Horizontal and Multidirectional Single-Leg Hop Tests Predict Isokinetic Quadriceps and Hamstring Strengths After Anterior Cruciate Ligament Reconstruction
Ayşe Birsu Topcugil Kırık, Enes Akdemir, Emre Karaduman, Nizamettin Güzel, Ahmet Serhat Genç, Berna Anıl, Esra Korkmaz Salkılıç, Lokman Kehribar, Yılmaz Önder, Ali Kerim YılmazBackground:
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.
Hypothesis:
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.
Study Design:
Cross-sectional study.
Level of Evidence:
Level 3.
Methods:
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
Results:
Isokinetic strength and single-leg hop (SH), crossover hop, and medial side triple-hop (TH) distances did not differ significantly between limbs (
Conclusion:
The findings show that SH and TH tests were highly predictive of isokinetic knee strength after ACLR.
Clinical Relevance:
SLHTs after ACLR can be used as a practical and accessible complement to isokinetic measurements.