PNF and Movement 2024; 22(3): 387-393
https://doi.org/10.21598/JKPNFA.2024.22.3.387
Biomechanical Comparison of Lower Extremities between Drop Landing and Landing after Jumping
Jong-Sung Chang, Ph.D.1⋅Seung-Min Nam, Ph.D.2†
1Department of Physical Therapy, Yeungnam University College,
2Department of Sports Rehabilitation, Yeungnam University College
Correspondence to: †Seung-Min Nam (namsm@ync.ac.kr)
Received: October 18, 2024; Revised: October 29, 2024; Accepted: October 30, 2024; Published online: December 31, 2024.
© Korea Proprioceptive Neuromuscular Facilitation Association. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: The purpose of this study was to conduct biomechanical comparisons of lower extremities during drop landing and landing after jumping to identify risk factors for potential injury associated with different landing methods.
Methods: Sixteen healthy adults in their 20s (8 males and 8 females) participated in this study. The participants performed drop landings from a height of 20 cm and landed after jumping to a height of 20 cm in randomized order. A motion analysis system and force plates were used to measure joint angles and ground reaction forces during both landing methods, and muscle activity was measured using electromyography.
Results: Analysis of the biomechanical differences between lower extremities following drop landing and landing after jumping showed that muscle activation in the vastus lateralis, biceps femoris, and tibialis anterior was significantly higher for landing after jumping than for drop landing (p < .05). In contrast, hip, knee, and ankle flexion angles were greater and the maximum vertical ground reaction force was also higher for drop landing (p < .05).
Conclusion: Differences in muscle activation, joint angles, and ground reaction forces corresponded with the landing method and can thus be used to assess injury risk. Landing after jumping absorbs impact through higher muscle recruitment, while drop landing disperses impact through greater joint movement. Therefore, proper body control strategies should be adopted in various landing situations to prevent injury.
Keywords: Biomechanics, Drop landing, Landing after jumping, Postural control

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