求翻译：从48例获得随访的肘关节僵硬患者中分别随机选取出22例曾接受关节镜下松解术及22例曾接受开放式松解术的患者，进行回顾性研究。是什么意思？

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Legislation has been accompanying the 48 from the elbow joint stiffness in patients with a randomly chosen respectively had accepted 22 laws mirror the joints and ease regulations had accepted 22 open ease of surgery patients, retrospective studies.

In the elbow joint stiff patient's obtains the revisit who from 48 examples distinguished to select 22 examples once to accept the patient stochastically who under the arthroscope the lysis and 22 examples once accepted the open style lysis, conducted the review research.

Obtained from 48 cases of elbow stiffness in the follow-up of patients, respectively, randomly selected out of the 22 patients who have undergone Arthroscopic Lysis and 22 patients received open lysis of patients, for retrospective studies.

From 48 patients were followed up in patients with elbow stiffness were randomly selected out of 22 cases had received arthroscopic lysis and 22 patients had received open-lysis patients were studied retrospectively.