Process evaluation of an individually tailored complex intervention to improve activities and participation of older nursing home residents with joint contractures (JointConEval): a mixed-methods study.

Background: Older people with joint contractures in nursing homes often experience severe restrictions in their activities and participation. The effectiveness of an individually tailored complex intervention to improve residents' activities and participation by incorporating the biopsychosocial perspective into nursing care using a structured facilitator approach could not be established in the JointConEval cluster-randomised controlled trial. This process evaluation aimed to systematically identify factors influencing implementation and effectiveness.

Methods: The mixed-methods process evaluation analysed recruitment, implementation, mechanisms of impact, and context. Qualitative data was generated in semi-structured focus groups and in individual interviews with facilitators, nursing and social care staff, residents, relatives and guardians. Quantitative data was recorded with facilitators and 20% of nursing and social care staff using standardised documentation forms and questionnaires. Qualitative data was analysed using qualitative thematic content analysis, while the quantitative data was analysed descriptively. An interpretation was performed by combining and comparing the qualitative and quantitative results after the separate analyses.

Results: The implementation was realised as planned, but the intervention did not always reach the nursing home staff, which hindered the planned change in attitude and behaviour. The attitude of the facilitators was mainly in line with the intervention. However, the intervention reached only half the residents. We identified various key influencing factors related to the context, setting and implementation agents. Nursing homes lacking facilitator support from staff or management or experiencing staff shortages and facing organisational weaknesses had difficulties in achieving the desired behavioural changes and positive primary outcomes.

Conclusions: The complex intervention was delivered as planned with several factors affecting the implementation. A key influencing factor was the organisational structure and leadership of the nursing homes, which had an impact on the behaviour and motivation of the implementation agents. The findings highlight challenges in achieving behavioural changes among nursing staff in the context of long-term care in Germany. We recommend a systematic organisational context analysis for similar complex interventions in long-term care, involving stakeholders and improving leadership participation for more effective implementation.

Trial registration: DRKS (German Clinical Trials Register), number DRKS00015185. Registered on 1 August 2018, https://drks.de/search/en/trial/DRKS00015185 . Universal Trial Number U1111-1218-1555.