alexa Knee Objective Stability and Isokinetic Thigh Muscle Strength after Anterior Cruciate Ligament Reconstruction: A Randomized Six-Month Follow-Up Study
ISSN: 2161-0673

Journal of Sports Medicine & Doping Studies
Open Access

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Research Article

Knee Objective Stability and Isokinetic Thigh Muscle Strength after Anterior Cruciate Ligament Reconstruction: A Randomized Six-Month Follow-Up Study

Matjaz Sajovic1* and Simona Pavlic Zaloznik2

1Orthopaedics and Sports Trauma Surgery Department, General Teaching Hospital Celje, Slovenia

2UNIOR d.d. Unitur Spa and Rehabilitation Center Zrece, Cesta na Roglo 15, 3214 Zrece, Slovenia

*Corresponding Author:
Matjaz Sajovic
Senior Orthopedic Surgeon, Deputy Head
Orthopaedics and Sports Trauma Surgery Department
General Teaching Hospital Celje
Oblakova 5, 3000 Celje, Slovenia
Tel: 0038637140343
E-mail: [email protected]

Received Date: June 24, 2014; Accepted Date: September 04, 2014; Published Date: September 16, 2014

Citation: Sajovic M, Zaloznik SP(2014) Knee Objective Stability and Isokinetic Thigh Muscle Strength after Anterior Cruciate Ligament Reconstruction: A Randomized Six-Month Follow-Up Study. J Sports Med Doping Stud 4:147. doi: 10.4172/2161-0673.1000147

Copyright: © 2014 Sajovic M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



Purpose: The most frequently used grafts for intra-articular anterior cruciate ligament (ACL) reconstruction are the autologous patellar tendon (PT) or doubled semitendinosus and gracilis tendons (STG) autografts. There are still controversies about graft selection for primary ACL reconstruction.

Methods: A prospective, randomized study was conducted on 57 patients who underwent arthroscopically assisted ACL reconstruction between January 2010 and February 2011. In 29 patients ACL reconstruction was performed with hamstring tendon autograft (STG group), and in 28 patients the ACL reconstruction was performed with patellar tendon autograft (PT group). At 6 months follow-up, all patients have performed the isokinetic extensor and flexor muscles strength and KT-1000 measurements.

Results: At 6 months after surgery, we found significantly lower average isokinetic quadriceps peak torque in the PT group compared to the STG group at angular velocity of 60°/s. However, at the same time we did not find significant difference in flexor muscle power comparing both groups. The manual maximum KT-1000 arthrometer side-to-side difference was 1.7 ± 1.7 mm for the PT group and 1.9 ± 1.6 mm for the STG group (P=0.398). No significant correlation was found between the knee objective stability (KT-1000 measurements) and the isokinetic thigh muscle strength (extensors, Spearman’s rho=0.057, P=0.671; flexors, Spearman’s rho=0.094, P=0.489).

Conclusions: Both hamstring and patellar tendon autografts provided good objective stability at 6 months after surgery In addition, regardless of which graft was used, a considerable percentage of patients continue to have strength deficits. In our opinion, the ACL-reconstructed leg should have 85% or greater return to the strength of the normal leg as one criterion before release to full sports activities. We were particularly intrigued to find only half of the competitive athletes achieved this goal at 6 months after surgery.


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