Abstract：
The discoid medial meniscus is a rare congenital anomaly of the knee. The literature is limited to small case series.
Our purpose is to report the clinical manifestations and operative treatments of discoid medial menisci in children from multiple centers in North America. We hypothesized that symptoms and signs, arthroscopic findings, surgical treatments, and outcomes are similar to those for symptomatic discoid lateral menisci.
Case series; Level of evidence, 4.
A retrospective review identified patients with a diagnosed discoid medial meniscus confirmed at surgery across 8 children\'s hospitals between January 2000 and June 2021. The literature on discoid lateral menisci was reviewed and summarized for comparison.
A total of 21 patients (9 female, 12 male) with 22 discoid medial menisci were identified. The mean ± SD age at the time of diagnosis was 12.8 ± 3.8 years. The most common symptoms and signs were locking and/or clunking, present in 12 of 22 knees (55%), similar to that reported in patients with discoid lateral menisci. Twelve discoid medial menisci were complete (55%); 8, incomplete (36%); and 2, indeterminate (9%). Tears were present in 13 knees, most commonly horizontal cleavage (54%). Five discoid medial menisci were unstable (23%): 3 for posterior tears and 2 for rim insufficiency. All 22 knees underwent arthroscopic saucerization, and of the 13 torn menisci, 7 (54%) were repaired. The median follow-up was 24 months (range, 2-82 months). Four knees underwent reoperation. All knees that required reoperation had undergone repair for a posteriorly located tear. There was a significant association between operative repair and need for reoperation (P = .0048). High rates of peripheral instability were also noted in case series of patients with discoid lateral menisci.
Patient presentations and treatments for those with discoid medial menisci were similar to those reported for patients with discoid lateral menisci. Knees with discoid medial menisci also demonstrated instability attributed to peripheral insufficiency and posterior tears. Tears were present in over half of knees with discoid medial menisci, and reoperation was more common in knees that underwent repair of tears than those without repair.
Our purpose is to report the clinical manifestations and operative treatments of discoid medial menisci in children from multiple centers in North America. We hypothesized that symptoms and signs, arthroscopic findings, surgical treatments, and outcomes are similar to those for symptomatic discoid lateral menisci.
Case series; Level of evidence, 4.
A retrospective review identified patients with a diagnosed discoid medial meniscus confirmed at surgery across 8 children\'s hospitals between January 2000 and June 2021. The literature on discoid lateral menisci was reviewed and summarized for comparison.
A total of 21 patients (9 female, 12 male) with 22 discoid medial menisci were identified. The mean ± SD age at the time of diagnosis was 12.8 ± 3.8 years. The most common symptoms and signs were locking and/or clunking, present in 12 of 22 knees (55%), similar to that reported in patients with discoid lateral menisci. Twelve discoid medial menisci were complete (55%); 8, incomplete (36%); and 2, indeterminate (9%). Tears were present in 13 knees, most commonly horizontal cleavage (54%). Five discoid medial menisci were unstable (23%): 3 for posterior tears and 2 for rim insufficiency. All 22 knees underwent arthroscopic saucerization, and of the 13 torn menisci, 7 (54%) were repaired. The median follow-up was 24 months (range, 2-82 months). Four knees underwent reoperation. All knees that required reoperation had undergone repair for a posteriorly located tear. There was a significant association between operative repair and need for reoperation (P = .0048). High rates of peripheral instability were also noted in case series of patients with discoid lateral menisci.
Patient presentations and treatments for those with discoid medial menisci were similar to those reported for patients with discoid lateral menisci. Knees with discoid medial menisci also demonstrated instability attributed to peripheral insufficiency and posterior tears. Tears were present in over half of knees with discoid medial menisci, and reoperation was more common in knees that underwent repair of tears than those without repair.
摘要：
UNASSIGNED：盘状内侧半月板是一种罕见的先天性膝关节异常。文献仅限于小型案例系列。
UNASSIGNED：我们的目的是报告来自北美多个中心的儿童盘状内侧半月板的临床表现和手术治疗。我们假设症状和体征，关节镜检查结果，手术治疗,结果与有症状的盘状外侧半月板相似。
未经批准：案例系列；证据级别，4.
UNASSIGNED：一项回顾性研究确定了2000年1月至2021年6月间在8家儿童医院手术中确诊的盘状内侧半月板患者。对有关盘状外侧半月板的文献进行了回顾和总结，以进行比较。
未经批准：共有21名患者（9名女性，确定了12名男性）和22个盘状内侧半月板。诊断时的平均±SD年龄为12.8±3.8岁。最常见的症状和体征是锁定和/或碰撞，出现在22个膝盖中的12个（55％），与盘状外侧半月板患者的报道相似。12个盘状内侧半月板完整（55％）；8，不完整（36％）；2，不确定（9％）。眼泪出现在13个膝盖上，最常见的水平卵裂（54%）。五个盘状内侧半月板不稳定（23％）：3个为后部撕裂，2个为边缘功能不全。所有22个膝盖都接受了关节镜检查，在13个撕裂的半月板中，7(54%)被修复。中位随访时间为24个月(范围，2-82个月）。四个膝盖接受了再次手术。所有需要再次手术的膝盖都接受了后部撕裂的修复。手术修复与需要再次手术之间存在显着关联（P=.0048）。在盘状外侧半月板的病例系列患者中，周围不稳定的发生率也很高。
UNASSIGNED：盘状内侧半月板患者的患者表现和治疗与盘状外侧半月板患者的报道相似。盘状内侧半月板的膝盖也表现出不稳定，归因于周围功能不全和后部撕裂。泪液出现在半数以上的膝盖盘状内侧半月板，再次手术在接受眼泪修复的膝盖中比没有修复的膝盖更常见。
UNASSIGNED：我们的目的是报告来自北美多个中心的儿童盘状内侧半月板的临床表现和手术治疗。我们假设症状和体征，关节镜检查结果，手术治疗,结果与有症状的盘状外侧半月板相似。
未经批准：案例系列；证据级别，4.
UNASSIGNED：一项回顾性研究确定了2000年1月至2021年6月间在8家儿童医院手术中确诊的盘状内侧半月板患者。对有关盘状外侧半月板的文献进行了回顾和总结，以进行比较。
未经批准：共有21名患者（9名女性，确定了12名男性）和22个盘状内侧半月板。诊断时的平均±SD年龄为12.8±3.8岁。最常见的症状和体征是锁定和/或碰撞，出现在22个膝盖中的12个（55％），与盘状外侧半月板患者的报道相似。12个盘状内侧半月板完整（55％）；8，不完整（36％）；2，不确定（9％）。眼泪出现在13个膝盖上，最常见的水平卵裂（54%）。五个盘状内侧半月板不稳定（23％）：3个为后部撕裂，2个为边缘功能不全。所有22个膝盖都接受了关节镜检查，在13个撕裂的半月板中，7(54%)被修复。中位随访时间为24个月(范围，2-82个月）。四个膝盖接受了再次手术。所有需要再次手术的膝盖都接受了后部撕裂的修复。手术修复与需要再次手术之间存在显着关联（P=.0048）。在盘状外侧半月板的病例系列患者中，周围不稳定的发生率也很高。
UNASSIGNED：盘状内侧半月板患者的患者表现和治疗与盘状外侧半月板患者的报道相似。盘状内侧半月板的膝盖也表现出不稳定，归因于周围功能不全和后部撕裂。泪液出现在半数以上的膝盖盘状内侧半月板，再次手术在接受眼泪修复的膝盖中比没有修复的膝盖更常见。
