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