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The SPECT/CT Evaluation of Compartmental Changes after Open Wedge High Tibial Osteotomy

View Article: PubMed Central - PubMed

ABSTRACT

Purpose: The purpose of this study was to evaluate compartmental changes using combined single-photon emission computerized tomography and conventional computerized tomography (SPECT/CT) after open wedge high tibial osteotomy (OWHTO) for providing clinical guidance for proper correction.

Materials and methods: Analysis was performed using SPECT/CT from around 1 year after surgery on 22 patients who underwent OWHTO. Postoperative mechanical axis was measured and classified into 3 groups: group I (varus), group II (0°–3° valgus), and group III (>3° valgus). Patella location was evaluated using Blackburne-Peel (BP) ratio. On SPECT/CT, the knee joint was divided into medial, lateral, and patellofemoral compartments and the brighter signal was marked as a positive signal.

Results: Increased signal activity in the medial compartment was observed in 12 cases. No correlation was observed between postoperative mechanical axis and medial signal increase. Lateral increased signal activity was observed in 3 cases, and as valgus degree increased, lateral compartment’s signal activity increased. Increased signal activity of the patellofemoral joint was observed in 7 cases, and significant correlation was observed between changes in BP ratio and increased signal activity.

Conclusions: For the treatment of medial osteoarthritis, OWHTO requires overcorrection that does not exceed 3 valgus. In addition, the possibility of a patellofemoral joint problem after OWHTO should be kept in mind.

No MeSH data available.


Related in: MedlinePlus

Preoperative (A) and postoperative (B) measurements and changes in the mechanical axis on full-length lower extremity scanogram (pre-operative mechanical axis, 3.21° varus; postoperative mechanical axis, 3.38° valgus).
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f1-ksrr-28-263: Preoperative (A) and postoperative (B) measurements and changes in the mechanical axis on full-length lower extremity scanogram (pre-operative mechanical axis, 3.21° varus; postoperative mechanical axis, 3.38° valgus).

Mentions: In the current study, the mechanical axis at the time of SPECT/CT imaging was used as the criterion for group classification (Fig. 1).


The SPECT/CT Evaluation of Compartmental Changes after Open Wedge High Tibial Osteotomy
Preoperative (A) and postoperative (B) measurements and changes in the mechanical axis on full-length lower extremity scanogram (pre-operative mechanical axis, 3.21° varus; postoperative mechanical axis, 3.38° valgus).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5134792&req=5

f1-ksrr-28-263: Preoperative (A) and postoperative (B) measurements and changes in the mechanical axis on full-length lower extremity scanogram (pre-operative mechanical axis, 3.21° varus; postoperative mechanical axis, 3.38° valgus).
Mentions: In the current study, the mechanical axis at the time of SPECT/CT imaging was used as the criterion for group classification (Fig. 1).

View Article: PubMed Central - PubMed

ABSTRACT

Purpose: The purpose of this study was to evaluate compartmental changes using combined single-photon emission computerized tomography and conventional computerized tomography (SPECT/CT) after open wedge high tibial osteotomy (OWHTO) for providing clinical guidance for proper correction.

Materials and methods: Analysis was performed using SPECT/CT from around 1 year after surgery on 22 patients who underwent OWHTO. Postoperative mechanical axis was measured and classified into 3 groups: group I (varus), group II (0°–3° valgus), and group III (>3° valgus). Patella location was evaluated using Blackburne-Peel (BP) ratio. On SPECT/CT, the knee joint was divided into medial, lateral, and patellofemoral compartments and the brighter signal was marked as a positive signal.

Results: Increased signal activity in the medial compartment was observed in 12 cases. No correlation was observed between postoperative mechanical axis and medial signal increase. Lateral increased signal activity was observed in 3 cases, and as valgus degree increased, lateral compartment’s signal activity increased. Increased signal activity of the patellofemoral joint was observed in 7 cases, and significant correlation was observed between changes in BP ratio and increased signal activity.

Conclusions: For the treatment of medial osteoarthritis, OWHTO requires overcorrection that does not exceed 3 valgus. In addition, the possibility of a patellofemoral joint problem after OWHTO should be kept in mind.

No MeSH data available.


Related in: MedlinePlus