Christin M Zwolski, Grant R Poston, Laine A Anthony, Kristin L Bastian, Megan M Sayre, Kathleen M Hugentobler, Alyson R Filipa
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The hypotheses were that 1) males would demonstrate higher normalized strength, and that 2) a higher proportion of males would achieve ≥90% limb symmetry when compared to females.</p><p><strong>Study design: </strong>Cross-sectional.</p><p><strong>Methods: </strong>At 6.9±2.1 months after MPFLR, 162 patients completed isokinetic assessment of knee extension (KE) and flexion (KF) strength at 180°/s and 300°/s on both limbs (uninvolved [UN], involved [INV]). Strength data and patient-reported outcome scores, including the International Knee Documentation Committee (IKDC) Subjective Knee Form and Pediatric Quality of Life Inventory (PedsQL) were extracted from electronic medical records. Descriptive statistics were used to categorize data by age (Pre-adolescent, Early Adolescent, Late Adolescent, Young Adult) and sex. Independent-samples t-tests and chi-square analyses were used to determine sex-based differences in strength. Multiple linear regression analyses were used to determine the relationship between strength and patient-reported function.</p><p><strong>Results: </strong>Among Early Adolescents, males demonstrated higher normalized KE strength at 300°/s compared to females (UN: 1.27±0.3 vs. 1.07±0.3 [p=0.01]; INV: 1.07±0.2 vs. 0.92±0.3 [p=0.03]). Among Late Adolescents, males demonstrated higher INV limb strength for KE 180°/s (1.55±0.53 vs. 1.24±0.5; p=0.02), KE 300°/s (1.25±0.4 vs. 1.00±0.4; p=0.01), and KF 180°/s (0.98±0.4 vs. 0.82±0.3; p=0.05). A higher proportion of Late Adolescent and Young Adult males achieved ≥90% LSI compared to females (p=<0.01-0.04). Regression models estimating IKDC and PedsQL scores were significant with INV KE strength as an independent variable (p=0.01-0.03).</p><p><strong>Conclusions: </strong>Males demonstrated higher normalized strength and symmetry compared to females following MPFLR. Higher INV KE strength was associated with higher patient-reported function.</p><p><strong>Level of evidence: </strong>2b.</p>","PeriodicalId":47892,"journal":{"name":"International Journal of Sports Physical Therapy","volume":"20 3","pages":"333-343"},"PeriodicalIF":1.6000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11872563/pdf/","citationCount":"0","resultStr":"{\"title\":\"Isokinetic Strength Profiles Among Youth after Medial Patellofemoral Ligament Reconstruction.\",\"authors\":\"Christin M Zwolski, Grant R Poston, Laine A Anthony, Kristin L Bastian, Megan M Sayre, Kathleen M Hugentobler, Alyson R Filipa\",\"doi\":\"10.26603/001c.129257\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>Knee strength is a critical measure of successful rehabilitation following medial patellofemoral ligament reconstruction (MPFLR). Yet, strength outcomes of youth following MPFLR are not widely reported.</p><p><strong>Hypothesis/purpose: </strong>The primary purpose was to profile isokinetic strength outcomes by sex and age among youth following MPFLR. A secondary purpose was to determine the relationship between normalized isokinetic strength values and patient-reported outcome scores by age and sex. The hypotheses were that 1) males would demonstrate higher normalized strength, and that 2) a higher proportion of males would achieve ≥90% limb symmetry when compared to females.</p><p><strong>Study design: </strong>Cross-sectional.</p><p><strong>Methods: </strong>At 6.9±2.1 months after MPFLR, 162 patients completed isokinetic assessment of knee extension (KE) and flexion (KF) strength at 180°/s and 300°/s on both limbs (uninvolved [UN], involved [INV]). Strength data and patient-reported outcome scores, including the International Knee Documentation Committee (IKDC) Subjective Knee Form and Pediatric Quality of Life Inventory (PedsQL) were extracted from electronic medical records. Descriptive statistics were used to categorize data by age (Pre-adolescent, Early Adolescent, Late Adolescent, Young Adult) and sex. Independent-samples t-tests and chi-square analyses were used to determine sex-based differences in strength. Multiple linear regression analyses were used to determine the relationship between strength and patient-reported function.</p><p><strong>Results: </strong>Among Early Adolescents, males demonstrated higher normalized KE strength at 300°/s compared to females (UN: 1.27±0.3 vs. 1.07±0.3 [p=0.01]; INV: 1.07±0.2 vs. 0.92±0.3 [p=0.03]). Among Late Adolescents, males demonstrated higher INV limb strength for KE 180°/s (1.55±0.53 vs. 1.24±0.5; p=0.02), KE 300°/s (1.25±0.4 vs. 1.00±0.4; p=0.01), and KF 180°/s (0.98±0.4 vs. 0.82±0.3; p=0.05). A higher proportion of Late Adolescent and Young Adult males achieved ≥90% LSI compared to females (p=<0.01-0.04). Regression models estimating IKDC and PedsQL scores were significant with INV KE strength as an independent variable (p=0.01-0.03).