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Background/Objectives: A neck of femur (NOF) fracture is one of the most common fractures, and its treatment in the geriatric population using cemented bipolar hemiarthroplasty (HA) is a standard procedure worldwide. Various surgical approaches have been described for this operation, aiming to reduce complications and improve early mobilization. The present study compares two minimally invasive approaches, the anterolateral minimally invasive approach (ALMIS) and the direct superior approach (DSA), with respect to their intraoperative and early postoperative complications in cemented bipolar HA. Methods: The medical records of all patients undergoing cemented bipolar HA for a NOF fracture between January 2017 and December 2023 were analyzed. The aim of the study was to compare the two surgical approaches. The evaluation focused on intraoperative parameters and early complications. Results: A total of 226 patients were included in the analysis, with 62 undergoing DSA and 164 ALMIS, with an average age of 83.5 years. The two approaches did not differ significantly in terms of stem implantation quality, length of hospital or intensive care unit stay, postoperative mobilization, or the need for transfusions. However, the ALMIS was associated with a significantly shorter operative time (DSA: 89.7 min vs. ALMIS: 77.2 min; p < 0.01). On the other hand, the DSA had a significantly lower complication rate (DSA: 0/61 vs. ALMIS: 11/163; p = 0.04). Conclusions: In a comparison of the two minimally invasive approaches, DSA and ALMIS, for treating a NOF fracture with cemented bipolar HA, the DSA demonstrated a lower complication rate, though it had a slightly longer operating time. [ABSTRACT FROM AUTHOR]

The hook test is a widely used intraoperative method for assessing syndesmosis stability. However, there are no recommendations regarding the force required to perform this test. Furthermore, the reliability of the test is unclear. Ten experienced surgeons performed hook tests on a cadaver bone model. The applied forces were recorded in a blinded manner. In addition, standardized hook tests with defined forces (50, 80, and 100 N) were performed on 10 pairs of cadaver lower legs and the syndesmosis was sequentially destabilized. Diastasis of the syndesmosis was recorded using an optical 3D camera system. A median force of 81 N (Range: 50 N–145 N) was applied. A proportion of 82% of the tests showed a force < 100 N. The data showed good intraraterreliability and poor interraterreliability. In the standardized investigation of the hook test on the cadaver bone model, both the force and the instability of the syndesmosis had a significant influence on the syndesmosis diastasis. Nevertheless, even with maximum instability of the syndesmosis, diastasis > 2 mm could only be measured in 12 of the 19 evaluable specimens. The widely used hook test shows a high variability when performed in practice. Even in a standardized manner, the hook test cannot detect a relevant syndesmosis injury. [ABSTRACT FROM AUTHOR]

In the treatment of ankle fractures, complications such as wound healing problems following open reduction and internal fixation are a major problem. An innovative alternative to this procedure offers a more minimally invasive nail stabilization. The purpose of this biomechanical study was to clarify whether this method was biomechanically comparable to the established method. First, the stability (range of motion, diastasis) and rotational stiffness of the native upper ankle were evaluated in eight pairs of native geriatric specimens. Subsequently, an unstable ankle fracture was created and fixed with a locking plate or a nail in a pairwise manner. The ankles showed significantly less stability and rotational stiffness properties after nail and plate fixations than the corresponding native ankles (p < 0.001 for all parameters). When comparing the two methods, both showed no differences in their range of motion (p = 0.694) and diastasis (p = 0.166). The nail also presented significantly greater rotational stiffness compared to the plate (p = 0.001). However, both fixations remained behind the native stability and rotational stiffness. Due to the comparable biomechanical properties of the nail and plate fixations, an early weight-bearing following nail fixation should be assessed on a case-by-case basis considering the severity of fractures. [ABSTRACT FROM AUTHOR]

Insufficient fixation of a posterior malleolus fracture (PM) can lead to posttraumatic complications such as osteoarthritis and chronic pain. The purpose of this biomechanical study was to test the hypothesis of whether the direction of PM screw fixation has an impact on the primary stability of osteosynthesis of a PM under torsional loading. PM fractures of 7 pairs human cadaveric lower leg specimens were stabilized with posterior to anterior (p.a.) or anterior to posterior (a.p.) screw fixation. Stability of the osteosynthesis was biomechanically tested using cyclic external torsional loading levels, in 2 Nm steps from 2 Nm up to 12 Nm, under constant monitoring with 3D ultrasonic marker (Zebris). The primary stability does not differ between both stabilizations (p = 0.378) with a medium effect size (η2p = 0.065). The movement of the PM tends to be marginally greater for the osteosynthesis with a.p. screws than with p.a. screws. Whether a.p. screws or the alternative p.a. screw fixation is performed does not seem to have an influence on the primary stability of the osteosynthesis of the PM fixation under torsional loading. Although osteosynthesis from posterior seems to be more stable, the biomechanical results in the torsional test show quite equivalent stabilities. If there is no significant dislocation of the PM, a.p. screw fixation could be a minimally invasive but stable surgical strategy. [ABSTRACT FROM AUTHOR]