Triceps Split and Snip Approach for Distal Humerus Fractures.

Background: The senior author adopted a Triceps Split and Snip approach in 2011. This paper details the results of patients for whom this approach was utilised for open reduction and internal fixation of complex AO type C distal humerus fractures. Methods: A retrospective analysis of a single surgeon's cases was conducted. Range of movement, as well as Mayo Elbow Performance Score (MEPS), and QuickDASH scores were evaluated. Two independent consultants with upper extremity practises evaluated pre- and post-operative radiographs. Results: Seven patients were available for clinical review. The mean age at the time of surgery was 47.7 years (range, 20.3-83.2) and the mean follow-up time was 3.6 years (range, 0.58-8). The average QuickDASH score was 15.85 (range, 0-52.3), average MEPS was 86.88 (range, 60-100) and average total arc of movement (TAM) was 103° (range, 70°-145°). All patients demonstrated 5/5 MRC triceps strength compared to the contralateral side. Conclusions: The Triceps Split and Snip approach for complex distal humerus fractures provided comparable mid-term clinical outcomes when compared to other published data regarding distal humerus fractures. It is versatile and does not compromise the intra-operative option of conversion to a total elbow arthroplasty. Level of Evidence: Level IV (Therapeutic).

The reverse coracoacromial ligament transfer for "horizontal" acromioclavicular joint instability.

Background: Acromioclavicular (AC) horizontal instability is a problem affecting not only young athletic patients after a trauma to the AC joint but also older patients who have undergone distal clavicle resection. It may cause pain and poor functional outcomes unless the reconstruction technique specifically addresses the horizontal instability of the clavicle, in addition to the well-known superior instability. Methods: Three cadaveric specimens underwent dissection of the AC joint capsule to determine the superior attachments of the AC joint capsule. These shoulders subsequently underwent distal clavicle resection and were loaded to a 7-kg weight in the horizontal plane. The horizontal displacement of the clavicle was measured and resection continued to the point of horizontal instability of the clavicle. Thereafter, the reverse coracoacromial ligament reconstruction technique was performed and recreation of horizontal stability assessed. Utilization of the reverse coracoacromial ligament transfer in two clinical cases will also be presented. Results: The AC joint capsule is continuous with trapezius and deltoid insertions. The average distance between the articular surface and insertion of the capsule on the clavicle is 10 mm and on the acromion is 14.8 mm. Horizontal clavicular translation increased from 2.3 mm when intact to 3.3 mm with capsular transection, 8.7 mm with 5 mm clavicle resection, and finally 15 mm with a 10-mm clavicle resection. Horizontal instability of the clavicle was demonstrated with a 10-mm clavicle resection. Conclusion: Horizontal instability of the clavicle is evident with distal clavicle resection of greater than 10 mm. A reverse coracoacromial ligament transfer may be a reasonable technique to address horizontal stability of the clavicle during AC joint reconstruction in the context of painful instability.

Low sensitivity of implant sonication when screening for infection in revision surgery.

Background and purpose - Prosthetic-joint infection (PJI) is the most serious complication of arthroplasty, and accurate identification of a potentially responsible microorganism is essential for successful antibiotic treatment. We therefore determined the diagnostic accuracy of sonication and compared it with tissue culture as a screening tool in detecting prosthetic joint infection in revision arthroplasty. Patients and methods - 252 consecutive revision arthroplasty cases were enrolled. These cases were determined as being suspected or unsuspected of having infection according to standard criteria. Perioperatively, 6 periprosthetic interface tissue biopsies were obtained from each patient and the implants removed were sonicated. The sensitivity and specificity of periprosthetic tissue culture and sonication fluid cultures were determined. Results - Preoperatively, 75 revision cases were classified as having PJI (33 early and 42 late) and 177 were unsuspected of having infection. Compared with tissue culture, the sensitivity of the sonication fluid analysis was low: 0.47 (95% CI: 0.35-0.59) for sonication as compared to 0.68 (95% CI: 0.56-0.78) for tissue culture. The specificity of the sonication fluid analysis was higher than that for tissue culture: 0.99 (95% CI: 0.96-1.0) as compared to 0.80 (95% CI: 0.74-0.86). Interpretation - Sonication is a highly specific test for diagnosis of PJI. However, due to the low sensitivity, a negative sonication result does not rule out the presence of PJI. Thus, sonication is not of value for screening of microorganisms during revision surgery.