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· DOS Abstracts
Effect of autograft type on muscle strength
symmetry of the knee extensors and flexors
in patients with anterior cruciate ligament
reconstruction – Preliminary data.
Kasper Staghøj Sinding, Torsten Grønbech Nielsen, Ulrik Dalgas, Martin Lind
Department of Orthopaedic Surgery, Aarhus University Hospital; Department of
Orthopaedic Surgery, Aarhus University Hospital; Department of Public Health,
Section of Sport Science, Aarhus University; Department of Orthopaedic
Surgery, Aarhus University Hospital
Background:
Muscle strength asymmetry of the knee extensors (KE) and flex-
ors (KF) is seen after anterior cruciate ligament (ACL) reconstruction, which
may affect physical performance and risk of re-injury. The effect of different
autografts (i.e. quadriceps-autograft (QTB) vs. semitendinosus-gracilis auto-
graft (StG)) on thigh muscle strength symmetry is unclear.
Purpose / Aim of Study:
To compare muscle strength symmetry of the KE and
KF in patients following ACL reconstruction with either QTB or StG.
Materials and Methods:
49 ACL patients were included and randomized to
either StG (n=20) or QTB (n=29) reconstruction. Muscle strength testing was
performed one year postoperative to determine maximum voluntary contrac-
tion of the KE and KF of both legs using isokinetic dynamometry. Isometric test-
ing was performed at knee angels of 70 and 20 degrees knee flexion for KE
and KF, respectively. Isokinetic testing was done at 60 and 180 degrees/s for
concentric contractions, and 60 degrees/s for eccentric contractions. Deficits
are expressed as limb symmetry index (LSI; operated leg/contralateral leg).
Findings / Results:
Both StG- and QTB showed significant (p<0.05) strength
deficits in KE (LSI 0.82-0.93 and LSI 0.71-0,84, respectively). For StG a sig-
nificant deficit was seen for KF (LSI 0,83-0,87), while QTB only had strength
deficits for eccentric KF (LSI 0.92). A group comparison showed that QTB had
significantly lower LSI for all KE outcomes except eccentric KE, while StG had
significantly lower LSI for concentric KF.
Conclusions:
The StG-group showed muscle strength deficits in both KE and
KF, whereas the QTB-group showed deficits in all KE but a deficit only in the ec-
centric muscle strength of the KF. Comparing LSI between grafttypes QTB had
overall lower KE LSI and higher KF LSI than StG.
No conflicts of interest reported
103.