Rotator cuff repair with an interposition polypropylene mesh:A biomechanical ovine study

BACKGROUND Chronic large to massive rotator cuff tears are difficult to treat and re-tears are common even after surgical repair.We propose using a synthetic polypropylene mesh to increase the tensile strength of rotator cuff repairs.We hypothesize that using a polypropylene mesh to bridge the repair of large rotator cuff tears will increase the ultimate failure load of the repair.AIM To investigate the mechanical properties of rotator cuff tears repaired with a polypropylene interposition graft in an ovine ex-vivo model.METHODS A 20 mm length of infraspinatus tendon was resected from fifteen fresh sheep shoulders to simulate a large tear.We used a polypropylene mesh as an interposition graft between the ends of the tendon for repair.In seven specimens,the mesh was secured to remnant tendon by continuous stitching while mattress stitches were used for eight specimens.Five specimens with an intact tendon were tested.The specimens underwent cyclic loading to determine the ultimate failure load and gap formation.RESULTS The mean gap formation after 3000 cycles was 1.67 mm in the continuous group,and 4.16 mm in the mattress group(P=0.001).The mean ultimate failure load was significantly higher at 549.2 N in the continuous group,426.4 N in the mattress group and 370 N in the intact group(P=0.003).CONCLUSION The use of a polypropylene mesh is biomechanically suitable as an interposition graft for large irreparable rotator cuff tears.

Research Progress of Titanium Polypropylene Mesh in Breast Reconstruction

To investigate the application of titanium polypropylene mesh in breast reconstruction.In this study,we selected the literature data in recent 4 years to analyze the application of titanium polypropylene mesh in breast reconstruction.Using the keywords of"breast reconstruction,""titanium polypropylene mesh,^^"application"and"research progress,we analyzed and summarized the related research progress of titanium polypropylene mesh in breast reconstruction.The research was conducted using the analysis of titanium polypropylene mesh,titanium polypropylene mesh in breast reconstruction surgery advantages,adverse complications related to titanium polypropylene mesh in breast reconstruction surgery and preventive measures.By constantly improving these aspects in the research process,the current study has certain value,and may guide the research work of titanium mesh in breast reconstruction.

Tannic acid-loaded hydrogel coating endues polypropylene mesh with hemostatic and antiinflammatory capacity for facilitating pelvic floor repair

The application of polypropylene mesh(PPM)in pelvic organ prolapse(POP)treatment was severely limited by the complications associated with PPM,such as mesh exposure,chronic inflammatory reactions and postoperative hematoma.This study applied a method of fabricating a hydrogel-mesh complex(PPM+TA@GelMA)to cross-link tannic acid(TA)directly with Methacrylate Gelatin(GelMA)hydrogel and thus to form a coating for PPM.This one-step coating modification improved the hydrophilicity and cyto-compatibility of PPM.The hemostatic effect of PPMtTA@GelMA was confirmed through tail amputation test.Through the defect tissue repair experiments in vivo,it was proved that PPMtTA@GelMA had effects of anti-inflammation and promoting tissue repair and regulated the M2 subtype macrophages polarization for tissue repair.The TAloaded hydrogel coating endued PPM with multiple functions.It is believed that the novel hydrogel-mesh complex and its fabrication method will have great significance in basic research and clinical application.

Titanium-coated polypropylene mesh as innovative bioactive material in conservatives mastectomies and pre-pectoral breast reconstruction

