The Mobile Constant, a Self-Reported Method for Shoulder Function Evaluation: Development and Validation Study

Jingyuan Fan   ^{1 *} , MD ;   Tao Zhang   ^{2 *} , BMed ;   Fanbin Gu   ¹ , MD ;   Zhaoyang Wang   ¹ , MD ;   Chengfeng Cai   ³ , MM ;   Honggang Wang   ^{1, 4, 5} , MD ;   Xiaolin Liu   ^{1, 4, 5} , MD ;   Jiantao Yang   ^{1, 4, 5} , MD ;   Jian Qi   ^{1, 4, 5} , MD ;   Qingtang Zhu   ^{1, 4, 5} , MD

¹ Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China

² Department of Rehabilitation Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China

³ Department of Hand and Foot Rehabilitation, Guangdong Provincial Work Injury Rehabilitation Hospital, Guangzhou, China

⁴ Guangdong Province Engineering Laboratory for Soft Tissue Biofabrication, Guangzhou, China

⁵ Guangdong Provincial Key Laboratory for Orthopedics and Traumatology, Guangzhou, China

*these authors contributed equally