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Calf Muscle Performance Deficits Remain 7 Years After an Achilles Tendon Rupture

Artikel i vetenskaplig tidskrift
Författare Annelie Brorsson
Karin Grävare Silbernagel
Nicklas Olsson
Katarina Nilsson-Helander
Publicerad i American Journal of Sports Medicine
Volym 46
Nummer/häfte 2
Sidor 470-477
ISSN 0363-5465
Publiceringsår 2018
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för ortopedi
Sidor 470-477
Språk en
Länkar https://doi.org/10.1177/03635465177...
Ämnesord Achilles tendon rupture, heel-rise test, long-term follow-up, calf muscle performance, randomized-trial, repair, return, rehabilitation, elongation, endurance, strength, sports, play, Orthopedics, Sport Sciences
Ämneskategorier Idrottsvetenskap, Ortopedi

Sammanfattning

Background: Optimizing calf muscle performance seems to play an important role in minimizing impairments and symptoms after an Achilles tendon rupture (ATR). The literature lacks long-term follow-up studies after ATR that describe calf muscle performance over time. Purpose: The primary aim was to evaluate calf muscle performance and patient-reported outcomes at a mean of 7 years after ATR in patients included in a prospective, randomized controlled trial. A secondary aim was to evaluate whether improvement in calf muscle performance continued after the 2-year follow-up. Methods: Sixty-six subjects (13 women, 53 men) with a mean age of 50 years (SD, 8.5 years) were evaluated at a mean of 7 years (SD, 1 year) years after their ATR. Thirty-four subjects had surgical treatment and 32 had nonsurgical treatment. Patient-reported outcomes were evaluated with Achilles tendon Total Rupture Score (ATRS) and Physical Activity Scale (PAS). Calf muscle performance was evaluated with single-leg standing heel-rise test, concentric strength power heel-rise test, and single-legged hop for distance. Limb Symmetry Index (LSI = injured side/healthy side x 100) was calculated for side-to-side differences. Results: Seven years after ATR, the injured side showed decreased values in all calf muscle performance tests (P < .001-.012). Significant improvement in calf muscle performance did not continue after the 2-year follow-up. Heel-rise height increased significantly (P = .002) between the 1-year (10.8 cm) and the 7-year (11.5 cm) follow-up assessments. The median ATRS was 96 (of a possible score of 100) and the median PAS was 4 (of a possible score of 6), indicating minor patient-reported symptoms and fairly high physical activity. No significant differences were found in calf muscle performance or patient-reported outcomes between the treatment groups except for the LSI for heel-rise repetitions. Conclusion: Continued deficits in calf muscle endurance and strength remained 7 years after ATR. No continued improvement in calf muscle performance occurred after the 2-year follow-up except for heel-rise height.

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