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Patellar tendon shortening following patellofemoral joint replacement

  • Ludo A. H. van Engen
  • Ellie B. M. Landman
  • Ydo V. Kleinlugtenbelt
  • Hans-Peter W. van Jonbergen
Original Paper

Abstract

Purpose

Patellar tendon shortening may occur following patellofemoral joint replacement (PFJR). We hypothesized that patellar tendon shortening results in unfavourable patient-reported outcomes (PROs). The aim of this study was to determine the effect of patellar tendon shortening following PFJR on PROs.

Methods

In this substudy of a prospective cohort study, a total of 108 patients with isolated patellofemoral osteoarthritis underwent 124 patellofemoral joint replacements. We measured both patellar tendon length and length of the patella on pre-operative radiographs, and on radiographs acquired at eight weeks and at one year post-operative. More than 10% decrease in patellar tendon length relative to the pre-operative patellar tendon length was defined as patellar tendon shortening. Clinical outcomes were assessed using the knee-specific KOOS questionnaire (Knee Injury and Osteoarthritis Outcome Score). Repeated measures ANOVA was used to analyze for differences in change from baseline KOOS subscales between patients with and patients without patellar tendon shortening.

Results

A complete series of standardized pre-operative, eight weeks and one year post-operative radiographs was available for 87 knees in 82 patients. At eight weeks, 16 of 87 knees (18%) showed patellar tendon length shortening, and 27 of 87 knees (31%) at one year. We found no statistically significant relation between patellar tendon length shortening and change from baseline KOOS subscales at one year follow-up (pain p = 0.29, symptoms p = 0.56, ADL p = 0.23, sport or recreation p = 0.22, knee-related quality of life (QOL) p = 0.15).

Conclusions

Patellar tendon length shortening following PFJR occurs in 31% of knees at one year, and does not result in inferior PROs.

Keywords

Patellar tendon shortening Patellofemoral joint replacement Patient-reported outcomes KOOS 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© SICOT aisbl 2018

Authors and Affiliations

  • Ludo A. H. van Engen
    • 1
  • Ellie B. M. Landman
    • 1
  • Ydo V. Kleinlugtenbelt
    • 1
  • Hans-Peter W. van Jonbergen
    • 1
  1. 1.Department of Orthopedic and Trauma SurgeryDeventer HospitalDeventerThe Netherlands

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