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Correlation between Arthrometric evaluation of knees using KT 1000 and Telos stress radiography and functional outcome following ACL reconstruction

1997; Elsevier BV; Volume: 4; Issue: 3 Linguagem: Inglês

10.1016/s0968-0160(97)00247-0

1873-5800

N. Hyder, Steve Bollen, Graham K. Sefton, Andrew Swann,

Sports injuries and prevention

Abstract Sixty-two consecutive patients were assessed following ACL reconstruction with the Leeds-Keio prosthesis at a follow-up of up to 6 years after surgery (mean 31.5 months). The purpose of the study was to see if measured side to side difference in anterior laxity at 20° of flexion (Lachman) had any significant correlation with the subjective functional outcome. Using the KT 1000 arthrometer and Telos stress radiography, difference in anterior laxity between operated and non-injured knees was determined. Subjective functional assessment was done using the Cincinnati scoring system and Tegner activity level. Mean operated to non-injured difference in anterior laxity using KT 1000 was 2.49 mm (S.D. ±3.24) and mean operated to non-injured difference using Telos equipment was 2.77 mm (S.D. ±3.12). Overall there was a significant improvement in the Cincinnati scores from a mean of 44 ± 17.5 before surgery to a mean of 83 ±13.8 at follow-up. However, the mean Cincinnati score was 83 in those with a differential operated to non-injured anterior laxity of 0–1 mm ( n = 3), 85 in those with laxity of 1–2 mm ( n = 10), 84 in those with laxity of 2–3 mm ( n = 27) and 85 in those with laxity of over 3 mm ( n = 22). Regression coefficient (R) comparing KT-1000 and Cincinnati scores was 0.20 and comparing Telos and Cincinnati scores was 0.15. When Tegner activity level was compared with KT 1000 measurements, the Regression coefficient was 0.12 and when it was compared with Telos measurements, it was 0.12. These figures clearly show that there is no significant correlation between clinical outcome and objective arthrometric measurements. Our study raises questions about the emphasis placed on arthrometric measurements in the follow-up of patients having undergone ACL reconstruction.