PLUS-M Mobility Values of Osseointegration Patients: How do Osseointegration Limb Replacement Prosthesis Users Compare to Traditional Socket Amputee Prosthesis Users?

Abstract

Objective: The primary aim of this study was to compare osseointegration limb replacement prosthesis users (OI-LRPU) to normative published PLUS-M values for traditional socket prosthesis users (TSPU). The secondary aim was to investigate whether patient factors were predictive of PLUS-M scores.

Design: Retrospective review of all patients who underwent OI maintained in a prospectively maintained registry. All patients (N = 63) were invited to complete a PLUS-M survey. 30 patients completed the survey (15 femoral OI, 15 tibial OI).

Results: The OI-LRPU cohort's composite median scores and inter-quartile ranges for the PLUS-M Raw Score, PLUS-M T-score, and PLUS-M percentile score were 57 (46-60), T-score 62.5 (51.275 - 71.4) and 89.5 (54.95 - 98.4). PLUS-M T-scores were higher in the OI-LRPU compared with the age and etiology matched literature-reported outcomes in TSPU for above-knee (p = 0.027) and below-knee (p = 0.029) amputees. Tibial OI scores were slightly higher than femur OI scores but did not reach statistical significance. PLUS-M raw (p = 0.047) and PLUS-M percentile scores (p = 0.041) were significantly improved for younger patients at the time index amputation. Regression analysis supported this finding.

Conclusions: OI-LRPU demonstrate improved functional mobility outcome scores relative to TSPU. PLUS-M functional scores were improved for younger patients at time of index amputation.