title: Utilizing reamer irrigator aspirator (RIA) autograft for opening wedge high tibial osteotomy: A new surgical technique and report of three cases.
abstract: BACKGROUND
  The lateral closing wedge high tibial osteotomy (HTO) was popularized by Coventry in the 1960s. In the 1990s the medial opening wedge osteotomy gained popularity because it could achieve greater valgus correction and it did not require dissociation of the fibula from the tibia, an important consideration when treating varus knees with lateral and posterolateral ligament deficiencies (Noyes' double-varus and triple-varus knees). However, it has the disadvantage of requiring bone graft to fill bony defects. Recently, the reamer-irrigator-aspirator (RIA; Synthes, Paoli, PA) system was developed, and as a result of this procedure, a large amount of usable autogenous bone graft can be collected safely for use. To our knowledge, there is no published series combining opening wedge HTO with the use of RIA obtained autogenous bone graft.
  
  
  METHODS
  We present a novel technique in which a series of three patients underwent opening wedge HTO using ipsilateral, retrograde femur RIA graft to fill the bone defect. All patients had satisfactory clinical and radiologic outcomes following the new technique at latest follow up.
  
  
  CONCLUSIONS
  Opening wedge high tibial osteotomy is a well-documented and accepted orthopedic procedure, however, has the disadvantage of requiring varying amounts of bone graft. Traditionally, iliac crest or tricortical allograft have been the grafting modalities of choice, however both have inherent drawbacks to their use. In our series, the use of RIA autograft is a safe and reliable harvest technique for high tibial osteotomy, providing abundant and quality autogenous bone graft.
  
  
  CONCLUSIONS
  All three of our patients achieved radiographic union with high clinical patient satisfaction without any major complications. We feel this novel technique is a safe and acceptable operative solution grafting opening wedge osteotomies about the knee.
authors.affiliation: University of Kansas Medical Center, Department of Orthopedics, 3901, Rainbow Boulevard, Kansas City, KS 66160, United States. Electronic address: rseagrave@kumc.edu.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Seagrave
authors.affiliation: University of Kansas Medical Center, Department of Orthopedics, 3901, Rainbow Boulevard, Kansas City, KS 66160, United States. Electronic address: jsojka@kumc.edu.
authors.forename: John
authors.initials: J
authors.lastname: Sojka
authors.affiliation: University of Kansas Medical Center, Department of Orthopedics, 3901, Rainbow Boulevard, Kansas City, KS 66160, United States. Electronic address: agoodyear@kumc.edu.
authors.forename: Adam
authors.initials: A
authors.lastname: Goodyear
authors.affiliation: University of Kansas Medical Center, Department of Orthopedics, 3901, Rainbow Boulevard, Kansas City, KS 66160, United States. Electronic address: smunns@kumc.edu.
authors.forename: Stephen W
authors.initials: SW
authors.lastname: Munns
keywords: Allograft; Autograft; High tibial osteotomy; Reamer-irrigator-aspirator (RIA); Varus deformity