Overview
Scapulohumeral periarthritis (SP), also referred to as scapulohumeral spinal muscular atrophy in some contexts, is a chronic inflammatory condition characterized by degeneration and strain affecting the muscles, ligaments, tendons, and joint capsules around the shoulder. It predominantly impacts middle-aged and elderly individuals, with a higher incidence in women 1. The primary clinical manifestations include shoulder pain, which can range from intermittent to persistent and severe, often worsening at night, and limitations in shoulder mobility, sometimes accompanied by muscle atrophy 13. Given its significant impact on mobility and quality of life, including potential psychological effects like anxiety and insomnia, effective management is crucial in day-to-day clinical practice to alleviate suffering and improve functional outcomes [10–12].Pathophysiology
The pathophysiology of scapulohumeral periarthritis involves chronic inflammation and degenerative changes in the soft tissues surrounding the shoulder joint. Degeneration of muscle fibers and connective tissues leads to microtrauma and increased local inflammation, characterized by elevated levels of inflammatory mediators such as PGE2 and cytokines like TNF-α and IL-6 1. This inflammatory milieu contributes to pain and reduced joint mobility. Additionally, the strain on surrounding structures can result in ligamentous laxity and joint instability, further exacerbating symptoms 1. The chronic nature of the condition often leads to compensatory muscle atrophy, particularly in the deltoid muscle, as the body attempts to adapt to the altered mechanics 9.Epidemiology
Scapulohumeral periarthritis has an incidence ranging from 2% to 5%, constituting approximately 42% of shoulder diseases [1–4]. It predominantly affects middle-aged and elderly populations, with a noted trend towards younger onset in recent years 1. Gender distribution shows a higher prevalence in women compared to men 15. Geographic and specific risk factors are less defined in the provided literature, though lifestyle factors and repetitive strain injuries may play roles in its development 1. Trends indicate an increasing incidence, possibly linked to aging populations and changes in occupational demands 1.Clinical Presentation
Patients with scapulohumeral periarthritis typically present with chronic shoulder pain that can be intermittent initially but progresses to persistent and severe discomfort, particularly at night 13. This pain often correlates with limitations in shoulder movement, including abduction, flexion, and external rotation 38. Atypical presentations may include referred pain patterns or less pronounced muscle atrophy 9. Red-flag features include significant weight loss, unexplained fever, or rapid progression of symptoms, which may warrant further investigation for other underlying conditions 1.Diagnosis
The diagnosis of scapulohumeral periarthritis involves a comprehensive clinical evaluation supported by imaging and sometimes laboratory tests. Key diagnostic criteria include:Differential Diagnosis:
Management
First-Line Treatment
Second-Line Treatment
Refractory Cases / Specialist Escalation
Complications
Prognosis & Follow-Up
The prognosis for scapulohumeral periarthritis varies, with many patients experiencing significant improvement with appropriate management. Prognostic indicators include early intervention, adherence to physical therapy, and control of inflammation. Recommended follow-up intervals typically include:Special Populations
Key Recommendations
References
1 Gao M, Cong H, Li C, Qin X, An H, Jiang Z. Comparison of efficacy and safety of complementary and alternative therapies for scapulohumeral periarthritis: A protocol for Bayesian network meta-analysis. Medicine 2021. link 2 Vayalapra S, Guerero DN, Sandhu V, Happy AA, Imantalab D, Kissoonsingh P et al.. Comparing the Safety and Efficacy of Superficial Musculoaponeurotic System and Deep Plane Facelift Techniques: A Systematic Review and Meta-analysis. Annals of plastic surgery 2025. link 3 Corona BT, Greising SM. Challenges to acellular biological scaffold mediated skeletal muscle tissue regeneration. Biomaterials 2016. link 4 Kofler J, Eberspächer E, Fischl K, Vidoni B. Surgical treatment of scapulohumeral subluxation in an alpaca (Vicugna pacos) using osteotomy of the acromion, open reduction and extracapsular tension sutures. New Zealand veterinary journal 2016. link 5 Ellis DA, Shemen LJ. Use of the fascial plane system in the facelift operation. The Journal of otolaryngology 1981. link 6 Rees TD, Aston SJ. A clinical evaluation of the results of submusculo-aponeurotic dissection and fixation in face lifts. Plastic and reconstructive surgery 1977. link