title: Reconstruction of the medial patellofemoral ligament using hamstring tendon graft with different methods: a biomechanical study.
abstract: OBJECTIVE
  To measure the tensile strength of the normal medial patellofemoral ligament (MPFL), and evaluate the biomechanics of different fixation methods of the hamstring tendon graft on the patella.
  
  
  METHODS
  Eight fresh cadaver knees were prepared by isolating the patella, leaving only the MPFL as its attachment to the medial condyle of femur. The MPFL was reconstructed by three different methods: four-suture fixation, anchors-single suture fixation, and anchors-double suture fixation. The tensile strength and the elongation of the normal MPFL and the tendon grafts were measured.
  
  
  RESULTS
  The tensile strength of the four-suture fixation group (234.86±49.02 N) was stronger than that of the normal MPFL (146.91±25.30 N, P=0.0014) and the anchors-single suture group (159.17±49.07 N, P=0.0077), while weaker than that of the anchors-double suture group (314.74±78.46 N, P=0.0052) CONCLUSIONS: With regard to the tensile strength, the four-suture fixation method is reliable for clinical use. Compared with the anchor-suture method, the four-suture fixation method which has no specific implants is more economical, convenient and efficient.
authors.affiliation: Department of Orthopedics, The 305 Hospital of Chinese People's Liberation Army, Beijing 100017, China.
authors.forename: Wei
authors.initials: W
authors.lastname: He
authors.affiliation: Department of Orthopedics, The 261 Hospital of Chinese People's Liberation Army, Beijing 100094, China.
authors.forename: Yu-ming
authors.initials: YM
authors.lastname: Yang
authors.affiliation: Department of Orthopedics, The 305 Hospital of Chinese People's Liberation Army, Beijing 100017, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.affiliation: Department of Orthopedics, General Hospital of Chinese People's Liberation Army, Beijing 100853, China.
authors.forename: Ai-yuan
authors.initials: AY
authors.lastname: Wang
authors.affiliation: Department of Orthopedics, General Hospital of Chinese People's Liberation Army, Beijing 100853, China.
authors.forename: Yu-jie
authors.initials: YJ
authors.lastname: Liu
mesh_terms: D001696:Biomechanical Phenomena; D005269:Femur / Q000601:surgery*; D006801:Humans; D017847:Patellar Ligament / Q000601:surgery*; D019651:Plastic Surgery Procedures / Q000379:methods*; D013710:Tendons / Q000637:transplantation*; D013718:Tensile Strength