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Background: Patch testing is the gold standard diagnostic test for allergic contact dermatitis and needs to be relevant to the region and the population being tested. The aim of this study was to develop a specific New Zealand baseline series (NZBS). Method:We performed a retrospective case note review of patients attending four regional patch test centres between 2008 and 2020. Demographic and diagnostic information was collected for each patient along with results of patch testing. Using the results of this review, a group of 11 dermatologists with an interest in contact dermatitis agreed on a core group of allergens for inclusion in an NZBS, based on the frequency of positive reactions and allergens of interest. The remaining potential allergens were ranked by each dermatologist using an online questionnaire, with inclusion in the final NZBS by consensus.Results: Results from 2402 patients (67% female, mean age 44 years) from Auckland, Wellington, Palmerston North and Christchurch were collated. The 10 most frequent positive (relevant and nonrelevant) allergens were nickel sulfate (22.0%), fragrance mix I (8.6%), cobalt chloride (7.3%), Myroxylon pereirae (5.6%), colophonium (5.1%), p-phenylenediamine (4.9%), methylisothiazolinone/ methylchloroisothiazolinone (4.1%), fragrance mix II (3.9%), potassium dichromate (3.5%) and methylisothiazolinone (3.4%). Based on these results, a core series of 30 allergens was developed, with an additional 30 allergens added to form the extended series (total 60 allergens). Conclusion:The baseline series of patch test allergens for routine use in New Zealand (NZBS) is based on national patch test data and expert consensus.

Aim Developmental dysplasia of the hip (DDH) is a condition affecting newborns, in which abnormal acetabulum development can result in femoral head subluxation or dislocation. This study aims to retrospectively evaluate radiological outcomes of patients with DDH, treated by either closed reduction, open reduction, or open reduction with osteotomy. Method This study included 59 hips of 54 patients with a median age of 19.6 months at the time of surgery. Radiographs were assessed for the International Hip Dysplasia Institute (IHDI) grade of dislocation, acetabular index (AI), centre-edge angle (CEA), Severin classification and avascular necrosis (AVN). Results Median duration of follow up between primary operation and latest available radiograph was 4.9 years. Pre-operatively, 41 hips were IHDI Grade IV, 16 hips were Grade III and two hips were Grade II. Mean pre-operative AI was 37.9°, which decreased to 22.7° at the latest follow up. Mean CEA was 22.9°. 25 hips were found to be Severin class I, eight hips were class II and three hips were class III. Four hips developed Group II AVN and one hip developed Group III. Nine hips required further surgery. Conclusions The study found overall favourable radiological outcomes of treatment of DDH, with minimal differences between each operation. Longer follow up is needed to evaluate time-dependent outcomes such as Severin class and AVN. A patient-reported outcome questionnaire is necessary to provide information on the correlation of radiological outcomes and physical function.