Trail-running After Knee or Hip Arthroplasty

The incidence of indications for hip and knee arthroplasty is constantly increasing due to an increase in arthrogenic risk factors and life expectancy. Projections predict an increase in the number of prosthetic surgeries between 2020 and 2030 of 150% for total hip replacements (THR) and 230% for total knee replacements (TKR). In younger patients, with a higher functional demand, resumption of physical activity and sport is a major objective after resumption of walking and pain management. They are also more likely to resume physical activities with high peak joint stresses, known as "high-impact sports", most often against the advice of their surgeon. The repercussions of returning to sports after arthroplasty have been widely studied in the literature. These are essentially descriptive cross-sectional studies which show greater participation in low or medium impact sports activities in patients with prostheses. Few studies have looked specifically at high-impact activities, the possibility of resuming sport and its consequences. The recommendations are essentially based on expert opinion. Concerning trail running, a discipline in full expansion, particularly in the longest formats; a single study in 2019, involving 18 runners with a prosthesis, did not reveal any specific constraints compared to healthy runners during a 170 km ultratrail.