Endurance sports after total knee replacement: a biomechanical investigation
Markus Kuster, E Spalinger, B A Blanksby & A Gächter
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abstract
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PURPOSE: No biomechanical evaluation of total knee designs exists
for loads occurring during sports activities. It was the purpose of
the present study to evaluate the contact stress distribution and
contact area of different knee joint designs for loads that occur
during four common recreational endurance activities. METHODS: Three
different total knee designs were evaluated for loads occurring
during cycling (1.2 body weight (BW) at 80 degrees of knee flexion),
power walking (4 BW at 20 degrees), hiking (8 BW at 40 degrees), and
jogging (9 BW at 50 degrees) using Fuji pressure-sensitive film. The
designs consisted of a flat tibial inlay, a curved inlay, and an
inlay with mobile bearings. Five measurements were conducted for
each load. The pressure sensitive films were scanned and analyzed
using an image analysis program. RESULTS: During cycling, the area
with stress levels above the yield point of polyethylene (overloaded
area) was below 15 mm2 for each design. During power walking, the
mobile bearing design showed no overloaded area, whereas it was
below 50 mm2 for the flat and curved design. During downhill walking
and jogging, more than 140 mm2 were overloaded for each design.
CONCLUSIONS: It was concluded that patients after total knee
replacement should alternate activities such as power walking and
cycling. For mountain hiking, patients are advised to avoid descents
or at least use ski poles. Jogging or sports involving running
should be discouraged after total knee replacement.
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citation
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kuster m, Spalinger E, Blanksby B A, Gächter A. Endurance sports
after total knee replacement: a biomechanical investigation.
Medicine and science in sports and exercise 2000; 32:721-4.
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type
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journal paper/review (English)
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date of publishing
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4-2000
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journal title
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Medicine and science in sports and exercise (32/4)
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ISSN print
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0195-9131
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pages
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721-4
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PubMed
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10776888
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