title: Evaluating augmentation with calcium phosphate cement (chronOS Inject) for bone defects after internal fixation of proximal tibial fractures: A prospective, multicenter, observational study.
abstract: Managing subchondral bone defects in proximal tibia fractures after plateau reduction is an important consideration. ChronOS Inject is a recently developed calcium phosphate bone substitute that shows relatively fast osteointegration.
  
  
  
  Using chronOS Inject during internal fixation of proximal tibial fractures provides a satisfactory treatment option that is both clinically and radiologically safe.
  
  
  
  Patients enrolled in this study were treated with chronOS Inject bone void filler, during internal fixation of proximal tibial fractures. Patients were evaluated preoperatively and at 6 weeks, 6 and 12 months postoperative. Radiographic union was assessed using plain films supplemented by CT scans. Pain, function and adverse events were collected at all visits. A total of 36 patients were enrolled in the study and treated according to a predetermined protocol. Seven of the 36 patients (19.4%) were lost to follow-up.
  
  
  
  Successful radiographic union was achieved in 27/29 (93.1%) of patients at final follow-up. Articular subsidence of>2mm only occurred in one patient. Statistical analysis showed significant improvements both in leg pain and knee function. Progress in knee function was observed in 93.1% (27/29) of patients from 6 weeks to 12 months. No product-related complications were reported.
  
  
  
  Successful union was achieved based on radiographic criteria as well as clinical outcomes. When managing bone defects after internal fixation of proximal tibial fractures, the use of chronOS Inject resulted in significant improvement of knee function and reduction of leg pain.
  
  
  
  Level IV, prospective observational study.
authors.affiliation: Department of Orthopedic Surgery, Kyungpook National University Hospital, 130 Dongduk-ro, Jung-gu, Daegu 41944, Republic of Korea. Electronic address: cwoh@knu.ac.kr.
authors.forename: C W
authors.initials: CW
authors.lastname: Oh
authors.affiliation: Department of Orthopedic Surgery, Hanyang University Guri Hospital, 153 Kyoungchun-ro, Guri-si, Gyeonggi-do 11923, Republic of Korea. Electronic address: kcpark@hanyang.ac.kr.
authors.forename: K C
authors.initials: KC
authors.lastname: Park
authors.affiliation: Department of Orthopedic Surgery, Hanyang University Guri Hospital, 153 Kyoungchun-ro, Guri-si, Gyeonggi-do 11923, Republic of Korea. Electronic address: darkpac@hanmail.net.
authors.forename: Y H
authors.initials: YH
authors.lastname: Jo
mesh_terms: D001843:Bone Cements / Q000627:therapeutic use*; D002130:Calcium Phosphates / Q000627:therapeutic use*; D005260:Female; D005593:Fracture Fixation, Internal; D017102:Fracture Healing; D006801:Humans; D065466:Lysholm Knee Score; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D011446:Prospective Studies; D016059:Range of Motion, Articular; D013978:Tibial Fractures / Q000145:classification / Q000000981:diagnostic imaging / Q000601:surgery*; D064232:Visual Analog Scale
chemical_list: D001843:Bone Cements; D002130:Calcium Phosphates; C020243:calcium phosphate
keywords: Bone defect; Calcium phosphate cement; Proximal tibial fractures