Rachis lombaire dégénératif Imagerie

Elastography Study of Hamstring Behaviors during Passive Stretching

“…The present study was designed to assess hamstrings response during passive stretching by measuring shear modulus using SSI elastography. Based on reliable ultrasonic key locations of the muscles (see Fig 2 ) [ 12 , 25 ] we investigated the whole group during PKE performed in three different positions.…”

“…First, hamstrings are more difficult to analyze using ultrasound, due to a complex organization ( e . g ., intra-muscular fibrous composition) [ 12 , 25 ] compared to clearly structured muscles such as gastrocnemius , quadriceps , biceps brachii , and tibialis anterior muscles. Secondly and linked with the previous point, we performed hand-held measurements that may increase the variation of measurement, compared to a cast-positioned transducer on the muscle belly.…”

“…Based on several pilots and ultrasound of key hamstrings locations, we determined reproducible locations ( Fig 2 ) for maintaining a shear wave map in the targeted muscle during movement. [ 12 , 25 ] Briefly, we scanned ST proximally before the tendinous inscription dividing this muscle into 2 parts. [ 25 ] For SM and BF-lh , the probe was placed after the musculotendinous junction, close to mid-thigh were the muscle belly was sufficiently developed.…”

“…[ 12 , 25 ] Briefly, we scanned ST proximally before the tendinous inscription dividing this muscle into 2 parts. [ 25 ] For SM and BF-lh , the probe was placed after the musculotendinous junction, close to mid-thigh were the muscle belly was sufficiently developed. Finally BF-sh was explored distally deeper than BF-lh .…”

“…[ 23 ] To our knowledge, only one study has measured the fascicle length of one hamstring muscle (semimembranosus) during passive stretching. [ 24 ] Therefore, while strong anatomical differences between muscles suggest that they are likely to behave differently,[ 12 , 25 ] the mechanical properties of each hamstring muscle has not yet been reported in vivo .…”