Breast reconstruction is rapidly evolving,thanks to the growing acceptance of synthetic meshes as innovative biomaterials.276 patients undergoing mastectomy(total of 328 mastectomies)were analyzed in a retrospective observational study to evaluate the pre-pectoral immediate breast reconstruction(IBR)using an implant wrapped with Titanium-Coated Polypropylene Mesh(TCPM)vs.patients treated with tissue expander(TE),equally placed pre-pectorally(and wrapped with the same TCPM in 74.3%of the control group’breasts).163 patients,of the study group(SG),underwent mastectomy and pre-pectoral IBR with implant wrapped with TCPM,in a one-step surgery,called direct-to-implant technique(DTI),while 113 patients control group(CG)underwent mastectomy and TE.DTI technique has been performed in 192 breasts of the SG while TE procedure in 136 breasts of the CG.The BREAST-Q questionnaire has been provided before the treatment and 2 years later.Baker scale has been used to evaluate capsular contracture.Oncologic,surgical,and aesthetic outcomes along with BREAST-Q scores were analyzed.Additionally,a histologic evaluation was conducted in 11 capsules’samples randomly chosen(6 derived from SG patients and 5 derived from CG).Complications were recorded in 43 cases(29SG-14CG):8 skin-nipple necrosis(5SG-3CG),8 wound dehiscence(6SG-2CG),3 hematomas(1SG-2CG),and 24 infections(8SG-16CG).Grade IV capsular contracture was detected in 9 breasts(1SG-8CG),whereas 254 breasts were grade I(110SG-144CG),33(10SG-23CG)grade II,and 32(4SG-28CG)grade III.Implant wrinkling was detected in 18 cases(10SG-8CG)after 30 months.The local tumor recurrence rate was 5.8%.Three recurrences were on the nipple-areola complex(1.9%).SG patients showed significantly higher rates in the BREAST-Q overall Satisfaction with Outcome(74.1),overall Satisfaction with Breasts(69.1),Psychosocial Well-being(81.9),and Sexual Well-being(63.1),versus CG’s patients(p<0.05).Histological analysis showed a process of normal tissue repair with a complete mesh integration and normal healing.Conservative mastectomies with pre-pectoral IBR assisted by TCPM proved themselves oncologically safe,biologically integrated into native tissues,and highly accepted in terms of quality of life guaranteeing a more natural and aesthetic breast appearance.Core tip:This retrospective observational study provided clinical and histological outcomes of the pre-pectoral IBR using an implant wrapped with TCPM vs.patients treated with TE,equally placed pre-pectorally.The efficacy of IBR using an implant wrapped with TCPM was confirmed by the cosmetic results obtained and by a rate of side effects comparable to TE.All the histological analyses performed confirmed the TCPM mesh complete integration with the physiological aspects of healing:The Collagen 1 and 3 expressions did not differ,between TCPM and NO TCPM samples to confirm a process of healing overlapping to perfect device incorporation and normal healing.

An innovative technique of chest wall stabilization and reconstruction in traumatic flail chest:The figure-of-eight suture with polypropylene mesh and musculofascial flap

Surgical stabilization of the flail chest is challenging and has no established guidelines.Chest wall integrity and stability are the main factors that ensure the protection of intrathoracic organs and an adequate respiratory function.Here,we report a novel chest wall reconstruction technique in a 45-year-old man with a traumatic left flail chest and open pneumothorax diagnosed both clinically and radiographically.Rib approximation and chest wall reconstruction was done using intercostal figure-of-eight suture and polypropylene mesh with vascularized musculofascial flap.The patient improved gradually and was discharged after three weeks of total hospital stay.He returned to regular working after a month with no evidence of respiratory distress or paradoxical chest movement.Follow-up visit at one year revealed no lung hernia or paradoxical chest movement.This is a novel,feasible and cost-effective modification of chest wall reconstruction that can be adopted for thoracic wall repair in case of open flail chest,which needs emergency surgical interventions even in resource constraint settings.

Intestinal erosion caused by meshoma displacement:A case report

BACKGROUND A meshoma formation and erosion to the small intestine is rare.Herein,we report one case of a meshoma that was not treated early;causing it to displace and erode the small intestine,with infection,complete control of symptoms was achieved after removal of the infected patch mass,no recurrence of hernia after 2 years of follow-up.CASE SUMMARY A 62-year-old male patient presented with recurrent abdominal pain repeatedly for 1 wk,which has worsened 2 d before admition,accompanied by fever.Five years before presentation he underwent right inguinal hernia Plug and patch repair approach.Two years ago,a computed tomography scan revealed a right lower abdominal mass with soft tissue density,measuring approximately 30 mm×17 mm,which was diagnosed as meshoma that was not treated.The patient had poorly controlled diabetes in the past year.CONCLUSION The formation of meshoma is rare,and that if not treated in time it might erode and require resection of the involved organ.

Establishment and evaluation of an improved rat model of open abdomen

Introduction:This study aimed to establish an animal model of open abdomen(OA)through temporary abdominal closure via different techniques.Methods:Adult male Sprague-Dawley rats were randomly divided into three groups:group A(OA with polypropylene mesh alone);group B(OA with polypro-pylene mesh combined with a patch);and group C(OA with polypropylene mesh and a sutured patch).Vital signs,pathophysiological changes,and survival rates were closely monitored in the rats for 7 days after surgery.Abdominal X-rays and histopathological examinations were performed to assess abdominal organ changes and wound healing.Results:The results showed no significant difference in mortality rates among the three groups(p>0.05).However,rats in group B exhibited superior overall condi-tion,cleaner wounds,and a higher rate of wound healing compared to the other groups(p<0.05).Abdominal X-rays indicated that varying degrees of distal intestinal obstruction in all groups.Histopathological examinations revealed fibrous hyperpla-sia,inflammatory cell infiltration,neovascularization,and collagen deposition in all groups.Group B demonstrated enhanced granulation tissue generation,neovasculari-zation,and collagen deposition compared to the other groups(p<0.05).Conclusions:Polypropylene mesh combined with patches is the most suitable method for establishing an animal model of OA.This model successfully replicated the patho-logical and physiological changes in postoperative patients with OA,specifically the progress of abdominal skin wound healing.It provides a practical and reliable animal model for OA research.