Rotator cuff (RTC) repair outcomes are unsatisfactory due to the poor healing capacity of the tendon bone interface (TBI). In our preceding study, tendon hydrogel (tHG), which is a type I collagen rich gel derived from human tendons, improved biomechanical properties of the TBI in a rat chronic RTC injury model. Here we investigated whether adipose‐derived stem cell (ASC)‐seeded tHG injection at the repair site would further improve RTC healing. Rats underwent bilateral supraspinatus tendon detachment. Eight weeks later injured supraspinatus tendons were repaired with one of four treatments. In the control group, standard transosseous suture repair was performed. In the ASC, tHG, tHGASC groups, ASC in media, tHG, and ASC‐seeded tHG were injected at repair site after transosseous suture repair, respectively. Eight weeks after repair, the TBI was evaluated biomechanically, histologically, and via micro CT. Implanted ASCs were detected in ASC and tHGASC groups 7 weeks after implantation. ACS implantation improved bone morphometry at the supraspinatus insertion on the humerus. Injection of tHG improved biomechanical properties of the repaired TBI. RTC healing in tHGASC group was significantly better than control but statistically equivalent to the tHG group based on biomechanical properties, fibrocartilage area at the TBI, and bone morphometry at the supraspinatus insertion. In a rat RTC chronic injury model, no biomechanical advantage was gained with ASC augmentation of tHG. Clinical Significance: Tendon hydrogel augmentation with adipose derived stem cells does not significantly improve TBI healing over tHG alone in a chronic rotator cuff injury model. © 2019 Orthopaedic Research Society. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
Introduction Enhanced recovery after surgery pathways designed to optimize postoperative care have become increasingly popular across multiple surgical specialties with proven benefits. In this retrospective cohort study, we present a comparative evaluation of the impact of protocol-based postoperative care on free autologous breast reconstruction patients. Methods With institutional review board approval, we performed a chart review of patients who underwent breast reconstruction with free autologous tissue transfer by a single surgeon from 2006 to 2017. Patients were managed according to a postoperative protocol since 2006 that initially called for discharge home on postoperative day (POD) 4 for unilateral cases and POD 5 for bilateral cases. In May 2015, the protocol was revised to discharge home on POD 3 for all cases. Patients who underwent reconstruction before (2006 to April 2015) and after (May 2015 to 2017) the change in postoperative protocol were compared. Results A total of 432 patients (647 breasts) underwent free autologous breast reconstruction during the study period. Flaps were predominantly muscle-sparing transverse rectus abdominis myocutaneous (56.3%) or deep inferior epigastric perforator (30.3%) flaps. Average patient age was 51.6 years (range, 29.7–80.3 years). Unilateral reconstructions were performed for 167 patients before and 50 patients after the protocol change; average hospital length of stay (LOS) was 4.5 and 3.4 days, respectively (P < 0.001). Bilateral reconstructions were performed for 153 patients before and 62 patients after the protocol change; average hospital LOS was 5.1 and 3.5 days, respectively (P < 0.001). There was no significant increase in patients with major or minor complications. Conclusions Revising our postoperative protocol to reduce expected LOS was associated with an overall faster time to discharge without negative consequences in patients who underwent unilateral and bilateral free autologous breast reconstruction. Use of protocols to guide behavior not only can improve the patient experience by promoting a quicker return home, but may also have the added benefit of decreasing healthcare expenditures through reduced inpatient utilization.
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