Effects of tear size and location on predictions of supraspinatus tear propagation

Background: While previous studies have established several techniques for suture anchor repair of the acetabular labrum to bone during arthroscopic surgery, the current literature lacks evidence defining the appropriate number of suture anchors required to effectively restore the function of the labral tissue. Purpose/Hypothesis: To define the location and size of labral tears identified during hip arthroscopy for acetabular labral treatment in a large multicenter cohort. The secondary purpose was to differentiate the number of anchors used during arthroscopic labral repair. The hypothesis was that the location and size of the labral tear as well as the number of anchors identified would provide a range of fixation density per acetabular region and fixation method to be used as a guide in performing arthroscopic repair. Study Design: Cross-sectional study; Level of evidence, 3. Methods: We used a multicenter registry of prospectively collected hip arthroscopy cases to find patients who underwent arthroscopic labral repair by 1 of 7 orthopaedic surgeons between January 2015 and January 2017. The tear location and number of anchors used during repair were described using the clockface method, where 3 o’clock denoted the anterior extent of the tear and 9 o’clock the posterior extent, regardless of sidedness (left or right). Tear size was denoted as the number of “hours” spanned per clockface arc. Chi-square and univariate analyses of variance were performed to evaluate the data for both the entire group and among surgical centers. Results: A total of 1978 hips underwent arthroscopic treatment of the acetabular labrum; the most common tear size had a 3-hour span (n = 820; 41.5%). Of these hips, 1645 received labral repair, with most common repair location at the 12- to 3-o’clock position (n = 537; 32.6%). The surgeons varied in number of anchors per repair according to labral size ( P < .001 for all), using 1 to 1.6 anchors for 1-hour tears, 1.7 to 2.4 anchors for 2-hour tears, 2.1 to 3.2 anchors for 3-hour tears, and 2.2 to 4.1 for 4-hour tears. Conclusion: Variation existed in the number of anchor implants per tear size. When labral repair involved a mean clockface arc >2 hours, at least 2 anchor points were fixated.

Download Full-text

Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy

Materials ◽

10.3390/ma14071583 ◽

2021 ◽

Vol 14 (7) ◽

pp. 1583

Author(s):

Justyna Kasińska ◽

Marek Matejka ◽

Dana Bolibruchová ◽

Michal Kuriš ◽

Lukáš Širanec

Keyword(s):

Raw Materials ◽

Qualitative Evaluation ◽

Hot Tearing ◽

Material Content ◽

Negative Effect ◽

Increased Sensitivity ◽

Materials Used ◽

Shape Complexity ◽

Tear Propagation ◽

Hot Tearing Susceptibility

The main reason for the use of returnable material, or recycled alloys, is a cost reduction while maintaining the final properties of the casting. The casting resulting quality is directly related to the correct ratio of commercial grade alloy and alloy made by remelting the returnable material in the batch. The casting quality is also affected by the purity of the secondary raw materials used, the shape complexity and the use of the casting itself. The presented article focuses on the effect of increasing the returnable material content in the batch on the hot tearing susceptibility of AlSi9Cu3 alloy. Hot tears are a complex phenomenon that combines metallurgical and thermo-mechanical interactions of the cast metal. Hot tearing susceptibility was evaluated on the basis of quantitative (HTS — hot tearing susceptibility index) and qualitative evaluation. The negative effect of returnable material in the batch was already manifested at a 20% content in the batch. The critical proportion of the returnable alloy in the batch can be stated as 50%. The alloy with a 50% returnable material content manifested insufficient results of the HTS index and qualitative evaluation, which means increased sensitivity to tearing. The negative effect of returnable material and the increased sensitivity were also confirmed in the evaluation of the fracture surface and hot tear profile. The microstructure of alloys with 50% and higher proportion of returnable material was characterized by a higher amount of iron phases (mainly Al5FeSi), whose sharp ends acted as critical regions of hot tearing and subsequent hot tear propagation, which had a major impact on the increase in hot tearing susceptibility.

