Biomechanic Of Spine Heri Sutanto
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Biomechanic Of Spine
Heri Sutanto
Martopelo
Center
Biomechanics of the Spine & Hip• Movements of Spine• Flexion, Rotation, Extension, Abd, Add.
• Hip Movements• Elevation, Anterior & Posterior Tilt, Flexion, Extension,
Abd, Add, Hyperext, Hyperflex
Martopelo
Center
Spinal Deviations
Martopelo
Center
Martopelo
Center
Forces Acting On The Spine
• Forces Acting On The Spine Include:– Body Weight– Tension In The Spinal Ligaments– Tension In The Surrounding Muscles– Intraabdominal Pressure
• The Major Form Of Loading On The Spine Is:– Axial
Martopelo
Center
Upright Position
• Spinal Compression– Resulting From:
– Body Weight + Weight Held by Arms and Hands
• When Standing Upright– Total Body Center of Gravity
Is Anterior to the Spinal Column.
– Spine Is Placed Under Constant Forward Bending Moment.
Martopelo
Center
Loads on the Spine
Because the spine is curved, body weight, acting vertically, has components of both compression (Fc) and shear (Fs) at most motion segments.
Fc
Fs
wt
Martopelo
Center
Loads on the Spine
During lifting, both compression and anterior shear act on the spine. Tension in the spinal ligaments and muscles contributes to compression.
Muscle tension
Shear reaction force
Compression reaction force
Joint center
Martopelo
Center
Sample Problem 1
How much tension must be developed by the erector spinae with a moment arm of 6cm from L5-S1 joint center to maintain the body in the position shows on your right?
Given that
Head : 58 N Arms : 81 N
Trunk : 328 N Box : 111 N
Martopelo
Center
Loads on the Spine
Lumbar hyperextension can create a bending load (moment) in the posterior direction.
compression tension
Martopelo
Center
Loads on the Spine
hyperextension
Lumbar hyperextension produces compressive loads at the facet joints.
Martopelo
Center
Loads on the Spine
Spinal rotation generates shear stress in the intervertebral discs.
Superior view Lateral view
Martopelo
Center
Martopelo
Center
Human Posture When Lifting
Martopelo
Center
Common Injuries
Low back painSoft tissue InjuriesAcute fracturesStress Fracture – spondylolysis (fracture
in vertebral neural arch)Disc herniation
Martopelo
CenterThanks....
Martopelo
Center
• Fungsi facet joint?
• Knp hyperex bs terjadi?
Related Documents
