Satisfactory results of unicondylar knee arthroplasty (UKA) have been reported since minimally invasive UKA had been introduced. However, several stress fractures of the tibial plateau, related to instrumentation design, have been reported. We report two cases of periprosthetic stress fractures of the tibial plateau after navigation-assisted unicondylar knee arthroplasties.
Arthroplasty* ; Fractures, Stress* ; Knee*

This article has been retracted.

BACKGROUND: To evaluate the usefulness of the modified lateral pillar classification as a prognostic factor in Legg-Calve-Perthes disease (LCPD). METHODS: Thirty nine patients diagnosed with lateral pillar C in LCPD from May, 1977, to October, 2001 were reviewed, and their skeletal maturity was followed. The mean follow up duration was 12 years and 7 months (4 years, 6 months to 24 years, 9 months). Lateral pillar C classification was divided into C1 (50-75% collapse of the lateral pillar) and C2 (> 75%). All radiological and clinical prognostic factors were evaluated. The final results were evaluated according to the Stulberg classification. RESULTS: Twenty one and 18 of the affected hips were in groups C1 and C2, respectively. According to the Stulberg classification, the final results of group C1 were better than those of C2 (p = 0.002). Patients with more head-at-risk signs had significantly poorer outcomes. CONCLUSIONS: The modified lateral pillar classification has significant value for predicting the prognosis of LCPD.
Adolescent ; Adult ; Chi-Square Distribution ; Child ; Child, Preschool ; Female ; Femur Head/*pathology/radiography ; Follow-Up Studies ; Hip Joint/*pathology/radiography ; Humans ; Legg-Perthes Disease/*classification/*pathology/radiography/therapy ; Male ; Predictive Value of Tests ; Prognosis ; Treatment Outcome ; Young Adult

Navigation systems are currently being widely used in orthopedic surgery, and especially for total knee arthroplasty (TKA) or UKA. The mechanical axis alignment and component insertion can be judged accurately via a navigation system and this also helps in ligament balancing. A navigation system can also be used in ACL reconstruction and High Tibial Osteotomy (HTO). In open-wedge HTO, accurate multiplane measurements of the lower limb alignment can be made intraoperatively in real time, and alignment adjustments can be made as the surgeon desires. Navigation more accurately improves the postoperative lower limb alignment than the conventional cable-method, and it significantly reduces the radiation exposure time. Navigation for ACL reconstruction allows exact placement of the tibial and femoral tunnels and it prevents impingement, and it also significantly improves the results of isometricity of the femoral tunnel and the stability of the reconstructed ACL ligament. Using a navigation system in knee surgery provided useful intraoperative information about the anatomical placement that's done intraoperatively in real time. It helps perform accurate surgery, it improves the radiologically assessed implantation and it allows precise correction of a mechanical axis, and so we can expect improved clinical results.
Arthroplasty ; Axis, Cervical Vertebra ; Knee ; Ligaments ; Lower Extremity ; Orthopedics ; Osteotomy

PURPOSE: The purpose of this study was to evaluate the clinical results of intraoperative periarticular injection for osteoarthritic patients who are treated with total knee arthroplasty (TKA). MATERIALS AND METHODS: Forty patients (2 males and 38 females) who underwent TKA under general anesthesia from January 2007 to May 2007 were enrolled in this study. We classified 20 cases to the injection group and 20 cases to the control group. For the injection group, we injected ropivacaine 40 mg, ketolocac tromethamine 2 mg, epinephrine 0.5 cc and morphine 0.8 cc to the periarticular soft tissue before inserting the prosthesis, and the same amount of saline was injected in the control group. We assessed the clinical results according to preoperative and postoperative range of motion (ROM), the visual analogue scale (VAS), and the dosage of the patient controlled anesthesia (PCA) in both groups. RESULTS: There was no significant difference in preoperative ROM and VAS between the groups (p>0.05). However, significant differences between the groups were reported for the postoperative ROM at 6 and 12 hour. In terms of the VAS, it showed significant differences between the groups at 6 and 12 hours and at the first and second days after operation. The dosage of PCA was significantly lower at postoperative 6 and 12 hours. CONCLUSION: For the patients treated with TKA, periarticular injection to the operation site is supposed to be an effective method at the early stage for recovery of the ROM, the postoperative pain control and to decrease of the PCA dosage.
Amides ; Anesthesia ; Anesthesia, General ; Arthroplasty ; Epinephrine ; Humans ; Knee ; Male ; Morphine ; Pain, Postoperative ; Passive Cutaneous Anaphylaxis ; Prostheses and Implants ; Range of Motion, Articular ; Tromethamine

Background: Melanoma is one of the most aggressive and metastatic skin cancers. Although overexpression of Dock180 and Elmo1 has been identified in various cancers, including glioma, ovarian cancer, and breast cancer, their expression and functions in melanoma remain unknown. Objective: This study aims to confirm the expression of Dock180 and Elmo1, their underlying mechanisms, and roles in melanoma. Methods: Both immunohistochemical staining and Western blotting were used to confirm expression of Dock180 and Elmo1 in human melanoma. To identify roles of Dock180 and Elmo1 in cell survival, apoptosis and migration, downregulation of Dock180 or Elmo1 in melanoma cells with small interfering RNA (siRNA) was performed. Results: We identified overexpression of Dock180 and Elmo1 in human melanoma compared to normal skin ex vivo. Inhibition of Dock180 or Elmo1 following siRNA in melanoma cells reduced cell viability and increased apoptosis as supported by increased proportion of cells with Annexin V-PE (+) staining and sub-G0/G1 peak in cell cycle analysis. Moreover, inhibition of Dock180 or Elmo1 regulated apoptosis-related proteins, showing downregulation of Bcl-2, caspase-3, and PARP and upregulation of Bax, PUMA, cleaved caspase-3, and cleaved PARP. Furthermore, knockdown of Dock180 and Elmo1 in melanoma cells reduced cell migration and changed cellular signaling pathways including ERK and AKT. Vemurafenib decreased cell viability in concentration-dependent manner, while transfection with Dock180- or Elmo1-specific siRNA in melanoma cells significantly reduced cell viability. Conclusion Our results suggest that both Dock180 and Elmo1 may be associated with cancer progression, and can be potential targets for treatment of melanoma.

BACKGROUND: Few scales are currently available to evaluate changes in hand volume. We aimed to develop a hand grading scale for quantitative assessments of dorsal hand volume with additional consideration of changes in skin texture; to validate and prove the precision and reproducibility of the new scale; and to demonstrate the presence of clinically significant differences between grades on the scale. METHODS: Five experienced plastic surgeons developed the Hand Volume Rating Scale (HVRS) and rated 91 images. Another five plastic surgeons validated the scale using 50 randomly selected images. Intra- and inter-rater agreement was calculated using the weighted kappa statistic and intraclass correlation coefficients (ICCs). Paired images were also evaluated to verify whether the scale reflected clinical differences. RESULTS: The intra-rater agreement was 0.95 (95% confidence interval, 0.922–0.974). The interrater ICCs were excellent (first rating, 0.94; second rating, 0.94). Image pairs that differed by 1, 2, and 3 grades were considered to contain clinically relevant differences in 80%, 100%, and 100% of cases, respectively, while 84% of image pairs of the same grade were found not to show clinically relevant differences. This confirmed that the scale of the HVRS corresponded to clinically relevant distinctions. CONCLUSIONS: The scale was proven to be precise, reproducible, and reflective of clinical differences.
Asian Continental Ancestry Group ; Hand ; Humans ; Plastics ; Rejuvenation ; Skin ; Skin Aging ; Surgeons ; Weights and Measures