Kine-Mri in Patellofemoral Instability
Condition: Affected and Unaffected Knee in Adoloescent
Study type: Interventional

Summary: 
      Purpose: The impact of kinematic-MRI (KINE-MRI) in the patellofemoral instability and
      anterior knee pain of the adolescents is rarely reported.Interest was to evaluate the
      patellofemoral joint biomechanics with KINE-MRI in adolescents with affected and unaffected
      knees in a case-control study.Methods: KINE-MRI was performed in 29 adolescents (affected
      knee group, AKG, n=29 and n=26 unaffected knee group, UAKG, n=26) aged 11-16 years with
      unilateral patellofemoral instability. For the control group invvestigators enrolled ten
      healthy age- and sex-matched volunteers (healthy knee group, HKG, n=19 ).The study
      parameters, Bisect Offset (BSO), Lateral Patellar Displacement (LPD), Patellar Tilt Angle
      (PTA), Sulcus Angle and Insall-Salvati ratio at 0, 10, 20 and 30 degrees of
      flexion-extension, were measured for the AKG patients (n=29), and UAKG patients (n=26) and
      the HKG subjects (n=19). Results: In a comparison between the AKG patients and the HKG
      subjects there was a significant difference in the BSO-ratio, LPD-test and PTA-test. In these
      parameters the difference between the AKG patients and the HKG subjects progressively
      increased towards the full extension of the knee. In the AKG and UAKG patients BSO-ratio at 0
      degree ranged between 0.5 and 1.2 in both groups, whereas the BSO-ratio in the HKG subjects
      ranged between 0.33 and 0.75 (P < .001). At the zero degree the LPD-test ranged between 0 and
      10 mm in the AKG patients and between 0 and 35 mm in the UAKG patients, whereas the lateral
      displacement-test ranged between 0 and 5 mm in the HKG subjects (P = .003). Patellar tilt
      angle-test ranged between -30 and 20 degrees in the AKG patients and between -30 and 24
      degrees in the UAKG patients and in the HKG subjects the PTA-test ranged between 10 and 24
      degrees (P < .001).Conclusion: The KINE-MRI could be a feasible method for the evaluation of
      patellar tracking in adolescents.
    

Detailed description: 
      Purpose: The impact of kinematic-MRI (KINE-MRI) in the patellofemoral instability and
      anterior knee pain of the adolescents is rarely reported.Interest was to evaluate the
      patellofemoral joint biomechanics with KINE-MRI in adolescents with affected and unaffected
      knees in a case-control study.Methods: KINE-MRI was performed in 29 adolescents (affected
      knee group, AKG, n=29 and n=26 unaffected knee group, UAKG, n=26) aged 11-16 years with
      unilateral patellofemoral instability. For the control group investigators enrolled ten
      healthy age- and sex-matched volunteers (healthy knee group, HKG, n=19 ).The study
      parameters, Bisect Offset (BSO), Lateral Patellar Displacement (LPD), Patellar Tilt Angle
      (PTA), Sulcus Angle and Insall-Salvati ratio at 0, 10, 20 and 30 degrees of
      flexion-extension, were measured for the AKG patients (n=29), and UAKG patients (n=26) and
      the HKG subjects (n=19). Results: In a comparison between the AKG patients and the HKG
      subjects there was a significant difference in the BSO-ratio, LPD-test and PTA-test. In these
      parameters the difference between the AKG patients and the HKG subjects progressively
      increased towards the full extension of the knee. In the AKG and UAKG patients BSO-ratio at 0
      degree ranged between 0.5 and 1.2 in both groups, whereas the BSO-ratio in the HKG subjects
      ranged between 0.33 and 0.75 (P < .001). At the zero degree the LPD-test ranged between 0 and
      10 mm in the AKG patients and between 0 and 35 mm in the UAKG patients, whereas the lateral
      displacement-test ranged between 0 and 5 mm in the HKG subjects (P = .003). Patellar tilt
      angle-test ranged between -30 and 20 degrees in the AKG patients and between -30 and 24
      degrees in the UAKG patients and in the HKG subjects the PTA-test ranged between 10 and 24
      degrees (P < .001).Conclusion: The KINE-MRI could be a feasible method for the evaluation of
      patellar tracking in adolescents.
    

Intervention name(s): Dynamic kine-mri
Intervention type(s): Other
Intervention description(s): Dynamic kinematic (KINE) magnetic resonance imaging (MRI) of the patellofemoral joint.
Allocation: Non-Randomized
Intervention model: Parallel Assignment
Masking: None (Open Label)
Primary purpose: Diagnostic
Keywords: Adoloescent, patellofemoral, instability,biomechanics, magnetic resonance imaging