Variability in leg muscle power and hop performance after anterior cruciate ligament reconstruction.

• PURPOSE: The purpose of this prospective study was to describe the variability in leg muscle power and hop performance up to 2years among patients following ACL reconstruction and specifically to illustrate the effects of various criteria for an acceptable level of muscle function. METHODS: Eighty-two patients (56 men and 26 women) with a mean age of 28years, who underwent ACL reconstruction using either hamstring tendons (n=46) or a patellar tendon (n=36), were assessed pre-operatively and 3, 6, 12 and 24months post-surgery with a battery of three lower extremity muscle power tests and a battery of three hop tests. RESULTS: Leg symmetry index (LSI) values at group level ranged between 73 and 100% at all follow-ups. When the tests were evaluated individually, patients reached an average LSI of ≥90% at 24months. The success rate at 24months for the muscle power test battery, that is, patients with an LSI of ≥90% in all three tests, was 48 and 44% for the hop test battery. The success rate at 24months for both test batteries on all six muscle function tests was 22%. The criterion of an LSI of ≥80% resulted in 53% of the patients having an acceptable level on all six tests, while with a criterion of an LSI of ≥100%, none of the patients reached an acceptable level. CONCLUSION: At group level and in single muscle function tests, the muscle function outcome 1 and 2years after ACL reconstruction is satisfactory in the present study and on a par with the results presented in the literature. However, when using more demanding criteria for a successful muscle function outcome, using batteries of tests or increasing the acceptable LSI level from ≥90% to ≥95% or ≥100%, the results are considered to be poor. It is suggested that this should be taken into consideration when presenting results after ACL rehabilitation, deciding on the criteria for a safe return to sports, or designing rehabilitation programmes after ACL reconstruction. LEVEL OF EVIDENCE: Prognostic prospective cohort study, Level I.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Kirurgi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Surgery (hsv//eng)

MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)

Nyckelord

Strength tests

Muscle function

Rehabilitation

Criteria

Return to sports

Medicin

Idrottsvetenskap

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