title: Lateral patellofemoral ligament reconstruction to restore functional capacity in patients previously undergoing lateral retinacular release.
abstract: OBJECTIVE
  To study patient outcomes after surgical correction for iatrogenic patellar instability.
  
  
  METHODS
  This retrospective study looked at 17 patients (19 knees) suffering from disabling medial patellar instability following lateral release surgery. All patients underwent lateral patellofemoral ligament (LPFL) reconstruction by a single surgeon. Assessments in all 19 cases included functional outcome scores, range of motion, and assessment for the presence of apprehension sign of the patella to determine if LPFL reconstruction surgery was successful at restoring patellofemoral stability.
  
  
  RESULTS
  No patients reported any residual postoperative symptoms of patellar instability. Also no patients demonstrated medial patellar apprehension or examiner induced subluxation with the medial instability test described earlier following LPFL reconstruction. Furthermore, all patients recovered normal range of motion compared to the contralateral limb. For patients with pre and postoperative outcome scores, the mean overall knee injury and osteoarthritis outcome score increased significantly, from 34.39 preoperatively (range: 7.7-70.12) to 69.54 postoperatively (range: 26.82-91.46) at final follow-up (P < 0.0001).
  
  
  CONCLUSIONS
  This novel technique for LPFL reconstruction is effective at restoring lateral restraint of the patellofemoral joint and improving joint functionality.
authors: Mitch Beckert, Dylan Crebs, Michael Nieto, Yubo Gao, John Albright, Department of Orthopedics, University of Iowa, Iowa City, IA 52240, United States.
authors: Mitch
authors: M
authors: Beckert
authors: Mitch Beckert, Dylan Crebs, Michael Nieto, Yubo Gao, John Albright, Department of Orthopedics, University of Iowa, Iowa City, IA 52240, United States.
authors: Dylan
authors: D
authors: Crebs
authors: Mitch Beckert, Dylan Crebs, Michael Nieto, Yubo Gao, John Albright, Department of Orthopedics, University of Iowa, Iowa City, IA 52240, United States.
authors: Michael
authors: M
authors: Nieto
authors: Mitch Beckert, Dylan Crebs, Michael Nieto, Yubo Gao, John Albright, Department of Orthopedics, University of Iowa, Iowa City, IA 52240, United States.
authors: Yubo
authors: Y
authors: Gao
authors: Mitch Beckert, Dylan Crebs, Michael Nieto, Yubo Gao, John Albright, Department of Orthopedics, University of Iowa, Iowa City, IA 52240, United States.
authors: John
authors: J
authors: Albright
keywords: Knee; Lateral patellofemoral ligament; Orthopedics; Patellar instability; Sports medicine