Download Full-text

Combined subacromial-subdeltoid bursitis and supraspinatus tear following a COVID-19 vaccination: A case report

Annals of Medicine and Surgery ◽

10.1016/j.amsu.2021.102819 ◽

2021 ◽

Vol 69 ◽

pp. 102819

Author(s):

Pattira Boonsri ◽

Chaiwat Chuaychoosakoon

Keyword(s):

Case Report ◽

Supraspinatus Tear

Download Full-text

Arthroscopic Repair of Anterosuperior Rotator Cuff Tears: In-Continuity Technique Vs. Disruption of Subscapularis-Supraspinatus Tear Margin

The Journal of Bone and Joint Surgery (American) ◽

10.2106/jbjs.n.00293 ◽

2014 ◽

Vol 96 (24) ◽

pp. 2056-2061 ◽

Cited By ~ 33

Author(s):

Sung-Jae Kim ◽

Min Jung ◽

Jae-Hoo Lee ◽

Chul Kim ◽

Yong-Min Chun

Keyword(s):

Rotator Cuff ◽

Arthroscopic Repair ◽

Rotator Cuff Tears ◽

Supraspinatus Tear

Download Full-text

Treatment of Full-Thickness Rotator Cuff Tendon Tear Using Umbilical Cord Blood-Derived Mesenchymal Stem Cells and Polydeoxyribonucleotides in a Rabbit Model

Stem Cells International ◽

10.1155/2018/7146384 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 8

Author(s):

Dong Rak Kwon ◽

Gi-Young Park ◽

Sang Chul Lee

Keyword(s):

Stem Cells ◽

Mesenchymal Stem Cells ◽

Motion Analysis ◽

Rabbit Model ◽

Full Thickness ◽

Tendon Tear ◽

Rotator Cuff Tendon ◽

Proliferating Cell ◽

Tear Size

Objective. The aim of this study was to investigate regenerative effects of ultrasound- (US-) guided injection with human umbilical cord blood-derived mesenchymal stem cells (UCB-MSCs) and/or polydeoxyribonucleotide (PDRN) injection in a chronic traumatic full-thickness rotator cuff tendon tear (FTRCTT) in a rabbit model. Methods. Rabbits (n=32) were allocated into 4 groups. After a 5 mm sized FTRCTT just proximal to the insertion site on the subscapularis tendon was created by excision, the wound was immediately covered by a silicone tube to prevent natural healing. After 6 weeks, 4 injectants (0.2 mL normal saline, G1-SAL; 0.2 mL PDRN, G2-PDRN; 0.2 mL UCB-MSCs, G3-MSC; and 0.2 mL UCB-MSCs with 0.2 ml PDRN, G4-MSC + PDRN) were injected into the FTRCTT under US guidance. We evaluated gross morphologic changes on all rabbits after sacrifice. Masson’s trichrome, anti-type 1 collagen antibody, bromodeoxyuridine, proliferating cell nuclear antigen, vascular endothelial growth factor, and platelet endothelial cell adhesion molecule stain were performed to evaluate histological changes. Motion analysis was also performed. Results. The gross morphologic mean tendon tear size in G3-MSC and G4-MSC + PDRN was significantly smaller than that in G1-SAL and G2-PDRN (p<0.05). However, there were no significant differences in the tendon tear size between G3-MSC and G4-MSC + PDRN. In G4-MSC + PDRN, newly regenerated collagen type 1 fibers, proliferating cell activity, angiogenesis, walking distance, fast walking time, and mean walking speed were greater than those in the other three groups on histological examination and motion analysis. Conclusions. Coinjection of UCB-MSCs and PDRN was more effective than UCB-MSC injection alone in histological and motion analysis in a rabbit model of chronic traumatic FTRCTT. However, there was no significant difference in gross morphologic change of tendon tear between UCB-MSCs with/without PDRN injection. The results of this study regarding the combination of UCB-MSCs and PDRN are worth additional investigations.

Download Full-text