Assessment of Loading History of Compartments in the Knee Using Bone SPECT/CT: A Study Combining Alignment and 99mTc-HDP Tracer Uptake/Distribution Patterns

作者：Hirschmann Michael T^*; Schoen Stephan; Afifi Faik K; Amsler Felix; Rasch Helmut; Friederich Niklaus F; Arnold Markus P

来源：Journal of Orthopaedic Research, 2013, 31(2): 268-274.

DOI：10.1002/jor.22206

• SPECT/CT
• knee
• mechanical alignment
• loading
• tracer uptake analysis

This study investigates if the mechanical/anatomical alignment influences the intensity values as well as the distribution pattern of SPECT/CT tracer uptake. Eighty-five knees (mean age 48 +/- 16) undergoing 99mTc-HDP-SPECT/CT due to pain were prospectively included. SPECT/CTs were analyzed using a previously validated localization method. The maximum intensities in each femoral, tibial, and patellar joint compartment (medial, lateral, central, superior, and inferior) were noted using a color-coded grading scale (0-10). The Kellgren-Lawrence osteoarthritis score (KL) was assessed on standardized radiographs. Long leg radiographs were used to assess the mechanical/anatomical leg alignment, which was classified as varus, valgus, or neutral. The alignment and KL was correlated with the intensity of tracer uptake in each area of interest (p < 0.05). The intensity of SPECT/CT tracer uptake in the medial and lateral knee compartment significantly correlated with varus or valgus alignment of the knee. A higher degree of osteoarthritis was significantly related to higher tracer uptake in the corresponding joint compartments. SPECT/CT reflects the specific loading pattern of the knee with regard to its alignment. It is also related to the degree of osteoarthritis. Hence, SPECT/CT should be considered for follow-up of patients after realignment treatments, osteotomies, deloader devices, or insoles.

• 出版日期2013-2