trauma fracture taiwan orthopedics china medical university hospital ankle taichung tsai chun-hao total hip arthroplasty syndesmosis orthopedic atypical fracture bisphosphonate osteoporosis periprosthetic fracture minimally invasive surgery sacrum pelvic posterior malleous volkmann fragment chaput fragment antigldeing plate incisura fibularis pilon pilonn map pilon column locking plate revision knee arthroplasty allograft periprosthetic unified classification ao/ota
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