title: Osteochondral Allograft Transplantation for Femoral Trochlear Dysplasia.
abstract: BACKGROUND
  The risk factors for patellofemoral joint instability include laxity of medial patellar restraints, abnormal limb geometry, femoral and tibial malrotation, patella alta, and trochlear dysplasia. Femoral trochlear dysplasia is characterized by a hypoplastic or shallow trochlear groove.
  
  
  METHODS
  We report the case of a 31-year-old female with trochlear dysplasia and recurrent patella dislocations, laxity of the medial patellofemoral ligament (MPFL), and high-grade chondromalacia of the trochlea and the patella. Surgical treatment goals were to re-create a trochlear groove, restore bony restraint, and realign and offload the patella. First, a triplane tibial tubercle osteotomy (TTO) was performed, and the patella was everted 360° with a subvastus approach. The MPFL was reconstructed using a gracilis allograft. A fresh osteochondral allograft transplant trochlea was sized, and a 35-mm diameter graft was transplanted to re-create the groove. The TTO was secured in a new anterior, medial, and distal position. The patient was braced for 6 weeks and completed a rehabilitation protocol. At 9-month follow-up, she had made significant gains in range of motion (0°-140°) and activity compared to her preoperative status. She reported no pain or recurrent dislocations.
  
  
  CONCLUSIONS
  This case demonstrates a viable surgical option for treatment of instability resulting from trochlear dysplasia with patellofemoral chondromalacia. The osteochondral allograft transplantation surgery technique allows patients to have a stable, pain-free knee joint and participate in activities compared to nonoperative management. However, the long-term outcomes of this procedure are unknown.
authors.affiliation: Ochsner Sports Medicine Institute, Ochsner Clinic Foundation, New Orleans, LA.
authors.forename: Dharmpal V
authors.initials: DV
authors.lastname: Vansadia
authors.affiliation: Ochsner Sports Medicine Institute, Ochsner Clinic Foundation, New Orleans, LA.
authors.forename: James R
authors.initials: JR
authors.lastname: Heltsley
authors.affiliation: Ochsner Sports Medicine Institute, Ochsner Clinic Foundation, New Orleans, LA.
authors.forename: Scott
authors.initials: S
authors.lastname: Montgomery
authors.affiliation: Ochsner Sports Medicine Institute, Ochsner Clinic Foundation, New Orleans, LA.
authors.forename: Misty
authors.initials: M
authors.lastname: Suri
authors.affiliation: Ochsner Sports Medicine Institute, Ochsner Clinic Foundation, New Orleans, LA ; The University of Queensland School of Medicine, Ochsner Clinical School, New Orleans, LA.
authors.forename: Deryk G
authors.initials: DG
authors.lastname: Jones
keywords: Chondromalacia patellae; osteoarthritis–knee; patellar dislocation; patellofemoral joint