title: Induction of bone ingrowth with a micropore bioabsorbable suture anchor in rotator cuff tear: an experimental study in a rabbit model.
abstract: BACKGROUND
  The bioabsorbable suture anchor is probably one of the most commonly used tools in arthroscopic shoulder operations. However, there is controversy about whether the bioabsorbable anchor is replaced by bone. The object of this study is to evaluate bone ingrowth into the micropore bioabsorbable suture anchor and the differences in the biomechanical properties of a micropore anchor and a nonpore anchor.
  
  
  METHODS
  A total of 16 microsized holes (diameter, 250 ± 50 μm; depth, 0.2 mm) were made on the bioabsorbable anchors with a microdrill. Twelve adult New Zealand White rabbits were randomly divided into two groups: group A (n = 6), the nonpore bioabsorbable suture anchor group, and group pA (n = 6), the micropore bioabsorbable suture anchor group. Microcomputed tomography was used at 4 and 8 weeks postoperatively to evaluate ingrowth by bone volume fraction (BVF), which was measured by calculating the ratio of the total volume of bone ingrowth to that of the region of interest. For pullout strength testing, 3 additional rabbits (6 limbs) were used for mechanical testing.
  
  
  RESULTS
  The mean BVF was higher in group pA (0.288 ± 0.054) than in group A (0.097 ± 0.006). The micropore anchor had a higher pullout strength (0.520 ± 0.294 N) than the nonpore anchor (0.275 ± 0.064 N).
  
  
  CONCLUSIONS
  Micropore bioabsorbable suture anchors induced bone ingrowth and showed higher pullout strength, despite processing.
authors.affiliation: Department of Biomedical Engineering, College of Biomedical, Inje University, Kimhae, South Korea.
authors.forename: Yun Gyeong
authors.initials: YG
authors.lastname: Kang
authors.forename: Jung-Han
authors.initials: JH
authors.lastname: Kim
authors.forename: Jung-Woog
authors.initials: JW
authors.lastname: Shin
authors.forename: Jong-Min
authors.initials: JM
authors.lastname: Baik
authors.forename: Hye-Jung
authors.initials: HJ
authors.lastname: Choo
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001696:Biomechanical Phenomena; D004195:Disease Models, Animal; D058430:Humeral Head / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D016348:Osseointegration; D011817:Rabbits; D017006:Rotator Cuff / Q000601:surgery*; D000070636:Rotator Cuff Injuries; D053441:Suture Anchors; D013718:Tensile Strength; D055114:X-Ray Microtomography
keywords: Animal Model; Basic Science; Bioabsorbable anchor; Biomechanics/Imaging; humeral head; micropored; pullout strength; rotator cuff