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Knee Surg Sports Traumatol Arthrosc. 2017 Aug;25(8):2352-2356. doi: 10.1007/s00167-015-3716-3. Epub 2015 Jul 28.

Primary patellar dislocations without surgical stabilization or recurrence: how well are these patients really doing?

Author information

1
Department of Orthopaedics, Sports Health and Performance Institute, The Ohio State University, Columbus, OH, 43214, USA. robert.magnussen@gmail.com.
2
Sports Health and Performance Institute, The Ohio State University, Columbus, OH, USA. robert.magnussen@gmail.com.
3
Department of Orthopaedics, Sports Health and Performance Institute, The Ohio State University, Columbus, OH, 43214, USA.
4
Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, MN, USA.
5
Sports Health and Performance Institute, The Ohio State University, Columbus, OH, USA.
6
TRIA Orthopaedic Center, Bloomington, MN, USA.

Abstract

PURPOSE:

While a significant research has gone into identifying patients at highest risk of recurrence following primary patellar dislocation, there has been little work exploring the outcomes of patients who do not have a recurrent patellar dislocation. We hypothesize that patients without recurrent dislocation episodes will exhibit significantly higher KOOSs than those who suffer recurrent dislocations, but lower scores than published age-matched normative data.

METHODS:

A retrospective review of patients with nonoperatively treated primary lateral patellar dislocations was carried out, and patients were contacted at a mean of 3.4 years (range 1.3-5.5 years) post-injury. Information regarding subsequent treatment and recurrent dislocations along with patient-reported outcome scores and activity level was collected.

RESULTS:

One hundred and eleven patients (29.8 %) of 373 eligible patients agreed to study participation, seven of whom were excluded because they underwent subsequent patellar stabilization surgery on the index knee. Seventy-six patients (73.1 %) reported no further dislocation events, and the mean KOOS subscales at follow-up were: symptoms-80.2 ± 18.8, pain-81.8 ± 16.2, ADL-88.7 ± 15.9, sport/recreation-72.1 ± 24.4, and QOL-63.9 ± 23.8 at a mean follow-up of 3.3 years (range 1.3-5.5 years). No significant differences in any of the KOOS subscales were noted between these patients and the group that reported recurrent patellar dislocations. Only 26.4 % of the patients without further dislocations reported they were able to return to desired sport activities without limitations following their dislocation.

CONCLUSION:

Patients who do not report recurrent patellar dislocations following nonoperative treatment of primary patellar dislocations are in many cases limited by this injury 3 years following the initial dislocation event.

LEVEL OF EVIDENCE:

Retrospective cohort study, Level III.

KEYWORDS:

Nonoperative; Patellar instability; Patient-reported outcomes

PMID:
26215775
DOI:
10.1007/s00167-015-3716-3
[Indexed for MEDLINE]

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