</p><p><strong>Conclusions: </strong>Males demonstrated higher normalized strength and symmetry compared to females following MPFLR. Higher INV KE strength was associated with higher patient-reported function.</p><p><strong>Level of evidence: </strong>2b.</p>\",\"PeriodicalId\":47892,\"journal\":{\"name\":\"International Journal of Sports Physical Therapy\",\"volume\":\"20 3\",\"pages\":\"333-343\"},\"PeriodicalIF\":1.6000,\"publicationDate\":\"2025-03-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11872563/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Sports Physical Therapy\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.26603/001c.129257\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/1/1 0:00:00\",\"PubModel\":\"eCollection\",\"JCR\":\"Q3\",\"JCRName\":\"SPORT SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Sports Physical Therapy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.26603/001c.129257","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/1 0:00:00","PubModel":"eCollection","JCR":"Q3","JCRName":"SPORT SCIENCES","Score":null,"Total":0}
引用次数: 0
摘要
背景：膝关节力量是髌股内侧韧带重建（MPFLR）后成功康复的关键指标。然而，青少年MPFLR后的力量结果并没有被广泛报道。假设/目的：主要目的是分析MPFLR后青年中按性别和年龄划分的等速力量结果。第二个目的是确定标准化等速力量值与患者报告的年龄和性别结果评分之间的关系。假设1)男性具有更高的标准化强度，2)与女性相比，更高比例的男性具有≥90%的肢体对称性。研究设计：横断面。方法：在MPFLR后6.9±2.1个月，162例患者完成了180°/s和300°/s双肢（未受累[UN]，受累[INV]）膝关节伸展（KE）和屈曲（KF）强度的等速评估。从电子病历中提取力量数据和患者报告的结果评分，包括国际膝关节文献委员会（IKDC）主观膝关节表和儿科生活质量量表（PedsQL）。使用描述性统计按年龄（青春期前、青春期早期、青春期晚期、青年）和性别对数据进行分类。使用独立样本t检验和卡方分析来确定基于性别的强度差异。采用多元线性回归分析确定强度与患者报告功能之间的关系。结果：在青少年早期，男性在300°/s时的标准化KE强度高于女性(UN: 1.27±0.3比1.07±0.3 [p=0.01]；INV: 1.07±0.2 vs. 0.92±0.3 [p=0.03])。在青少年晚期，男性在KE 180°/s时表现出更高的INV肢体力量（1.55±0.53比1.24±0.5）；p=0.02), KE 300°/s(1.25±0.4 vs. 1.00±0.4；p=0.01), KF 180°/s(0.98±0.4∶0.82±0.3；p = 0.05)。与女性相比，青少年晚期和年轻成年男性达到≥90% LSI的比例更高(p=结论：在MPFLR后，男性比女性表现出更高的标准化力量和对称性。较高的INV KE强度与较高的患者报告功能相关。证据等级：2b。
Isokinetic Strength Profiles Among Youth after Medial Patellofemoral Ligament Reconstruction.
Background: Knee strength is a critical measure of successful rehabilitation following medial patellofemoral ligament reconstruction (MPFLR). Yet, strength outcomes of youth following MPFLR are not widely reported.
Hypothesis/purpose: The primary purpose was to profile isokinetic strength outcomes by sex and age among youth following MPFLR. A secondary purpose was to determine the relationship between normalized isokinetic strength values and patient-reported outcome scores by age and sex. The hypotheses were that 1) males would demonstrate higher normalized strength, and that 2) a higher proportion of males would achieve ≥90% limb symmetry when compared to females.
Study design: Cross-sectional.
Methods: At 6.9±2.1 months after MPFLR, 162 patients completed isokinetic assessment of knee extension (KE) and flexion (KF) strength at 180°/s and 300°/s on both limbs (uninvolved [UN], involved [INV]). Strength data and patient-reported outcome scores, including the International Knee Documentation Committee (IKDC) Subjective Knee Form and Pediatric Quality of Life Inventory (PedsQL) were extracted from electronic medical records. Descriptive statistics were used to categorize data by age (Pre-adolescent, Early Adolescent, Late Adolescent, Young Adult) and sex. Independent-samples t-tests and chi-square analyses were used to determine sex-based differences in strength. Multiple linear regression analyses were used to determine the relationship between strength and patient-reported function.
Results: Among Early Adolescents, males demonstrated higher normalized KE strength at 300°/s compared to females (UN: 1.27±0.3 vs. 1.07±0.3 [p=0.01]; INV: 1.07±0.2 vs. 0.92±0.3 [p=0.03]). Among Late Adolescents, males demonstrated higher INV limb strength for KE 180°/s (1.55±0.53 vs. 1.24±0.5; p=0.02), KE 300°/s (1.25±0.4 vs. 1.00±0.4; p=0.01), and KF 180°/s (0.98±0.4 vs. 0.82±0.3; p=0.05). A higher proportion of Late Adolescent and Young Adult males achieved ≥90% LSI compared to females (p=<0.01-0.04). Regression models estimating IKDC and PedsQL scores were significant with INV KE strength as an independent variable (p=0.01-0.03).
Conclusions: Males demonstrated higher normalized strength and symmetry compared to females following MPFLR. Higher INV KE strength was associated with higher patient-reported function.
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