PurposeSince the existence of an extra-articular deformity seriously alters the normal geometry and kinetics around the knee joint, difficulties are often encountered in total knee arthroplasty (TKA) using a standard surgical technique. The purpose of this study was to evaluate the usefulness of surgical navigation system as a treatment option for osteoarthritic knees with extra-articular deformity.Materials and MethodsThe authors retrospectively reviewed medical records of the patients who underwent primary TKA between 2007 and 2012. Knees with preoperative radiography showing an angular deformity within the region from the middle third of the femur to the middle third of the tibia in the ipsilateral limb of the arthritic knees were considered as cases having extra-articular deformity. Thirteen knees of the 13 patients were found to have undergone TKA using a navigation system for osteoarthritis with ipsilateral extra-articular deformity. The hip-knee-ankle angle, Knee Society score (KSS), and range of motion were measured before and after the operation to evaluate the improvement.ResultsThe mean hip-knee-ankle angle in the coronal plane was improved to 0.2°±4.5° in valgus alignment postoperatively. The KSS was improved to 89.6±4.6 points postoperatively at the last follow-up, with over 90% of good and excellent results. The range of motion was improved to 118.5°±10.5° postoperatively.ConclusionsNavigation-assisted TKA is a good treatment option of osteoarthritic knees with extra-articular deformity.

Osteosarcoma commonly develops around the knee joint, and rarely in the hand. Patients with osteosarcoma of the hand often present with pain and swelling, and osteosarcoma of the hand has a biological behavior that differs from that of osteosarcoma at conventional sites. However, although it usually occurs in the older age group, compared with conventional osteosarcoma, the most common sites of hand osteosarcoma correlate with the most active growth and longest growing bones in the hand like conventional osteosarcoma, particularly in the metacarpophalangeal joints in the second and third digits. However, development of osteosarcoma in the metacarpal bone of the hand in an elderly patient has not yet been reported in the country. Thus, we report on two cases of osteosarcoma in the metacarpal bone of the hand in elderly patients, treated by ray amputation of the digit and preoperative and postoperative chemotherapy.

Results: Ninety-eight of 102 patients (96.1%) showed radiographic union at an average time of 12.7 weeks. Modified Mayo wrist score was 87.5 points in an average. Ninety-two of 102 patinets (91.3%) showed more than good results.There was no major complications. There was no statistically significant difference between the preoperative and postoperative radiolunate angle, scapholunate angle, or height to length scaphoid ratio. Conclusion:Herbert screw fixation through dorsal approach was a reliable method for patients of scaphoid nonuinion to achieve bony union with high functional scores and without major complications.

Purpose:We compared the results between conservative and surgical treatment methods in a group of children and adolescents with osteochondritis dissecans of the talus. Materials and Methods: A total of 24 patients (31 ankles), who were younger than 18 years old, were included in this study. Group 1 consisted of 14 ankles (mean age at the time of treatment was 13.0 years) treated conservatively. Group 2 consisted 17 ankles (mean age at the time of treatment was 15.1 years) treated surgically. According to the Berndt and Harty classification, there were 6 ankles in class I, 4 in class II, 3 in class III, and 1 in class IV in group 1; 1 ankle in class I, 9 in class II, and 7 in class III in group 2. In group 1, there were 13 medial lesions and 1 lateral lesion; and in group 2, there were 14 medial lesions and 3 lateral lesions. The mean follow-up period was 31.9 months for group 1 and 28.9 months for group 2. Clinical and radiologic results were analyzed using the American Orthopaedic Foot and Ankle Society (AOFAS) score and the classification by Higuera et al. Results:The mean AOFAS clinical score was 91.4 in group 1 and 87.5 in group 2. According to the classification by Higuera et al., regarding clinical results, there were 6 excellent, 7 good, and 1 fair in group 1, and 5 excellent, 2 good, and 10 fair in group 2. As for radiological results, there were 13 good and 1 fair in group 1, and 10 good and 7 fair in group 2. There was no statistical difference between the two groups. Conclusion: Conservative treatment provided satisfactory results for osteochondritis dissecans of the talus in children and adolescents.