101. Activity-Dependent Compensation at the Hip and Ankle at 8 Years After the Reconstruction of Isolated and Combined Posterior Cruciate Ligament Injuries.
- Author
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Agres, Alison N., Brisson, Nicholas M., Duda, Georg N., and Jung, Tobias M.
- Subjects
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BIOMECHANICS , *ANKLE , *WEIGHT-bearing (Orthopedics) , *DORSIFLEXION , *REPEATED measures design , *LEG , *THREE-dimensional imaging , *TASK performance , *COMPUTER software , *T-test (Statistics) , *STANDING position , *DYNAMICS , *KINEMATICS , *FUNCTIONAL assessment , *DESCRIPTIVE statistics , *POSTERIOR cruciate ligament injuries , *HIP joint , *ROTATIONAL motion , *KNEE joint , *ORTHOPEDIC surgery , *RESEARCH methodology , *SITTING position , *DIGITAL video , *PLASTIC surgery , *BODY movement , *KNEE , *ANKLE joint , *HEALTH outcome assessment , *GROUND reaction forces (Biomechanics) , *CONFIDENCE intervals , *STAIR climbing , *MOTION capture (Human mechanics) , *RANGE of motion of joints , *ACTIVITIES of daily living , *PHYSIOLOGY - Abstract
Background: After posterior cruciate ligament reconstruction (PCLR), functional deficits at the knee can persist. It remains unclear if neighboring joints compensate for the knee during demanding activities of daily living. Purpose: To assess long-term alterations in lower limb mechanics in patients after PCLR. Study Design: Descriptive laboratory study. Methods: A total of 28 patients who had undergone single-bundle unilateral isolated or combined PCLR performed stair navigation, squat, sit-to-stand, and stand-to-sit tasks at 8.2 ± 2.2 years after surgery. Motion capture and force plates were used to collect kinematic and kinetic data. Then, 3-dimensional hip, knee, and ankle kinematic data of the reconstructed limb were compared with those of the contralateral limb using statistical parametric mapping. Results: Side-to-side differences at the knee were primarily found during upward-driven movements at 8 years after surgery. The reconstructed knee exhibited lower internal rotation during the initial loading phase of stair ascent versus the contralateral knee (P =.005). During the sit-to-stand task, higher flexion angles during the midcycle (P =.017) and lower external rotation angles (P =.049) were found in the reconstructed knee; sagittal knee (P =.001) and hip (P =.016) moments were lower in the reconstructed limb than the contralateral limb. In downward-driven movements, side-to-side differences were minimal at the knee but prominent at the ankle and hip: during stair descent, the reconstructed ankle exhibited lower dorsiflexion and lower external rotation during the midcycle versus the contralateral ankle (P =.006 and P =.040, respectively). Frontal hip moments in the reconstructed limb were higher than those in the contralateral limb during the stand-to-sit task (P =.010); during squats, sagittal hip angles in the reconstructed limb were higher than those in the contralateral limb (P <.001). Conclusion: Patients after PCLR exhibited compensations at the hip and ankle during downward-driven movements, such as stair descent, squats, and stand-to-sit. Conversely, residual long-term side-to-side differences at the knee were detected during upward-driven movements such as stair ascent and sit-to-stand. Clinical Relevance: After PCLR, side-to-side differences in biomechanical function were activity-dependent and occurred either at the knee or neighboring joints. When referring to the contralateral limb to assess knee function in the reconstructed limb, concentric, upward-driven movements should be prioritized. Compensations at the hip and ankle during downward-driven movements lead to biases in long-term functional assessments. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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