Posterolateral Rotatory Instability Develops Following the Modified Kocher Approach and Does Not Resolve Following Interval Repair.

Autor:	Daniels SD; Department of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, Colorado., France TJ; Department of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, Colorado., Peek KJ; Department of Orthopedic Surgery, University of Virginia School of Medicine, Charlottesville, Virginia., Tucker NJ; Department of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, Colorado., Baldini T; Department of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, Colorado., Catalano LW; Department of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, Colorado., Lauder A; Department of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, Colorado.; Department of Orthopedic Surgery, Denver Health Medical Center, Denver, Colorado.
Jazyk:	angličtina
Zdroj:	The Journal of bone and joint surgery. American volume [J Bone Joint Surg Am] 2023 Oct 18; Vol. 105 (20), pp. 1601-1610. Date of Electronic Publication: 2023 Aug 24.
DOI:	10.2106/JBJS.23.00199
Abstrakt:	Background: The modified Kocher and extensor digitorum communis (EDC)-splitting intervals are commonly utilized to approach the lateral elbow. Iatrogenic injury to the lateral ulnar collateral ligament may result in posterolateral rotatory instability (PLRI). in the present cadaveric study, we (1) evaluated lateral elbow stability following the use of these approaches and (2) assessed the accuracy of static lateral elbow radiographs as a diagnostic tool for PLRI. Methods: Ten matched-pair cadaveric upper-extremity specimens (n = 20) were randomly assigned to Kocher or EDC-splitting approaches. Specimens underwent evaluation pre-dissection, post-dissection, and following repair of the surgical interval. Clinical evaluation of lateral elbow stability was performed with the lateral pivot-shift maneuver. Radiographic radiocapitellar displacement was evaluated with the fully extended hanging arm test and on lateral elbow 30° flexion radiographs. Paired Wilcoxon signed-rank tests with Bonferroni correction were utilized to compare groups. Results: All Kocher group specimens (10 of 10) developed PLRI on the pivot-shift maneuver following dissection. No EDC-splitting group specimens (0 of 10) developed instability with pivot-shift testing. The fully extended hanging arm test showed no difference in radiocapitellar displacement between groups (p > 0.008). Lateral elbow 30° flexion radiographs in the Kocher group showed an increased radiocapitellar displacement difference (mean, 8.46 mm) following dissection compared with the pre-dissection baseline (p < 0.008). Following repair of the Kocher interval, the radiocapitellar displacement (mean, 6.43 mm) remained greater than pre-dissection (mean, 2.26 mm; p < 0.008). In the EDC-splitting group, no differences were detected in radiocapitellar displacement on lateral elbow radiographs with either the fully extended hanging arm or lateral elbow 30° flexion positions. Conclusions: The Kocher approach produced PLRI that did not return to baseline conditions following repair of the surgical interval. The EDC-splitting approach did not cause elbow instability clinically or radiographically. The hanging arm test was not reliable for the detection of PLRI. Clinical Relevance: The Kocher interval for lateral elbow exposure results in iatrogenic PLRI that is not detectable on the hanging arm test and that does not return to baseline stability following repair of the surgical interval. Competing Interests: Disclosure: The Disclosure of Potential Conflicts of Interest forms are provided with the online version of the article ( http://links.lww.com/JBJS/H659 ). (Copyright © 2023 by The Journal of Bone and Joint Surgery, Incorporated.)
Databáze:	MEDLINE
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