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This Article Full Text Full Text (PDF) All Versions of this Article: 33/10/1527    most recent 0363546505274934v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Request Reprints Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (5) Citing Articles via Google Scholar Google Scholar Articles by Ageberg, E. Articles by Fridén, T. Search for Related Content PubMed PubMed Citation Articles by Ageberg, E. Articles by Fridén, T. Related Collections Injury Knee Biomechanics

Balance in Single-Limb Stance in Patients With Anterior Cruciate Ligament Injury

Relation to Knee Laxity, Proprioception, Muscle Strength, and Subjective Function

Eva Ageberg, RPT, PhD^*,,, David Roberts, MD, PhD, Eva Holmström, RPT, PhD and Thomas Fridén, MD, PhD

From the Departments of Rehabilitation and Orthopedics, Lund University Hospital, Lund, Sweden, and the Department of Physical Therapy, Lund University, Lund, Sweden

^* Address correspondence to Eva Ageberg, RPT, PhD, Department of Physical Therapy, Lund University, Lasarettsgatan 7, SE-221 85 Lund, Sweden (e-mail: eva.ageberg{at}sjukgym.lu.se).

Background: It has been shown previously that an anterior cruciate ligament injury may affect postural control, measured by balance in single-limb stance. To our knowledge, no studies have reported the influence of measures of impairment on postural control after such an injury.

Purpose: To assess the influence of knee laxity, proprioception, and muscle strength on balance in single-limb stance and to study the correlation between balance in single-limb stance and subjective estimation of extremity function.

Study Design: Cross-sectional study; Level of evidence, 3.

Methods: A total of 36 patients with a unilateral, nonoperated, nonacute anterior cruciate ligament injury were examined with regard to anterior knee laxity, proprioception, muscle strength, and stabilometry (amplitude and average speed of the center of pressure movements). Subjective estimation of extremity function was measured on a visual analog scale.

Results: The multiple regression analysis showed that high knee laxity values were associated with high amplitude values and low average speed. Poor proprioception and high muscle strength values were associated with low average speed among the women only. Low amplitude values correlated with better subjective function.

Conclusion: Anterior knee laxity, proprioception, and muscle strength seem to play a role in maintaining balance in single-limb stance. Patients with low amplitude values in stabilometry were those with better subjective function.

Key Words: knee joint • anterior cruciate ligament (ACL) • postural control • proprioception • joint instability • isokinetic strength • patient satisfaction

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