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ORIGINAL ARTICLE
Year : 2021  |  Volume : 12  |  Issue : 1  |  Page : 115

Non-adherence to pain medication increases risk of postoperative frozen shoulder


1 Department of Orthopedic Surgery, Kantonsspital Baden, Im Ergel 1, Baden, Switzerland
2 Department of Orthopedic Surgery, Kantonsspital Aarau, Tellstrasse 25, Aarau, Switzerland
3 Department of Orthopedic Surgery, Spital Bülach, Bülach, Switzerland

Correspondence Address:
Richard Niehaus
Kantonsspital Baden
Switzerland
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijpvm.IJPVM_499_20

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Background: Postoperative frozen shoulder (FS) or adhesive capsulitis is a relatively frequent complication (5-20%), even after simple arthroscopic shoulder surgeries. The pathophysiology is still unclear, but psychological factors may play a pivotal role. From clinical experience, we hypothesized that patients, who are reluctant to take medications, particularly “pain-killers,” have an increased incidence of postoperative FS. Methods: We identified twenty patients who underwent limited arthroscopic operations of the shoulder and developed postoperative FS. Twenty patients with matching type of surgery, age, and gender served as control group (n = 20). All patients were at least one year postoperative and asymptomatic at the time of examination. Demographic data, the patient's adherence to self-medication (including self-medicating scale, SMS), development the Quality of life (QoL), and depression scale (PHQ-4-questionnaire) were assessed. Results: Patients with FS had a 2-fold longer rehabilitation and 3-fold longer work inability compared to the patients without FS (P < 0.009 and P < 0.003, respectively). Subjective shoulder value SSV (P = 0.075) and post-operative improvement of QoL (P = 0.292) did not differ among the groups. There was a trend—but not significant—toward less coherence to self-medication in the FS-group (26.50 vs. 29.50; P = 0.094). Patients with postoperative FS significantly more often stated not to have “taken pain-killers as prescribed” (P = 0.003). Conclusions: Patients reporting unwillingness to take the prescribed pain medications had a significantly higher incidence of postoperative FS. It remains unclear whether the increased risk of developing FS is due to reduced postoperative analgesia or a critical attitude toward taking medication. However, patients who are reluctant to take painkillers should strongly be encouraged to take medications as prescribed.


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