Combined knee injuries of the anterior cruciate ligament (ACL), medial collateral ligament (MCL), and medial meniscus were called “the unhappy triad” in the past. With recent advances in diagnostic technology, combined ACL, MCL, and lateral meniscus injuries are now known to be the predominant triad. We examined and verified the treatment outcomes of the triad of combined knee injuries from both patient-based subjective evaluation and objective assessments. We studied 49 knees (49 patients) with combined injuries of the ACL, MCL, and lateral meniscus. These cases were divided into those who underwent simultaneous ACL and MCL reconstruction (group A, 18 cases) and those who underwent ACL reconstruction only because MCL injury could be treated conservatively (group B, 31 cases). Clinical evaluation was conducted preoperative and 24 months or longer after surgery. The methods included patient-reported outcomes using Short Form-36, and conventional assessments using Lysholm's score, visual analogue scale (VAS), and quantitative measurement of knee instability using Telos SE. Compared with presurgical scores, the postsurgical Short Form-36 scores showed improvements in all eight subscales, all reaching the national standard values. Significant improvements were observed in the five subscales in group A and seven subscales in group B. Furthermore, significant improvements in Lysholm's score, VAS pain score, and quantitative knee instability were achieved in both groups. This study demonstrated successful clinical outcomes in patients with a triad of knee injuries who were treated with lateral meniscus repair or partial meniscectomy and either combined MCL/ACL reconstruction or ACL reconstruction alone.

膝关节前交叉韧带（ACL）、内侧副韧带（MCL）和内侧半月板的联合损伤过去被称为“不幸三联征”。随着诊断技术的最新进展，ACL、MCL 和外侧半月板损伤现在被认为是主要的三联征。我们通过基于患者的主观评估和客观评估来检查和验证复合膝关节损伤三联症的治疗结果。我们研究了 49 名患有 ACL、MCL 和外侧半月板复合损伤的膝关节（49 名患者）。将这些病例分为同时进行ACL和MCL重建的患者（A组，18例）和仅因MCL损伤可以保守治疗而进行ACL重建的患者（B组，31例）。临床评估在术前和术后24个月或更长时间内进行。这些方法包括使用 Short Form-36 的患者报告结果、使用 Lysholm 评分、视觉模拟评分 (VAS) 的常规评估以及使用 Telos SE 定量测量膝关节不稳定性。与术前评分相比，术后Short Form-36评分在所有8个分量表上均有改善，均达到国家标准值。A 组的 5 个分量表和 B 组的 7 个分量表均观察到显着改善。此外，两组的 Lysholm 评分、VAS 疼痛评分和定量膝关节不稳定性均取得显着改善。这项研究证明了膝关节三联症患者接受外侧半月板修复或部分半月板切除术以及联合 MCL/ACL 重建或单独 ACL 重建治疗的成功临床结果。