specifically怎么理解？

Despite an adequate trial of conservative therapy, some patients will continue to experience an unacceptable level of pain. Patients can choose to avoid activities that elicit pain or opt for surgical intervention. Patients with degenerative disc disease who may benefit from surgical intervention are those specifically with disc herniation or degenerative spinal stenosis [6, 7]. Surgery should likely be reserved for patients with severe pain limiting daily activity, neurologic deficits including lower extremity weakness, or spondylolisthesis. The Spine Patient Outcomes Research Trial (SPORT) compared conservative versus surgical management of lumbar disc herniation and spinal canal stenosis. For patients with lumbar disc herniation who underwent discectomy versus medical management, improvements after 3 months in measures of bodily pain, physical function, and Oswestry Disability Index (ODI) were greater with discectomy [16]. However, after 2 years, these differences narrowed and were not statistically significant.

尽管充分尝试保守治疗，但仍有某些患者无法有效缓解疼痛。患者可以选择避免引起疼痛的活动或手术干预。可能从手术干预中获益的腰椎退行性疾病特指腰椎间盘突出症和腰椎管狭窄症^{[6, 7]}。因严重疼痛而限制日常活动、神经功能缺陷（包括下肢无力）或脊柱滑脱时，可能有手术适应征。脊柱患者预后研究试验 (Spine Patient Outcomes Research Trial，SPORT) 比较了腰椎间盘突出症和椎管狭窄症患者的保守与手术治疗。与药物治疗相比，3个月后，椎间盘切除术在疼痛、身体功能和 Oswestry 残疾指数 (Oswestry Disability Index，ODI) 方面的改善更明显^[16]。然而，2 年后，这些差异缩小且没有统计学意义。

specifically怎么理解？谢谢