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Journal of Bone and Joint Surgery - British Volume, Vol 90-B, Issue 7, 870-873.
doi: 10.1302/0301-620X.90B7.20111  
Copyright © 2008 by British Editorial Society of Bone and Joint Surgery
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The effect of quadriceps contraction during weight-bearing on four patellar height indices

C. K. Yiannakopoulos, MD, Orthopaedic Surgeon1; E. Mataragas, MD, Resident in Orthopaedic Surgery1; and E. Antonogiannakis, MD, Orthopaedic Surgeon1

1 IASO General Hospital, Mesoghion Ave. 264, Athens, Greece.

Correspondence should be sent to Dr C. K. Yiannakopoulos; e-mail: cky{at}ath.forthnet.gr

The effect of weight-bearing on the height of the patellar using four radiological indices was studied in 25 healthy men using lateral radiographs of the knee in 30° of flexion non-weight-bearing and weight-bearing. The position of the patella was quantified using the Insall-Salvati, the modified Insall-Salvati, the Blackburne-Peel and the Caton indices. The contraction of the quadriceps on weight-bearing resulted in statistically significant proximal displacement of the patella with all four indices studied. The mean Insall-Salvati index was 0.919 (SD 0.063) before and 1.109 (SD 0.042) after weight-bearing (p = 0.001), while the mean modified Insall-Salvati index was 0.734 (SD 0.039) before and 0.896 (SD 0.029) after weight-bearing (p = 0.041). Similarly, the Blackburne-Peel index was 0.691 (SD 0.09) before and 0.807 (SD 0.137) after weight-bearing (p = 0.012). The mean Caton index was 0.861 (SD 0.09) before and 0.976 (SD 0.144) after weight-bearing (p = 0.023).

The effect of quadriceps contraction should be considered in clinical studies where the patellar position indices are reported.




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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General