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- Title
Is tibial tuberosity-trochlear groove distance an appropriate measure for the identification of knees with patellar instability?
- Authors
Caplan, N.; Lees, D.; Newby, M.; Ewen, A.; Jackson, R.; St Clair Gibson, A.; Kader, D.
- Abstract
Purpose: Tibial tuberosity-trochlear groove distance (TT-TG) has been regarded as a useful tool for establishing therapeutic choices for patellar instability. Recently, it has been shown that TT-TG negatively correlated with the quadriceps angle, suggesting that if used individually, neither provide a valid measure of instability. This study aimed to compare TT-TG distance between both knees in patients with unilateral instability to assess whether this measurement is a decisive element in the management decisions for patellar instability. Methods: Sixty-two patients (18 male and 44 female), reporting to a specialist patella clinic for recurrent unilateral patellar instability, were included in the study. Patients underwent bilateral long leg computed tomography scan to determine TT-TG distance in both knees. Tibial TT-TG in symptomatic and asymptomatic knees in the same individual was compared statistically. Results: Mean TT-TG distance in the symptomatic knee was 16.9 (±4.9) mm, compared to 15.6 (±5.6) mm in the asymptomatic knee. Tibial TT-TG was not significantly different between stable and unstable knees (n.s.). Conclusions: The lack of difference in TT-TG distance between stable and unstable knees suggests that TT-TG distance alone may not be a decisive element in establishing therapeutic choices for patellar instability. It should, therefore, be interpreted with caution during clinical evaluations. Level of evidence: II.
- Subjects
PATELLA diseases; JOINT hypermobility; PATELLOFEMORAL joint diseases; PATELLA dislocation; OSGOOD-Schlatter disease
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2014, Vol 22, Issue 10, p2377
- ISSN
0942-2056
- Publication type
Article
- DOI
10.1007/s00167-014-2954-0