Analysis of Proximal Tibial Resection Surface Dimention with Korean Total Knee Arthroplasty Specimens

In shape and dimensions, the tibial plateaus are asymmetric with the larger medial tibial plateau and both have a posterior inclination with respect to the shaft of the tibia. Maximizing tibial coverage is an impotant consideration in total knee arthroplasty to provide stahility and load transfer and to improve long-term survival rate of the implants. Most tihial tray designs are symmetric, but several asymmetric designs are available. We evaluated the proximal tibial resection surface during total knee aithroplasty to delineate the tibial plateaus in korean. After tihial bone cut during 100 TKA procedures, the outline of tibial resection suiface was traced and rotational axis of true tibial component was marked intraoperatively. A line was drawn at the maximal anteroposterior (AP) diameter of lateral tibial condyle with parallel to rotational axis of component, and then a transverse axis was drawn at the midpoint of maximal AP diameter of 1ateral tibial condyle. Anteroposterior 10, 20, 30., 40% and midpoint from the media1 and lateral peripheries were calculated manually. The average AP medial 10, 20, 30 and 40% dimensions were 34.7, 43.8, 48.0 and 43.2mm, respectively. The average AP lateral 10, 20, 30 and 40% dimensions were 30.2, 38.4, 42.0 and 40.9mm, respectively. The ratio of medial/lateral AP dimensions 10, 20, 30 and 40% from periphery were 116.9, 114.7, 114.5 and 106.4%, respectively. From these data, we know the asymmetry of the proxirnal tibia1 plateaus in korean. We hope that rnore data will be ohtained in multicenter studies and it will help us to select tibia1 tray and to design the tibial component in korean. But, more accurate standard measures will he need to minimize an error of measurements.

Primary Repair and Autogenous Tendon Augmentation for Acute ACL Injury

The purpose of this study is to evaluate the results of primary repair and autogenous tendon augrnentation for acute rupture of anterior cruciate ligament. We primarily repaired 13 cases of acute ACL injury with autogenous tendon augmentation between Jul. 1988 and Jan. 1996. Among 13 cases, there were 2 isolated ACL injuries and 11 cases were combined with MCL injuries. All 13 cases were followed up over 1 year. An average follow up period was 4.1 years (1.1 - 8). All patients had open primary rnultiple suture repair and semitendinosus tendon (11 cases) or iliotibial band (2 cases) augmentation at average 3.6 days after the injury. In 11 cases, medial collateral ligarnent injuries were noted and these ruptured ligaments were supplemented with staple or vicryl suture. We evaluated the results with Lysholm Knee Score, KT-1000 arthrometer, postoperative ROM of knee, thigh muscle atrophy, extension lag, Lachman and pivot shift test. The clinical results were as follows 1. Lysholm Knee Score was mean 87.2 points; over 90 points: 5 cases, 80-8$ points: 5 cases, 70-79 points: 3 cases 2. Using the KT-1000 arthrometer, the average side to side difference wm 1.8nun in 201b (89N) and the compliance index was average 1.7mm. 3. Postoperative ROM of knee was nearly normal and there was no extensioe lag in any cases. But, we performed arthroscopic adhesiolysis in one case for limited motion of knee joint a ( postoperative 8 months. Thigh circumference was measured 0.95 cm difference than the healthy side at 10cm above upper pole of patella. 4. Lachman test was positive in 2 cases. 5. Pivot shift test was positive in 2 cases. Even if not many cases, we obtained relatively satisfactory results. So the pirimary repair with autogenous tendon auynentation was recornmandable procedure for acute rupture of ACL, especially combined with MCL injury.