Abstract
Purpose
Patients typically return to sports activities 6–12 months after anterior cruciate ligament (ACL) reconstruction, and quadriceps strength has been used as one of the criteria to return to sports activities. The purpose of this study is to identify the factors that affect quadriceps strength recovery after ACL reconstruction with a hamstring tendon autograft 6 months after surgery.
Methods
Isokinetic quadriceps strength at 60°/s was measured preoperatively and 6 months after surgery in 193 athletes who underwent ACL reconstruction with a hamstring tendon autograft. The quadriceps strength index was calculated by normalizing the peak torque of the involved leg with the uninvolved leg. The subjects were divided into two groups according to the quadriceps strength index 6 months after surgery: at least 85 % (n = 84) or less than 85 % (n = 109). Multivariate logistic regression analysis and a receiver operating curve analysis were performed.
Results
The preoperative quadriceps strength index [odds ratio (OR) 1.02; 95 % confidence interval (CI) 1.01–1.03], age (OR 0.92; 95 % CI 0.86–0.98), sex (OR 2.45; 95 % CI 1.19–5.18), and knee pain (OR 0.17; 95 % CI 0.04–0.52) were independently associated with quadriceps strength recovery. The cut-off value of the preoperative quadriceps strength index was 70.2 % to obtain at least 85 % quadriceps strength index 6 months after surgery.
Conclusion
To achieve sufficient quadriceps strength recovery at the timing of return to sports activities following ACL reconstruction using a hamstring tendon autograft, preoperative quadriceps strength, age, sex, and knee pain should be considered.
Level of evidence
III.
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Abbreviations
- ACL:
-
Anterior cruciate ligament
- ROC:
-
Receiver operating curve
- OR:
-
Odds ratio
- CI:
-
Confidence interval
- BPTB:
-
Bone–patellar-tendon–bone
- SB:
-
Single-bundle
- DB:
-
Double-bundle
- AMB:
-
Anteromedial bundle
- PMB:
-
Posterolateral bundle
- GR group:
-
Good quadriceps strength recovery group
- PR group:
-
Poor quadriceps strength recovery group
- AUC:
-
Area under the curve
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Acknowledgments
We thank the staff of Kobe University Hospital for supporting the authors.
Authors’ contribution
Y. U was involved in the conception and design of the study, the acquisition, analysis and interpretation of the data, and writing the article. T. Matsushita was involved in the conception and design of the study, development of the research, and writing the article. D. A, Y. Shibata, and R. O were involved in the conception and design of the study. A. K, K. Takiguchi, Y. Shibata, and K. O were involved in the acquisition of the data. All of the authors were involved in the critical revisions of the article for its important intellectual content, and they all approved the final version of the article.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required
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Ueda, Y., Matsushita, T., Araki, D. et al. Factors affecting quadriceps strength recovery after anterior cruciate ligament reconstruction with hamstring autografts in athletes. Knee Surg Sports Traumatol Arthrosc 25, 3213–3219 (2017). https://doi.org/10.1007/s00167-016-4296-6
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DOI: https://doi.org/10.1007/s00167-016-4296-6