Gender differences following computer-navigated single- and double-bundle anterior cruciate ligament reconstruction.

PURPOSE: Female patients not only demonstrate an increased risk for injury, but also a poorer response following anterior cruciate ligament (ACL) rupture. However, no study has investigated gender-related differences between computer-navigated single-bundle (SB) and double-bundle (DB) ACL reconstruction. The aim of this study was to evaluate the effects of gender on the outcome of computer-navigated SB and DB ACL reconstruction and to present reference values. METHODS: A retrospective review of 55 consecutive patients who underwent SB (15 males, 12 females) and DB (18 males, 10 females) ACL reconstruction with autogenous hamstring tendon grafts and showed a minimum follow-up of 24 months was conducted. Intraoperatively, the anteroposterior and rotational laxity were measured and the follow-up examination included pivot-shift testing, KT-1000 arthrometer testing, International Knee Documentation Committee (IKDC) form, the Lysholm score and Tegner score. RESULTS: Pre-operatively, female patients showed a significant higher internal rotation in (p < 0.001) both the SB and DB group. Regarding the post-operative reduction in internal rotation, females in the SB group revealed a greater reduction compared to males (p < 0.001), whereas females in the DB group revealed a significantly greater post-operative reduction in anterior-posterior translation (p = 0.04). Female patients following DB ACL reconstruction presented a significant worse IKDC score, Lysholm score and Tegner score compared to male patients. All score values of the female DB group were worse than in the female SB group. In contrast, male patients showed better results of all examined clinical scores following DB procedure compared to SB technique. CONCLUSION: Female patients who underwent computer-navigated DB ACL reconstruction exhibited significantly worse outcome scores than males who underwent DB ACL reconstruction. The gender-based relationship between joint function and outcome after ACL reconstruction remains unclear and requires further investigation. LEVEL OF EVIDENCE: Retrospective case-control series, Level III.

Thoracic Injuries in Pediatric Polytraumatized Patients: Epidemiology, Treatment and Outcome.

PURPOSE: The purpose of the present study was to assess the influence and contribution, epidemiology, treatment and outcome of thoracic injuries in a cohort of pediatric and adolescent polytraumatized patients. MATERIAL AND METHODS: All pediatric and adolescent (age < 18 years) polytraumatized patients with associated thoracic injuries were included in this study. Demographic data, mechanism of injury (MOI), injury severity score (ISS), Glasgow Coma Scale (GCS), hemodynamic parameters and pupillary response at ED admission, site of major injury (SOMI), associated chest and non-chest related injuries, length of hospital stay (LOS), procedures performed at the ED as well as outcome variables including mortality and cause of death. Stepwise logistic regression analysis was used to identify risk factors for a poor prognosis and outcome. RESULTS: The logistic regression found the following variables decreasing the odds for a "bad outcome": lack of a hemodynamically unstable condition (p = 0.009) and the absence of a pathological pupillary response (p < 0.001). CONCLUSIONS: The present study suggests that the severity of concomitant chest injuries in polytraumatized pediatric and adolescent patients contributes substantially to morbidity and mortality. Due to the anatomic features of the immature pediatric bones, careful attention should be drawn to possible severe chest injuries even in the absence of rib fractures. LEVEL OF EVIDENCE: A retrospective study (level - IV study).

Rotational and translational laxity after computer-navigated single- and double-bundle anterior cruciate ligament reconstruction.

Based on biomechanical cadaver studies, anatomic double-bundle reconstruction of the anterior cruciate ligament (ACL) was introduced to achieve better stability in the knee, particularly in respect of rotatory loads. Previously, the success of ACL reconstruction was believed to be mainly dependent on correct positioning of the graft, irrespective of the number of reconstructed bundles for which computer-assisted surgery was developed to avoid malpositioning of the tunnel. The aim of the present study is to compare rotational and translational stability after computer-navigated standard single-bundle, and anatomic double-bundle ACL reconstruction. The authors investigated 55 consecutive patients who had undergone the single-bundle or double-bundle ACL reconstruction procedure with the use of autogenous hamstring tendon grafts and EndoButton fixation, and the patients had been followed for a minimum period of 24 months. Intraoperative, anteroposterior and rotational laxity was measured with the computer navigation system, and compared between groups. Both surgical procedures significantly reduced anteroposterior displacement (AP) and internal rotation (IR) of the tibia compared to the pre-operative ACL-deficient knee (P < 0.05). No significant differences were registered between groups with regard to anteroposterior displacement of the tibia. A significantly greater reduction in internal rotation was noted in the double-bundle group (15.6 degrees) compared to the single-bundle group (7.1 degrees). The IKDC and Lysholm score were significantly higher in the double-bundle group. However, the results were excellent in both groups. The use of a computer-assisted ACL reconstruction, which is a highly accurate method of graft placement, could be useful for inexperienced surgeons to avoid malposition. Whether double-bundle ACL reconstruction, which was associated with improved rotational laxity and significantly better IKDC and Lysholm scores compared to the standard single-bundle ACL reconstruction procedure, provide an influence in terms of avoiding osteoarthritis or meniscus degeneration, long-term results of at least 5 years are needed.

The use of the LARS system in the treatment of AC joint instability - Long-term results after a mean of 7.4 years.

BACKGROUND: The acromioclavicular (AC) joint is of great importance for shoulder stability and one of the most frequently injured regions of the shoulder. HYPOTHESIS: AC joint reconstruction with the ligament augmentation & reconstruction system (LARS™) leads to a good-to-excellent outcome at long-term follow-up. PATIENTS AND METHODS: This study was performed as a retrospective single-centre data analysis of a level-I trauma centre. All patients treated operatively for an acute AC dislocation with the LARS™ between 2003 and 2013 were included. RESULTS: The study group consisted of three female (6%) and 44 male patients (94%) with an average age of 37 years and a minimum follow-up of two years. The overall mean clinical outcomes at latest follow-up were: Constant 93, DASH 2.64, ASES 96, SST 97, UCLA 34 and VAS 0.4-representing a good-to-excellent outcome in all patients. Overall, 45 patients (96%) reported to be very satisfied with the achieved result at latest follow-up. In five patients, (11%) complications occurred during the follow-up period, requiring surgical revision in four of the five patients (80%). CONCLUSION: AC joint reconstruction with the LARS™ achieves good-to-excellent clinical and functional outcomes at long-term follow-up with a surgical revision rate of 8.5%. LEVEL OF EVIDENCE: Retrospective follow-up study, case series, level IV.