| Summary: | Background Among the causative lesions of lateral elbow pain, atraumatic posterolateral rotatory instability (PLRI) is a rare condition, but it produces pain and disability to the elbow. It still lacks published specific treatment literature. According to the development of arthroscopy, the arthroscopic lateral collateral ligament (LCL) imbrication can possibly be an alternative minimal invasive procedure that can eradicate the atraumatic PLRI. Hypothesis/Purpose: To report clinical results of arthroscopic LCL imbrication for the treatment on atraumatic PLRI elbow. Methods: Thirty-three patients with chronic atraumatic lateral elbow pain were presented to our institution between July 2015 and December 2021. Eight patients were diagnosed with atraumatic PLRI and underwent arthroscopic LCL imbrication. Comparison between the pre- and post-operative scores were recorded, which were The Quick-Disabilities of Arm, Shoulder, and Hand (Quick-DASH) score, Mayo Elbow Performance Index (MEPI) and Visual Analog Scale for pain (VAS). Results: Mean follow-up was 16 months (9–24 months). Comparing between pre-operation and post-operation, all of eight patients had significant improved Quick-DASH score (mean 55.62 vs 7.62, p = .004), MEPI (mean 50.00 vs 96.87, p = .000) and VAS for pain (mean 8.14 vs 1.28, p = .000). Conclusion: Atraumatic PLRI is a concerning lesion in patients with lateral elbow pain. Arthroscopic LCL imbrication can be simultaneously performed with other lateral elbow pain causations, such as tennis elbow and pathological plica, and provide painless, stable, and functional elbow. Level of evidence Case Series (Level of evidence: 4).
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