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Table 3 Advanced practice physiotherapist diagnostic validity for selected knee disorders compared to the orthopaedic surgeons diagnosis (n=109)

From: Validation of an advanced practice physiotherapy model of care in an orthopaedic outpatient clinic

  Sn [95% CI] Sp [95% CI] PPV [95% CI] NPV [95% CI] LR+[95% CI] LR-[95% CI]
Osteoarthritis 0.95 0.99 0.98 0.97 62.9 0.05
n= 43 [0.85-0.99] [0.92-1.00] [0.88-1.00] [0.90-0.99] [9.0-440.6] [0.01-0.18]
ACL tear 0.96 1.00 0.96 1.00 188.5 0.04
n= 12 [0.72-1.00] [0.95-1.00] [0.72-1.00] [0.95-1.00] [11.9-2998.1] [0.003-0.59]
Meniscal injury 0.90 0.97 0.86 0.98 26.7 0.10
n=20 [0.70-0.97] [0.91-0.99] [0.65-0.95] [0.92-0.99] [8.7-82.0] [0.03-0.39]
PFS 0.86 0.97 0.8 0.98 27.1 0.15
n= 14 [0.60-0.96] [0.91-0.99] [0.55-0.93] [0.93-0.99] [8.7-84.4] [0.04-0.53]
  1. As diagnosed by the orthopaedic surgeon.
  2. ACL = anterior cruciate ligament, PFS=patellofemoral syndrome.
  3. SN= sensitivity, SP=specificity, PPV= positive predictive value, NPV= negative predictive value, LR+ = positive likelihood ratio, LR- = negative likelihood ratio.