Fracture healing using degradable magnesium fixation plates and screws.

Purpose: Internal bone fixation devices made with permanent metals are associated with numerous long-term complications and may require removal. We hypothesized that fixation devices made with degradable magnesium alloys could provide an ideal combination of strength and degradation, facilitating fracture fixation and healing while eliminating the need for implant removal surgery.

Materials And Methods: Fixation plates and screws were machined from 99.

Tension patterns of the anteromedial and posterolateral grafts in a double-bundle anterior cruciate ligament reconstruction.

The two functional bundles of the anterior cruciate ligament (ACL), namely, the anteromedial (AM) and posterolateral (PL) bundles, must work in concert to control displacement of the tibia relative to the femur for complex motions. Thus, the replacement graft(s) for a torn ACL should possess similar tension patterns. The objective of the study was to examine whether a double-bundle ACL reconstruction with the semitendinosus-gracilis autografts could replicate the tension patterns of those for the intact ACL under controlled in vitro loading conditions.

Determination of a safe range of knee flexion angles for fixation of the grafts in double-bundle anterior cruciate ligament reconstruction: a human cadaveric study.

Background: For anterior cruciate ligament reconstruction with a double-bundle procedure, one of the major concerns is to not predispose either one of the grafts to risk of failure by overloading.

Hypothesis: Knee flexion angles between 15 degrees and 45 degrees for anteromedial graft fixation and 15 degrees for posterolateral graft fixation are safe for both grafts in double-bundle anterior cruciate ligament reconstruction.

Study Design: Controlled laboratory study.

Biomechanics and anterior cruciate ligament reconstruction.

For years, bioengineers and orthopaedic surgeons have applied the principles of mechanics to gain valuable information about the complex function of the anterior cruciate ligament (ACL). The results of these investigations have provided scientific data for surgeons to improve methods of ACL reconstruction and postoperative rehabilitation. This review paper will present specific examples of how the field of biomechanics has impacted the evolution of ACL research.

Effects of knee flexion angles for graft fixation on force distribution in double-bundle anterior cruciate ligament grafts.

Background: In double-bundle anterior cruciate ligament reconstruction, overloading either 1 of the 2 grafts should be avoided to decrease the risk of graft failure.

Hypothesis: Overloading of the posterolateral graft may occur when it is fixed at 30 degrees of knee flexion because the posterolateral bundle is elongated as the knee approaches extension.

Study Design: Controlled laboratory study.