Abstract

Shoulder arthroplasty is increasing in incidence over time. One potential complication that is not well studied following shoulder arthroplasty is heterotopic ossification (HO), the abnormal growth of extraskeletal bone in soft tissue. HO has been described as a complication in total hip arthroplasty literature but less described in the setting of shoulder arthroplasty. The aim of this systematic review is to present available evidence regarding the incidence, risk factors, and potential management of HO after shoulder arthroplasty. A systematic search was conducted in June 2023 using Pubmed, Embase, and Ovid Medline databases to retrieve all relevant studies evaluating the occurrence of HO after shoulder arthroplasty. The search was done in duplicate, and a quality assessment of all studies was included. A total of 170 studies were retrieved, of which 6 were included, involving 1,028 patients undergoing shoulder arthroplasty with 1,038 operated shoulders. HO developed postoperatively in 28% of the included shoulders and was symptomatic in 12% with most cases occurring in shoulders that developed osteoarthritis and cuff tear arthropathy. Men appear to have an increased risk of developing HO post shoulder arthroplasty. Fewer than 2% of HO shoulders went on to have revision surgery, and no notable differences were observed in the postoperative mean elevation and external rotation angles of non-HO and HO shoulders. In addition, no reported benefit of the use of nonsteroidal anti-inflammatory drugs was found against the formation of HO after shoulder arthroplasty. HO occurs in 28% of shoulder arthroplasties in our review. Most of these were asymptomatic in the reviewed articles. Male patients and revision surgery with osteoarthritis and cuff tear arthroplasty seem to be at higher risk of developing HO post shoulder arthroplasty. Nonsteroidal anti-inflammatory drugs seem to not prevent the development of HO after shoulder arthroplasty; yet, future studies are needed to verify this claim. Level III; Systematic Review.

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