Abstract:

BACKGROUND: The mismatch of resected surface and imported tibial baseplate usually occurs in operation of total knee arthroplasty (TKA). The mainly reason, except surgical technology, is the difference of morphology of resected surface in Chinese population and imported knee prostheses designed according to western population.
OBJECTIVE: To analyze features of resected surface in TKA by anthropometric measurements of proximal tibia on the level of resected surface of Chinese knees.
METHODS: A total of 90 adults who had disorders in monolateral keens were selected and divided into 151-160 cm, 161-170 cm, and 171-180 cm according to different height. The normal knee of each patient was scanned by CT. The three-dimensional solid models of normal knees were reconstructed by standard mode on CT work station. Anthropometric measurements of several parameters (anteroposterior (AP) and mediolateral (ML) dimension of resected surface, AP/ML ratio of resected surface, AP and ML dimension of medial and lateral resected surface) were performed. The correlations of the parameters were analyzed, and the data of tibial resected surface with several commonly imported tibial baseplates of total knee prosthesis were compared.
RESULTS AND CONCLUSION: With increasing height, the AP and ML dimension increased and AP/ML ratio decreased. The AP dimension of resected surface was correlated positively with ML dimension of resected surface, and AP/ML ratio of resected surface showed negative correlation with ML dimension of resected surface. The AP/ML ratio of proximal tibial resected surface of Chinese population was greater than those of several commonly imported tibial baseplates of total knee prosthesis. The morphogy of resected surface of proximal tibia has obvious features. The AP/ML ratio should be appropriately raised while designing the tibial baseplates of total knee prosthesis for Chinese population.