Kwang-Jun Oh

Do Kyung Lee, MD, Kwang Kyoun Kim, MD, Chang Uk Ham, MD, Seok Tae Yun, MD, Byung Kag Kim MD, and Kwang Jun Oh, MD. Knee Surg Relat Res 1999;0:. https://doi.org/10.5792/ksrr.17.064

Introduction: The purpose of this study was to compare acetabular cup positioning using an imageless navigation-assisted total hip arthroplasty (THA) to a case-matched control group using the conventional technique in Asian physique. Methods: Case matching controlled study using retrospectively collected data for THAs was done. Matching criteria were gender, age ± 5 years, and body mass index ± 5 kg/m². Thirty patients who had navigation THAs were manually matched to a conventional group of 30 patients. After measuring anteversion and inclination on 3-D CT, final cup anteversion was calculated using the mathematical formula (anteversion = arctan [tan (anatomic anteversion) × sin (inclination)]). Results: No significant difference was observed between mean inclination ( p = 0.420), anteversion ( p = 0.697), and the mean deviation from 15° for anteversion ( p = 0.649). However, there was a statistical significant difference for mean deviation from 40° for inclination ( p = 0.027). There was a significant difference in the percentage of correctly placed acetabular cup in safe zones with inclination ( p = 0.039). Conclusions: Although soft tissue overlying the pubic tubercle interfered with registration of the bony landmark and thereby induced inaccuracy of anteversion angles in the navigation group, the use of imageless navigation-assisted technique increases the placement within the safe zone for inclination and enhances the accuracy and the precision of inclination of the acetabular cup relative to the conventional THA rather than anteversion. This finding may be due to the effect of the patient’s physique on the anterior pelvic plane (APP)-based reference system of imageless navigation.

As the population ages, the use of primary total knee arthroplasty (TKA) is on the rise in the octogenarian population.

The purpose of this study was to compare the osteoconductivity, and absorbability of hydroxyapatite or beta-tricalcium phosphate in clinical scenario of opening wedge high tibial osteotomy Total 41 knees of 40 patients with follow up period of more than 1 year were enrolled. These patients were divided into two groups, Group I (22 knees, 21 patients) used hydroxyapatite and Group II (19 knees, 19 patients) used beta-tricalcium phosphate as a substitute in the opening gap. According to proven method, the osteoconductivity was assessed radiographically by the extent of new bone formation at osteotomy space and absorbability was evaluated by measuring the area occupied by substitute at immediate postoperative, postoperative 6 months and 1 year. Regarding preoperative demographic data, no significant differences were found between two groups. No statistically significant differences were found between two groups regarding lower limb alignment (mechanical femorotibial angle, weight-bearing line%) and posterior tibial slope at postoperative and final follow up radiographs. Concerning the osteoconductivity, there were no significant differences between two groups in any zone. However, the absorption rate was significantly greater in the Group II than in Group I at 6 months (Group I: 13.7 ± 6.8, group II: 35.3 ± 15.8, P = 0.001) and 1 year (Group I: 24.2 ± 6.3, Group II: 49.6 ± 14.3, P < 0.0001). The complications related to bone substitutes were not observed. Both hydroxyapatite and beta-tricalcium phosphate showed satisfactory gap healing without complications and can be successfully used as alternative healing materials in opening wedge high tibial osteotomy. Our study showed that beta-tricalcium phosphate has superior absorbability than hydroxyapatite. But osteoconductivity showed no significant difference.

Young-Bong Ko, MD, Manan Ramesh Gujarathi, DNB (D'Orth), and Kwang-Jun Oh, MD. Knee Surg Relat Res 2015;27:141-8. https://doi.org/10.5792/ksrr.2015.27.3.141

Clinical assessments do not accurately reflect the status of meniscal transplants and cannot evaluate the graft condition itself and joint preservation effects of meniscal allograft transplantation correctly. The purpose of this review was to assess the need and to ascertain the indication and the role of second-look arthroscopy for objective evaluation after MAT. We performed a literature search to identify all published clinical studies on MAT with the following medical subject heading (MeSH) terms: “meniscus,” “meniscal transplant,” “transplantation and allograft,” “meniscal and transplant.” Include in the review are studies with at least 6 months clinical, radiological, and/or histological follow-up in human subjects. Evaluation method of MAT was reviewed with an aim to describe the frequency of second-look arthroscopy, its feasibility, patient compliance, purposes, and results. We identified 15 clinical studies that satisfied our inclusion and exclusion criteria. Only two studies always performed second-look arthroscopies. Most of the second-look arthroscopy was conducted mainly for the objective evaluation of meniscal allograft transplantation but, in several studies, arthroscopy was performed to treatment of other knee problem. Although second-look arthroscopy has inevitably ethical issues, especially for asymptomatic and well-functioning knees, in this review, it could be a more dependable method available to detect meniscal healing if performed for certain indications such as a symptomatic patient with a magnetic resonance image indicating abnormalities.

Yang JH, et al. Hip Pelvis. 2014 Dec;26(4):275-278. http://dx.doi.org/10.5371/hp.2014.26.4.275

Joo YD, et al. Hip Pelvis. 2014 Sep;26(3):178-184. http://dx.doi.org/10.5371/hp.2014.26.3.178

Kim TH, et al. Knee Surg Relat Res. 2014 Mar;26(1):20-26. http://dx.doi.org/10.5792/ksrr.2014.26.1.20