title: Serial kinematic analysis of the canine hindlimb joints after deafferentation and anterior cruciate ligament transection.
abstract: OBJECTIVE
  Transection of the anterior cruciate ligament 2 weeks after ipsilateral hindlimb deafferentation leads to osteoarthritis of the knee joint within 3 weeks. We analyzed the gait of six dogs that underwent this procedure in order to identify kinematic changes that could account for this rapid joint degeneration. All animals were video taped, 1, 3, 6, 9 and 13 weeks after surgery while they trotted on a treadmill.
  
  
  RESULTS
  In each dog, extension of the hip, knee and ankle joints of the unstable limb was increased, and the yield phase of the unstable knee was delayed or attenuated. When killed, five of six dogs showed a large full-thickness cartilage ulcer on the distal and/or anterior surface of the medial femoral condyle of the unstable knee; in the sixth dog, a smaller ulcer was observed. However, the severity of pathology in each individual was not obviously related to difference among the dogs in postoperative joint kinematics.
  
  
  CONCLUSIONS
  These data, and results of prior studies in humans and dogs, suggest that knee hyperextension resulting from limb deafferentation, and knee instability resulting from anterior cruciate ligament transection, operate in concert to create a mechanical environment (i.e., increased tibiofemoral separation and changes in the loading of articular surfaces) that results in rapid joint breakdown.
authors.affiliation: Department of Anatomy, Indiana University, School of Medicine, Fort Wayne 46805, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Vilensky
authors.forename: B L
authors.initials: BL
authors.lastname: O'Connor
authors.forename: K D
authors.initials: KD
authors.lastname: Brandt
authors.forename: E A
authors.initials: EA
authors.lastname: Dunn
authors.forename: P I
authors.initials: PI
authors.lastname: Rogers
mesh_terms: D000344:Afferent Pathways / Q000601:surgery; D000704:Analysis of Variance; D000818:Animals; D016118:Anterior Cruciate Ligament / Q000601:surgery*; D004285:Dogs; D005080:Exercise Test; D005260:Female; D005684:Gait / Q000502:physiology*; D005727:Ganglia, Spinal; D015171:Ganglionectomy; D006614:Hindlimb; D007592:Joint Diseases / Q000473:pathology* / Q000503:physiopathology*; D011184:Postoperative Period; D014743:Videotape Recording