Occurrence of inadequate ACL healing after Dynamic Intraligamentary Stabilization and functional outcome-a multicentre case series.

INTRODUCTION: Dynamic Intraligamentary Stabilization (DIS) is a technique for preservation, anatomical repair and stabilization of a freshly injured anterior cruciate ligament (ACL). The main purpose of this study was to evaluate the short-term re-operation rate when compared to traditional autograft reconstruction. METHODS: Four, from the developer independent, centres enrolled patients that underwent ACL repair by DIS, according to the specific indications given by MRI imaging at a minimum follow-up of 12 months. The re-operation rate was recorded as primary outcome. Secondary outcome measures were the postoperative antero-posterior knee laxity (using a portable Rolimeter®), as well as the Tegner, Lysholm and IKDC Scores. RESULTS: A total of 105 patients were investigated with a median follow-up of 21 months. Thirteen patients were lost to follow-up. Of the remaining 92 patients 15 (16.3%) had insufficient functional stability and required subsequent ACL reconstruction. These patients were excluded from further analysis, leaving 77 consecutive patients for a 12 months follow-up. The median age at time of surgery was 30 years for that group. At time of follow-up a median antero-posterior translation difference of 2 mm was measured. None of these patients reported subjective insufficiency (giving way), but in 14 patients (18.2%), the difference of antero-posterior translation was more than 3 mm. We found a median Tegner Score of 5.5, a median Lysholm Score of 95.0 and a median IKDC Score of 89.4. CONCLUSION: The main finding of this multicentre study is a relevant re-operation rate of 16.3%. Another 18.2% showed objective antero-posterior laxity (≥ 3 mm) during testing raising the suspicion of postoperative non-healing. The failure rate of DIS in this study is higher than for reconstruction with an autologous tendon graft. However, our successfully treated patients had a good clinical and functional outcome based on antero-posterior knee laxity and clinical scores, comparable to patients treated by autograft reconstruction.

A pilot case-control study of behavioral aspects and risk factors in Swiss climbers.

BACKGROUND: Climbing is a popular sport in Switzerland, with approximately 100 000 active participants. There is an inherent risk of falls, overuse and stress-related trauma, with a reported injury rate of 4.2 injuries per 1000 climbing hours. OBJECTIVE: Comparison of possible risk factors in patients and noninjured controls. METHODS: A case-control survey was conducted. Climbers admitted to three trauma units between June and October 2008 were surveyed using a questionnaire evaluating nine potential risk factors. The same questionnaire was distributed to noninjured climbers during the same time period. Logistic regression was performed. RESULTS: Fifty patients and 63 controls were included in this survey. Variables significant for patients were: more than 10 years versus less than 1 year of climbing experience (odds ratio: 5.34; confidence interval: 1.16-17.76; P=0.006) and no previous experiences of the climbing route (odds ratio: 2.72; confidence interval: 1.15-6.39; P=0.022). No statistical significance was detected for age, sex, difficulty level of the climbing route, warm-up, readiness for risk and abstinence from alcohol and drugs. CONCLUSION: Climbers with higher experience seem to be more prone to injuries. Larger studies on this subgroup are warranted, to identify typical risk profiles and to develop preventive strategies. Furthermore, climbers should be advised about the increased injury risk when trying new climbing routes and specific information should be given.

Are there risk factors for snowboard injuries? A case-control multicentre study of 559 snowboarders.

OBJECTIVE: To analyse risk factors leading to injuries during snowboarding. DESIGN: A case-control multicentre survey of injured and non-injured snowboarders. SETTING: One tertiary and two secondary trauma centres in Bern, Switzerland. METHODS: All snowboard injuries admitted to our tertiary and two affiliated secondary trauma centres from 1 November 2007 to 15 April 2008 were analysed on the basis of a completed questionnaire incorporating 15 variables. The same questionnaire was applied in non-injured controls at valley stations after a snowboarding day during the same period. A multiple logistic regression was performed (dichotomous variables). Patterns of combined risk factors were calculated by inference trees. RESULTS: 306 patients and 253 controls were interviewed. The following variables were statistically significant for the injured PATIENTS: low readiness for speed (OR 0.20, 95% CI 0.06 to 0.64, p=0.0037), bad weather/visibility (OR 19.06, 95% CI 2.70 to 134.73, p=0.0031) and old snow (OR 0.11, 95% CI 0.02 to 0.68, p=0.0323). Not wearing a helmet and riding on icy slopes emerged as a combination of risk factors associated with injury. CONCLUSIONS: Several risk factors and combinations exist, and different risk profiles were identified. Future research should be aimed at more precise identification of groups at risk and developing specific recommendations for each group-for example, a snow-weather conditions index at valley stations.