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| 00:00:04-00:00:06 | There are four major ligaments that stabilize the
knee. |
| 00:00:10-00:00:13 | The Medial Collateral Ligament is on the inner
side of the knee. |
| 00:00:14-00:00:17 | And the Lateral Collateral Ligament,
on the outer side. |
| 00:00:20-00:00:23 | The Collateral Ligaments give sideway stability
to the knee. |
| 00:00:29-00:00:34 | Two ligaments cross in the center of the knee.
They are called the Cruciate Ligaments. |
| 00:00:38-00:00:42 | The ligament toward the front is the Anterior
Cruciate Ligament, or ACL. |
| 00:00:43-00:00:46 | And the one towards the back, is the
Posterior Cruciate Ligament. |
| 00:00:55-00:00:58 | The ACL prevents the lower bone, the tibia,
from moving forward. |
| 00:00:59-00:01:01 | And the PCL prevents it from moving
backward. |
| 00:01:09-00:01:12 | If the ACL tears, the tibia can move forward
too much. |
| 00:01:14-00:01:15 | And the knee can be unstable.
|
| 00:01:18-00:01:23 | The knee in which the ACL is torn, tends to give
out when pivoting, or quickly changing direction. |
| 00:01:26-00:01:29 | To correct this instability a new ACL can be made.
|
| 00:01:31-00:01:34 | The strongest graft that is available to replace
the torn ACL, |
| 00:01:35-00:01:41 | is the middle third of the Patellar Tendon. This
graft has a plug of bone taken from the Patellar, |
| 00:01:42-00:01:45 | or knee cap on one end, and from the tibia
on the other end. |
| 00:01:47-00:01:51 | These plugs of bone are important. Because
they provide solid fixation of the graft. |
| 00:01:57-00:02:00 | This animation will explain ho the middle
third of the Patellar Tendon, |
| 00:02:01-00:02:04 | is used to reconstruct a torn Interior
Cruciate Ligament. |
