatment strategies could harvest the subacromial bursa's potential to support healing of nearby rotator cuff injuries.

Restarting Orthopaedic Care in a Pandemic: Ethical Framework and Case Examples.

The question about how to resume typical orthopaedic care during a pandemic, such as coronavirus disease 2019, should be framed not only as a logistic or safety question but also as an ethical question. The current published guidelines from surgical societies do not explicitly address ethical dilemmas, such as why public health ethics requires a cessation of nonemergency surgery or how to fairly allocate limited resources for delayed surgical care. We propose ethical guidance for the resumption of care on the basis of public health ethics with a focus on clinical equipoise, triage tiers, and flexibility. We then provide orthopaedic surgery examples to guide physicians in the ethical resumption of care.