Secunderabad, Telangana, India
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The posterior cruciate ligament, or PCL, is the strongest ligament of the knee. While the anterior cruciate ligament or ACL is injured more often than the PCL and is more commonly discussed, a torn PCL accounts for more than 20% of reported knee injuries. The ACL sits in front of the PCL location in the knee. A torn PCL is commonly missed and left undiagnosed.
The posterior cruciate ligament’s most important function is to prevent posterior translation of the knee at higher knee flexion angles. Thus, patients commonly complain of deceleration problems, problems going downstairs and incline, or general twisting, turning or pivoting activities.
PCL injuries are classified according to the amount of injury to the functional ligament:
CT scan of a failed ACL reconstruction demonstrating the wide diameter of the previous ACL tibial reconstruction tunnel. These tunnels will become larger in some patients than when they were originally reamed, especially for hamstring autografts or cadaver allografts. If they are larger than 12 to 14 mm in diameter or are in a position where an anatomic positioning of the ACL reconstruction graft would break into the previously malpositioned tunnel, then a two-staged surgery would be recommended. This would involve bone grafting of the tunnels and, once the tunnels heal in approximately four to six months, to proceed with a revision ACL reconstruction in the correct anatomic position.
In general, Dr. LaPrade will perform a PCL surgery on all injuries that present themselves as a grade 3. A higher-level athlete may be recommended to proceed with a PCL reconstruction sooner because the results of acute reconstructions are much better than chronic reconstructions.
When Dr. LaPrade does find that a patient needs PCL surgery, he thoroughly assesses the patient to see if there is a concurrent injury. In our hands, approximately 90% of patients who have asymptomatic PCL tear limiting their function also have a posterolateral corner, posteromedial injury, or other associated injuries. Thus, the incidence of isolated PCL reconstructions in our own series is approximately 10% of the total PCL reconstructions performed.
Lateral knee x-ray demonstrating an anatomic tibial tunnel position of a double-bundle PCL reconstruction. In particular, the tibial tunnel should be located at the lower position of the PCL facet to avoid any injury to the medial meniscus root attachment.
Dr. LaPrade has found that a double bundle PCL reconstruction has been extremely effective in restoring knee stability to the patient both objectively with PCL stress x-rays as well as subjectively based on patients independently evaluating their outcome scores.
Dr. LaPrade’s surgical PCL reconstruction technique involves the creation of a closed socket tunnel in the femur for both the anterolateral and posteromedial bundles of the PCL. The graft is fixed in that location and pulled distally down the tibia. The anterolateral bundle is fixed at 90° of knee flexion with an anterior force on the knee and distal traction on the graft. After the anterolateral bundle is fixed to the tibia at 90° of knee flexion, the posteromedial bundle is next fixed in full extension.
Our PCL rehab program allows patients to initiate prone knee flexion at 0-90° on day one. The patients use a PCL brace, preferably a PCL Rebound brace, for 6 months postoperatively at all times, except to shower or change clothes, to reduce the posterior gravitational stress to the knee. We also recommend that high-level athletes utilize a PCL Rebound brace at least through the completion of the first competitive season after the PCL reconstruction to unload the PCL graft and protect it while it remodels.
We have found that our rehabilitation program, which may be considered aggressive by other treatment centers, has not resulted in any of our grafts stretching out over time and has demonstrated a much quicker return of knee motion, decreased risk of knee stiffness, and a higher level of function.
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