背景與目的：落地錯誤評分系統(Landing error scoring system, LESS)是用來評估跳躍落地動作優劣，LESS研究較少比較性別差異，本研究目的以量化方式使用LESS分析不同性別運動員下肢二維關節角度。方法：共54 位運動員參與（男性及女性各27位），以 2 台家用攝影機從受試者之目標落地範圍冠狀面及矢狀面進行拍攝，以LESS方式進行跳躍落地，錄影後由研究者觀看及人工評分，並以KINOVEA軟體測量冠狀面與矢狀面觸地瞬間及下蹲至最低點時各關節角度和位移距離、整體位移量、及髖、膝、踝位移角度。以獨立樣本t檢定比較男性與女性運動員之差異。結果：在冠狀面觸地瞬間，男性兩側腳掌朝外角度均大於女性(p < .05)。在下蹲到最低點時，男性兩側膝關節膝內翻顯著大於女性，且兩側腳掌腳掌朝外角度均大於女性(p < .05 )。矢狀面參數均無顯著差異(p > .05)。整體位移量以男性運動員較女性運動員多(p < .05)，且在踝關節位移量男性大於女性(p =.04)； LESS人工評分分數不同性別間無差異(p > .05)。結論：使用量化、二維關節角度測量，以LESS檢測健康男性與女性運動員，在跳躍落地觸地瞬間及下蹲到最低點時，男性較女性雙腳腳掌朝外、整體位移量較女性多，且踝關節位移量大於女性，表示健康男性運動員在整體落地緩衝是以踝關節做為緩衝落地的策略方式。

Background and Purpose. The Landing Error Scoring System (LESS) is a recognized tool for evaluating the quality of jump-landing movements. Its application in gender-specific biomechanical analysis remains relatively sparse in the literature. This study aimed to quantitatively assess the two-dimensional lower limb range of motion using LESS in male and female athletes. Methods. Fifty-four athletes (27 males, 27 females) performed jump-landing while filmed from the frontal and sagittal plane of the participants with two home cameras. One researcher manually scored videos using LESS criteria and employed KINOVEA software for quantitively measurement of range of motion, displacement distances, overall displacement, joint displacement on hip, knee, and ankle at initial contact and maximal knee flexion. The independent samples t test was used to analyze the gender differences. Results. In the frontal plane at initial contact, males exhibited significantly larger external rotation in both feet positions compared to females (p < .05). No significant differences were observed in sagittal plane parameters (p > .05). At maximal knee flexion, males demonstrated significantly greater knee varus angles bilaterally compared to females (p < .05). Males also displayed larger external rotation of both feet positions than females (p < .05). Male athletes had significantly greater overall displacement than females (p < .05). Ankle joint displacement was notably greater in males compared to females (p = .04). There were no significant differences in LESS manual scoring scores between genders (p > .05). Conclusion. This study utilized quantitative, two-dimensional joint angle measurements through LESS to discern gender-specific biomechanical differences in healthy athletes during jump-landings. Males exhibited greater external rotation of the feet and overall displacement, indicating potentially distinct landing strategies compared to females.

性別;跳躍;膝關節傷害;腳踝傷害;動作評估

Gender;Jumping; Knee injury;Ankle injury;Movement assessment