ＭＧ　ＩＩ型ＴＫＡ後の階段昇降能と後方動揺性との関連性に関する検討

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  • A Study of the Relationship between Stair-Climbing and Posterior Laxity of the Knee after MG II Total Knee Arthroplasty

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A study of the relationship between stair-climbing and posterior laxity of knee was performed in 37 patients with osteoarthritis after 44 MG II total knee arthroplasties. Evaluation of ascending and descending stairs was performed using gentle stairs (16 cm-high) and steep stairs (first step : 34-cm high, second step : 23 cm-high) whose heights were the same as two-step bus stairs. Lateral radiograph at 90 degrees of the involved knee in the spine position was taken. The tibilfemoral contact point was identified on the radiograph. The distance from the posterior edge of the tibial component to the tibiofemoral contact point was measured and expressed as a percentage of the total width of the tibial component. The contact-point ratio was used to quantify the posterior laxity. The percentage of patients capable of ascending and descending the gentle stairs and steep stairs in the manner of one foot / stair was 57 and 27 % respectively. The main reason for inability to ascend/descend the gentle and steep stairs in a reciprocal manner was muscle weakness and a resultant feeling of insecurity. The manner of going up and down the gentle and steep stairs was related to the posterior laxity of the knee.

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