Correlation between Gait Analysis and Clinical Questionnaires in Patients with Spontaneous Osteonecrosis of the Knee

Amit Mor 1 Avi Elbaz 1 Ganit Segal 1 Ronen Debi 2 Omri Lubovsky 2 Gadi Kahn 2 Bezalel Peskin 3 Yiftah Beer 4 Ehud Atoun 2
1Research, AposTherapy Research Group, Herzliya, Israel
2Department of Orthopedic Surgery, Barzliay Medical Center, Ashkelon, Israel
3Department of Orthopedic Surgery, Rambam Health Care Campus, Haifa, Israel
4Department of Orthopedic Surgery, Assaf Harofeh Medical Center, Zerifin, Israel

Purpose: Spontaneous osteonecrosis of the knee (SONK) is usually verified by magnetic resonance imaging (MRI) accompanied by clinical questionnaires to assess the level of pain and functional limitation. There is a lack however, in an objective functional test that will reflect the functional severity of SONK. The purpose of the current study was to examine the correlation between spatiotemporal gait parameters and clinical questionnaires in patients with SONK.

Methods: 28 patients (16 females and 12 males) were included in the analysis. Patients had unilateral SONK of the medial femoral condyle confirmed by MRI. All patients performed a computerized spatiotemporal gait analysis and completed the Western Ontario and McMaster University (WOMAC) Osteoarthritis Index and the Short-Form (SF)-36. Relationships between selected spatiotemporal gait measures and self-assessment questionnaires were assessed by Spearman non-parametric correlations

Results: Significant correlations were found between selected spatiotemporal gait parameters and clinical questionnaires (r ranged between 0.28 and 0.79). Single limb support was the gait measure with the strongest correlation to WOMAC pain (r=0.58), WOMAC function (r=0.56) and SF-35 sub-scales.

Conclusions: Spatiotemporal gait assessment for patients with SONK correlates with the patient`s level of pain and functional limitation there by adding objective information regarding the functional condition of these patients.