PURPOSE The primary objective was to compare the functional outcomes after an isolated MPFL reconstruction using either a quasi-anatomical technique (group A) or an anatomical MPFL reconstruction (group B). The secondary objectives were to compare the rates of redislocation, range-of-motion and subjective patellar instability (Smillie test). METHODS A multicenter longitudinal prospective comparative study was performed. Group A had 29 patients and 28 were included in Group B. Patients with trochlear dysplasia types C and D and patients who had undergone a trochleoplasty, a distal realignment or patella distalization concurrently with MPFL reconstruction were excluded. The main evaluation criterion was the Kujala functional score. RESULTS The mean postoperative Kujala was 90.4 (89.4 in group A and 92.1 in group B). Upon comparing the mean difference between pre- and post-operative values, no differences were detected between the two groups (n.s). CONCLUSIONS Isolated quasi-anatomical MPFL reconstruction using a gracilis tendon autograft for recurrent patellar dislocation provides outcomes as good as the isolated anatomical MPFL reconstruction in patients with no trochlear dysplasia up to those with trochlear dysplasia type A and B at the 2-5 years follow-up. LEVEL OF EVIDENCE Level IV.

中文翻译：

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股骨内侧韧带经弹性股骨固定的孤立重建可产生出色的临床效果。

目的主要目的是比较采用准解剖技术（A组）或解剖MPFL重建（B组）的孤立MPFL重建后的功能结果。次要目标是比较再分配，活动范围和主观pa骨不稳的发生率（Smillie检验）。方法进行了多中心纵向前瞻性比较研究。A组有29例患者，B组包括28例。排除了具有C和D型滑车不典型增生的患者以及进行了滑车成形术，远端复位或骨远端化并同时进行MPFL重建的患者。主要的评估标准是Kujala功能评分。结果术后平均Kujala为90.4（A组为89.4，B组为92.1）。比较术前和术后值的平均差异后，两组之间均未发现差异（ns）。结论使用gra肌腱自体移植治疗孤立的准解剖性MPFL对于复发性pa骨脱位，在随访2-5年内，对于无滑车不典型增生的患者，直到A和B滑车不典型增生的患者，其结果均优于单纯的解剖MPFL重建。向上。证据级别IV。结论使用gra肌腱自体移植治疗孤立的准解剖性MPFL对于复发性pa骨脱位，在随访2-5年内，对于无滑车不典型增生的患者，直到A和B滑车不典型增生的患者，其结果均优于单纯的解剖MPFL重建。向上。证据级别IV。结论使用gra肌腱自体移植治疗孤立的准解剖性MPFL对于复发性pa骨脱位，在随访2-5年内，对于无滑车不典型增生的患者，直到A和B滑车不典型增生的患者，其结果均优于单纯的解剖MPFL重建。向上。证据级别IV。