{
  "abstract": "Background:: After anterior cruciate ligament reconstruction (ACLR), isokinetic strength and single-leg hop tests (SLHT) are used to assess return to sport readiness. This study examined the relationships and predictive effects of isokinetic knee extension (Ex) and flexion (Flx) strength with 5 SLHTs at 6 to 8 months post-ACLR.\n\nHypothesis:: There would be significant correlation between knee Ex and Flx strengths on the operated side and 5 different SLHTs; SLHTs would significantly predict knee isokinetic Ex and Flx strength.\n\nStudy Design:: Cross-sectional study.\n\nLevel of Evidence:: Level 3.\n\nMethods:: Fifty-one male participants underwent unilateral ACLR. Lysholm, International Knee Documentation Committee (IKDC), and Tegner scales were assessed preoperatively and 6 to 8 months postoperatively. At the same follow-up, isokinetic strength at 60°/s, 180°/s, and 240°/s and 5 SLHTs were tested on both limbs. Data were analyzed with paired t tests, Pearson correlations, Fisher’s exact test, and simple linear regression; limb symmetry index (LSI) cut-off was ≥85%.\n\nResults:: Isokinetic strength and single-leg hop (SH), crossover hop, and medial side triple-hop (TH) distances did not differ significantly between limbs (P > 0.05), whereas TH and 90° medial rotation hop distances were significantly shorter on the operated side (P < 0.05). Participants’ Lysholm and IKDC scores improved significantly at 6 to 8 months post-ACLR (P < 0.001), but Tegner activity level did not change significantly (P > 0.05). High correlation was found between Ex strength at 60°/s and SH and TH distances on the operated side, and high-moderate correlations were found at 180°/s and 240°/s. Flx strengths showed a similar but slightly lower degree of correlation. Simple linear regression models revealed that especially SH and TH distances significantly predicted both Ex and Flx strengths (adjusted R2 0.26-0.52; P < 0.001). Among the LSI values, only a significant correlation was found between 60°/s Ex and TH LSI ratio (P = 0.01).\n\nConclusion:: The findings show that SH and TH tests were highly predictive of isokinetic knee strength after ACLR.\n\nClinical Relevance:: SLHTs after ACLR can be used as a practical and accessible complement to isokinetic measurements.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 10,
  "authors": [
    {
      "name": "Ayşe Birsu Topcugil Kırık",
      "orcid": "0000-0002-6296-9760"
    },
    {
      "name": "Enes Akdemir",
      "orcid": "0000-0002-1000-2881"
    },
    {
      "name": "Emre Karaduman",
      "orcid": "0000-0002-7962-315X"
    },
    {
      "name": "Nizamettin Güzel",
      "orcid": "0000-0003-4765-5285"
    },
    {
      "name": "Ahmet Serhat Genç",
      "orcid": "0000-0003-3117-2449"
    },
    {
      "name": "Berna Anıl",
      "orcid": "0000-0002-8070-0626"
    },
    {
      "name": "Esra Korkmaz Salkılıç",
      "orcid": "0000-0003-4545-210X"
    },
    {
      "name": "Lokman Kehribar",
      "orcid": "0000-0001-9799-8839"
    },
    {
      "name": "Yılmaz Önder",
      "orcid": "0009-0001-5071-0620"
    },
    {
      "name": "Ali Kerim Yılmaz",
      "orcid": "0000-0002-0046-6711"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cy5fpvzc95n54.bib",
  "cited_by": 0,
  "doi": "10.1177/19417381261486269",
  "fulltext_url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13735757/",
  "id": "cy5fpvzc95n54",
  "issns": [
    "1941-7381",
    "1941-0921"
  ],
  "landing_url": "https://doi.org/10.1177/19417381261486269",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "heading",
      "Article"
    ],
    [
      "openalex",
      "2746|Knee injuries and reconstruction techniques"
    ]
  ],
  "openalex": "W7225263682",
  "pdf_url": null,
  "pmcid": "PMC13735757",
  "pmid": "42981220",
  "published": "2026-11-04",
  "publisher": "SAGE Publications",
  "ris": "https://research.draconitic.com/paper/cy5fpvzc95n54.ris",
  "sources": [
    {
      "first_seen": "2026-11-09T12:21:23Z",
      "native_id": "PMC13735757",
      "source": "pmc",
      "url": "https://doi.org/10.1177/19417381261486269"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "openalex:2746|Knee injuries and reconstruction techniques",
      "subfield": "surgery"
    }
  ],
  "title": "Horizontal and Multidirectional Single-Leg Hop Tests Predict Isokinetic Quadriceps and Hamstring Strengths After Anterior Cruciate Ligament Reconstruction",
  "title_text": "Horizontal and Multidirectional Single-Leg Hop Tests Predict Isokinetic Quadriceps and Hamstring Strengths After Anterior Cruciate Ligament Reconstruction",
  "type": "peer-reviewed",
  "updated_at": "2026-11-09T12:21:23Z",
  "url": "https://research.draconitic.com/paper/cy5fpvzc95n54",
  "venue": "Sports Health",
  "versions": []
}